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THE NAUTILUS 121(2):76-89, 2007 Page 76 Upper Jurassic Pleurotomariidae (Gastropoda) from soudiwestern Madagascar M. G. Harasewych Steffen Kiel Department of Invertebrate Zoologv Earth Sciences National Museum of Natural Histoiy University of Leeds Smitlisonian Institution Leeds LS2 9JT P.O. Box 37012 UNITED KINGDOM Washington, DC 20013-7012 USA and harasew\'[email protected] Department of Paleobiology National Museum oi Natural Histoiy Smithsonian Institution Washington, DC 20013-7012 USA [email protected] ABSTRACT cxoKed an increasing endemism within the Indo- This paper describes lour new species ol Upper Jurassic Pleu- Madaga.scan faiuial province that was formed as the rotomariidae from southwestern Madagascar: Obornella Tethvs Ocean widened between Laurasia and eastern thompsononim, Bnthrotomnria anncjojfeae, Bathrotomaria bc- Gondwana, and a seaway started to develop between detteae, andLeptoinarin ttikiihasliii. In addition, the previously East and West Gondwana in the latest Jurassic (Titho- described Leptomaria texta Delpey, 1948, is reassigned to the nian) (Hay et al, 1999: Shome et al, 2004). genus Obornella. Comparison of this fauna with that of the The scope ofthe present study is to rexdew the Oxfor- geographicallv pi'o>amal Kutsch region of northwestern India dian (Upper Jurassic) pleurotomariid fauna ofMadagas- reveals it to consist ofrepresentatives ofwide-rangingTeth\an car, describe five species, four of them new, and to re- genera,butalsotoexhibitstrongendeniismattliespeciesle\'el. \iew the relationships and biogeography of diese pleu- rotoiiiariids. INTRODUCTION GEOLOGICAL SETTING A substantial number of well presened LIpper Jurassic Rifting betAveen Africa and Madagascar produced three pleurotomariidgastropods have recentlybeen uncovered large sedimentai-y basins along the west coast of Mada- as a byproduct of commercial mining for ammonites in gascar. Theseare, from Northto South, theAmbilobe (or southwestern Madagascar. Six specimens, representing Diego), Mahajanga (also spelled M:ijunga), and Moron- four species, were kindly made available to us for study dava basins. Sedimentation in this region commenced in by Mr. Chris Takahashi. The pleurotomariids and am- the Carboniferouswiththedepositionofthe Gondwanan monites were dug b\' \illagers from pit quarries near the Karoo sequences and equi\alents. The first marine de- town ofZakaraha, in southwestern Madagascar. posits resulting from the break-up ol the Gondwana su- A survey of the literature on the Mesozoic gastropod percontinent are of Toarcian (late Lower Jurassic) age. fauna of Madagascar (e.g., Delpey, 194S; Collignon, From then on, alternating shallow marine, brackish, and 1949: Collignon, 1959; Kiel, 2006) revealed the majority fluviatile sediments were deposited in these basins. The cjfpleurotomariid species known from Madagascai' to be pleurotomariids described here are from the Morondava ofCretaceous age, with onlya single species, Leptomaria basin, the southernmost of the three basins. Bio- and texta Delpey, 1948, reported from Jurassic strata. Al lithostratigraphie work in this basin is difficult because though the sample available to us is of limited size and outcrops are few, index iossils areoften notavailable, and stratigraphic range, it expands our insight into the Juras- measurable sections are usuallyshort and difficult to cor- sic pleurotomariid fauna of Madagascar. Like the well relate with each other. Consequently, only few litho- documentedJurassicpleurotomariid faunaofthe Kutsch stratigraphieunitshavebeengivenformationnamessofar (also spelled Kachchh) region ofwestern India (Jaitley et (Besairie and Collignon, 1972; Lugeret ;il., 1994; Geiger al, 2000; Das, 2002; Das" et al., 2005), the Madagascar and Schweigert, 2006). fauna reveals Tethyan affinities at the generic level, yet The (juarries thai prcidiieed the speeiiiiens described exhibits eiulcmisni at the species level. Bntli lamias liei'e arc located t<i ihc west (il the town Zakaniha (;ilso M. G. Harasew-Ach ami S. Kiel. 2(11)7 Paee spelled Sakkara), one of them north of the Fiherenana pleurotomariids or other gastropods from these sections, Rh-ei", the other to the south ot it (Figures 1, 2). The the remaining fossil content, their geographic position, fossihferous la\'ers are thin and consist of pink-\ellou' and their litholog)' agrees well with that observed at the iron-oolithic limestones, and are o\erlain h\ grev miid- anmionite quarries \isited bv K. Bandel (pers. comm., stones (K. Bandel. pers. conun.. 2007). The southern 2007). localits'is\en'close, it not identical, with the "Amparani- The ammonite fauna ofthese two localities. especialK' bato section (Mb)" ofGeiger and Schweigert (2006: 99) the presence of Dliosaites cf. primus Collignon, 1959, which was characterized b\' them as "a highK" ibssilifer- suggests a iniddle to upper Argovian (early Oxfordian)' ous iron-oolitic hmestone and sandstone bed with thin age (Collignon, 1959; H. Keupp, pers. comm., 2004). mud-stone interla\ers." AccorthngK". the oolitic lime- The term "Argovian' has been aliandoned due to its in- .stones contain an abundant anmionite launa; the over- c(.)nsistent usage, but largelv falls ^\ithin the I'ange ofthe la\ing mudstones contain nodosariid Foraminifera and Oxfordian (Zeiss, 2003). The sediments considered as ostracods (Geiger and Schweigert. 200fi). The northern 'Argo\aan' by Besairie and Collignon (1972) correlate quarr\^ is geographically close to the "Middle-Upper with those mapped as late Callovian-earl\- Oxfordian by Oxfordian Ankilimena section (XI)" of Geiger and Geigerand Schweigert (2006). Thus, thepleurotomariids Schweigert (2006). This section is characterized bv re- described here are most probablv of Oxfoi'dian (Upper current iron-oolitic hmestones. which contain ammo- Jurassic) ase. nites. rh\iichonelhds, bivalves, belemnites, echinodernis, and wood debris (Geiger and Schweigert, 2006: 103). Although Geiger and Schweigert (2006) did not report SUPRASPECIFIC CLASSIFICATION WITHIN PLEUROTOMARIIDAE The number of genera and subgenera cin-rently recognized within the familv Pleurotomariidae (Appendix I) has nearly doubled since the familv was review'ed in the Treatise ofInveftcbratc Zooloî/ (Knight et al., I960). Of the 21 genera and subgenera nowrecognized (Figure 3), 16 are Mesozoic. Ofthese, five are restricted to the Tri- assic, three to the Jiu"assic, and onh' a single subgenus to the Cretaceous. At present, Leptomaria and Conoto- niaria are the only genera that are recognized as having sunived from the Mesozoic into the Cenozoic. Of the se\"en Cenozoic genera, foursuni\e in the Recent fauna. Accorchng to the litei'ature suneyed, there is no chrono- logical overlap between the Mesozoic genera and the Cenozoic genera. As noted bv a munber of researchers (e.g., Hickman, 1976: 1094: Szabo, 1980: 49; Das, 2002: 99) fossit pleurotomariids are cUfficult to classify objectively, since the criteria upon which fossil pleurotomaiiid genera are de- fined differ conspicuously from those applied to Ceno- zoic genera. The monophyly and ph)'logenetic relationships of the sui-viving Cenozoic genera have been con- firmed using molecrdar data fi'om living representatives (e.g.. Harasew-\-ch et al, 1997; Harasewych, 2002). By contrast, the relationships of Mesozoic genera and the species assigned to them are far less certain, as generic classification tends to be based on relatively iew conspicuous moq^hological features (Table 1) especially those tliat are most easilv derived from poorK*presened specimens and external or intei-nal molds, while other characters are unconstrained and mayvaiywidely. Szabo Fossil localities (1980: 49) commented that "almost all genera can be identifiedwith certainty" on the basis ofthe shape ofthe whorlsectionandthesurfaceofthewhorls, aswell as the Figures 1,2. Locationofcollectionsites. 1. Detailed mapof position and width of the selenizone. Conti and Szabo two localities in soudiwestem Madagascar. 2. Location of sites (1987: 43) raised a question as to the significance of the on a map ofland masses during tlie Late Jurassic. presence or absence of an umbilicus in pleurotomariid — Pa2;e 78 THE NAUTILUS, Vol. 121, No. 2 MESOZOIC CENOZOIC TRIASSIC JURASSIC CRETACEOUS or— c= c= 1o c: 1 a. -TCa3D CD CQL- T-<3aD 1 CD Paleocene EoceneOligocene Miocene Pliocene Pleistocene Recent GENERA OF PLEUROTOMARIIDAE - Mamoeatomaha Begg and Grant-Mackie, 2003 ^ Tahua Begg and Grant-Mackie, 2003 Murihikua Begg and Grant-Mackie, 2003 P/ewrotomaria Defrance, 1826 Omatosp/ra Pan, 1982 Sfuore//a KittI, 1891 I Talantodiscus P. Fischer, 1885 PyrgotrochusP. Fischer, 1885 AnodotomariaSzabo, 1980 Bathrotomaha Cox, 1956 — Cyc/ostomana Szabo, 1980 Laevitomaria Conti and Szabo, 1987 ObomellaCox, 1959 ConotomariaCox, 1959 Leptomaria E. Eudes-Deslongchamps, 1864 Indomaria Das, 2002 - Chelotia Bayle /n P Fischer, 1885 Entemnotrochus P. Fischer, 1885 PerotrochusP. Fischer, 1885 Bayerotrochus Harasewych, 2002 MIkadotrochus Lindholm, 1927 Figure 3. Geological ranges ofthe genera and subgenerawithin the tainiK Pleurotomariidae, arranged b\- tirst occurrence in the fossil record. classification. The presence orabsence ofan umbilicus is SYSTEMATICS sufficient to distinguish the most basal dichotomyamong living Pleurotomariidae, yet this feature remains uncon- Familv Pleui-otomariidae Swainson, 1S40 strained and mayvar}'widelywdthin most Mesozoic gen- Genus Obomella Cox, 1959 eraand even within some "species" as they are currentK Ohonii'lla C:o\, 1959: 238. diagnosed. Itistherefore notsuiprisingthat fossil species Type Species: Plcurotomnria pJicopunctata ]. A. are frequently reassigned from one genus to another Eudes-Deslongchamps, 1849 (Bv original designation). (e.g., Pi/rgoirochus to Laevitomaria Conti and Szabo, Bajocian (Middle lurassic) of France. 1987: 46; Perolrochns to Leptomaria, see Das et al., 2005: 331), especially as more numerous and betterpre- Diagnosis: The genus Ohoniella is characterized h\- a sen'ed specimens become available. shell (lull is low turbiiulorni Id siihlcniicular, with a nar- ^ M. G. Hluase\\•^•cll and S. Kiel, 2007 Paee 79 ^ ^ 3J vT t/:' T^ ijo i^ ^ ^: ,^5 â; tg^j'i- ,'-^ S5 Sooi oo 8 s O ^Qj —— o^ c/^ "c/3^ S Zo ^ ^pi .V L^/O ^0; p -a o p p —"3 o ^ '— b ;^^^yi:2'T::^^pc/5 MCt/SjO' 3 Z z z z m z z Z Z Z Z Z ta °S°S°E°S _= M S ° g ° g c C -; trt — i- ^ ccSû_2uO °QajâE; oajj-fQl < <:s ^ ? =^ 5^ 5^ X (S M S ^ So b ^ c o ^ ^ ^ t -i^ ;/: v5 ^. o J3 bt h i—j _t; < < O aj < < < < CO D >-, dj < ^<CÎ.i.j' ''>o <cir!; •o'54p^L"" _>2j ^<o1^. <^'^1~;, <jo^x_., 2- Ph :s Y < < < < I' « S ^ < S- 2- <_^^^ zo <_0^^ <1^ -t<tx3: ^z= ;^ r <,t- ^<â> Z f0ie;^J<,ZS^ ^<-5Wj -<_CQ^b ^<_S^j _<_sQ^ -<_o^^ <_c^^ < < ^ i^- ^• t- g 5 9 -2 aj "5^ _c '5 „ ^ _2 'p y: y. y; ;/: LO LO lO LO uuuu uuuOu ^ — w c». :/; I Page 80 THE NAUTILUS, Vol. 121, No. 2 rowlyopen umbilicus andastronglyconvexbase. Surface adpressed along the lower edge ofthe selenizone. These sculpture consists of closely spaced collabral costellae features preclude the inclusion of this species in Lep- (usually dominant) and spiral threads. The peripheiy is tomaria E. Eudes-Deslongchamps, 1864, which is char- commonly crenate. The selenizone is narrow, smooth, acterized by convex whorls, with the selenizone at mid- often projecting onto the upper whorl face near the pe- whorl. It is more likelv that this taxon is referable to the riphen'. The labral slit is short. genus Obornella. in wliich the selenizone is situated closer to the peripheiy. Delpev's illustration resembles R(LeomwaerrksJ:urassOibco)rntoelOlxafoisrdkinaonw(nUpfpreomr Jsutrraastsaioc)fTaogaerc(i1a8n3 the partial specimen (Jaitly et al. 2000: 39, pi. 2, figs. SA, Ma to L56 Ma). Greatest diversib,' has been documented B) from tlie contemporary Dhosa Oohte Vlember ofthe Kutsch region of India that was identified as Obornella from Europe (see Griindel, 2003; Hiigele, 2003), and this genus has also been reported from northeastern Iran aff. granulata (J. Sowerbv, 1818). Delpey's taxon is here (Majidifard, 2003) and the Kutch region ofwestern India transferred to Obornella. but its generic affinities remain (Jaitley et al., 2000; Das et al., 2005). ombesnc,uriseluonctaitledt.lie type, which is tire only known speci- Obornella textii (Delpe\-, 1948) Obornella tlionipso)U'nnn new ^pecii (Figure 4, reproduced from Delpew 1948: pi. 2, iig. 1) {Figures 5-12) Lcptomarid tcxta Delpev, 1948: 9, pi. 2, fig. 1. Description: Shell (Figures 5-12) small (holotype Original Description (Translated): "(Height: 25 maximum diameter 42.2 mm, minimum diameter 34.6 mm; chameter 31.5 mm; number ofwhorls: 5). The strip mm, height 26.4 mm) low, turbiniform, consisting ofap- [selenizone] is anterior, wide relative tothe lastturn, and proximateK' 7 teleoconch whorls. Base moderately con- develops/changes normally until the multicarinate stage, vex, with narrow umbilicus (Figure 7, u). Spire angle becoming a little convex. The sculpture is latticed. An 103-106°. Spire shghtly convex in profile. Suture ad- umbilicus obscm'ed bv a lamina piei'ces the con\'ex base. pressed, joining previous whorl at or just below periph- It is similar to Plciimtomaria eiidora d'Orbignv, 1850, eral bulge (Figure 6, pb). Protoconch and first 3-5 te- but the selenizone ot this Oxfordian species is conca\e leoconchwhorls eroded, onlyfinal2—4 teleoconchwhorls between t\\'o carinae, which is noticeablv different trom well presened. Weak shoulder present on whorls 3-5, the Malagasy form. Argovian of Ankiiijv (coll. Hourcq)." becoming convex, rounded in final two whorls. Axial sculpture of oblique radial costae most pronounced on Remarks: UnfortunateK', Delpex- did not specifvwere whorls 3-5 (40-50 per whorl), weaker on subsequent her type material was deposited. Inquiries at the whorls (80-108 per whorl), producing cancellate gran- Museum national d'Histoire naturelle in Paris as well as ules at intersections mth spiral cords, especially at pe- the Universite de Paris revealed that the specimens are ripheral liulge and on either side of selenizone (Figure not deposited in their collections. The description is 10, sz). Number of strong, simple spiral cords 7-9 be- minimal, and the illustration ofthe single, partial speci- tween suture and selenizone, 0-3 on selenizone, 2—4 be- men (Figure 4) is poor, showing aspecimen inwhich the bvveen selenizone and peripheral bulge, 21-22 along selenizone mns alongtheshellperipheiy,withthesuture base, between peripheral bulge and bi'oad parietal callus (Figure 7, pc). Selenizone (Figure 10, sz) narrow, convex, \\itli 0-3 spiral cords, and numerous strong to weak liiniilae, situated just abo\'e peripheral bulge. Aperture o\"ate, rougliK' peipendicular to coiling axis. Outer lip smooth, portion below slit offset from portion above slit by 39°. Slit narrow (-2.5 mm), extending posteriorly 62° from end of suture. Lip thickest in columellar and basal region, forming broad parietal calkis that partly overlaps the umbilicus. Ty^je Locality: Zakaraha, near Toliara (also spelled Tulear). southwestern Madagascar. 6-7 m below surface on plateau cut b\ rixer. Type Material: Holotxpe, USNM 534480; parat\pe 1, USNM 534481; parat)pe 2 USNM 534482, all from the tspe locality. cm Age: Oxloi'dian (Uppei" Jurassic). 1 lillMnoIogv This new species honors Jon and Beverly : Figure 4. Ohonidla texta (Delpey, 1948). Reproductinii ol 'I'hompson for their manycontiilûtions and years ofser- original illustration (Delpey, 1948: pi. 2, fig. 1, as Lcploiiiuiiti vice to The Bailey-Matthews Shell Museum in Sanibel, texUi). Florida. M. G. HaIase^^'^'ch and S. Kiel 2007 Page SI mkmn 8 ^"jajfâjES^'* Si / >^ 11 •«%fl Figures 5-11. Obornella thompsononiin newspecies. 5. Apical, 6. apertural, and 7. basal views ol'the holotype, USNM 5344S0. 8.Apicaland9.dorsalviewsofparatvpe 1, USNM534481. 10. Detailsofsculpturebetweensutureandpeiipheiyonlasttlireedorsal v\-horls ofparatvpe 1. 11. Apicalviewofparatype 2, USNM 534482. Abbreviations: p, peripheiy; pb, peripheral bulge; pc, parietal callus: s, suture; si, posterior limit ofslit: sz, selenizone; u, umbilicus. Remarks: The assignment oi this new species in tlie aperture, and spiral cords along tlie base, features remi- genus Obornella is provisional. The tvpe species of niscent ofthe genus Plciimtoinaria. Obornella thompso- Obornella. Pleiirotomaria plicopiinctata A. Eudes- nonim more closelv leseuibles O. trapeza (Hudleston, J. Deslongchamps, 1849. from the Bajocian (Vlicklle Juras- 189.5: pi. 40, figs. 5a, b) and the "elevated varietv" ofO. sic) of France and England, is near one end of a mor- gramilata (Sovverby, 1818) illustrated bv Hudleston phological spectrum (see Hagele, 200.3: fig. 10) that is (1895: pi. 40, figs, la, b) as Pleiirotomaria granulata var. distinguished bv a low, conical spire and conspicuous ccelata Deslongchamps, 1848, but chffers in havinga less a>dal fluting along the shell peripheiy and base. The pronounced, more rotmdedpeiiphei'albulge, aspirediat other end of this morphological spectrum is character- is stepped along intermediate whorls, and strongly ized by shells with a liigher, stepped spire, a rounder beaded sculpture alongboth sides ol theselenizone. Two Paee 82 THE NAUTILUS, Vol. 121, No. 2 European species ot Ohornclla liad been reported ironi The selenizone is situated below die ramp angle. Surface the Kutch fauna (Jaitly et al, 2000; Das, et al., 2005). sculpture of spiral cords and threads, commonly cancel- Ohoniella wueiirtembergensis (Sieberer, 1908) from late at intersectionwith collabral threads. The selenizone LowerJurassic [upper Bathonian] strata, is much flatter, is moderately broad, the labral slit short. lacks a parietal callus, and has a far broader lunbilicus dian O. thompsononim. Specimens of OborncIIa oraiiu- Remarks: The oldest member ofthis genus is Bathro- lata (Sowerby, 1818) from the Dhosa oolite member of tomaria paipotcnsis Griindel, 2001, from the Sinemurian the Chari Formation [O.xfordian] ofKutsch (Jaitly et al, (Lower furassic) of northern Chile. The selenizone is 2000: pi. 1, figs. 5-7) resemble O. thompsononim in narrow for the genus and the sf)iral sculpture is faint o\erall proportions, but ha\e more convex whorls be- compared to other species. During the Middle and Up- tween suture andperipheiy, farweaker axial sculpture, a per Jurassic the genuswas diverse andwidelydistributed broader umbilicus, and lack the distinctive parietal cal- from Peru (Cox, 1956) to Europe, India, and the Afro- lOubso.rOnbcoIIranctUcaxtatl(iDoemlppseoyn,ori19i4m8)m,avthbeeodnilsytipnrgeuviiosuhseld)-frdoem- Arirs,ab1i9a9n8;EaDsatscoeatstal.(,Co2x0,05)1,96a0,nd19p6o5s;siHbloywaarlstohNaenwd NZoera-- scribed pleurotomailid from the Jurassic of Madagascar, land (Gardner and Campbell, 1997), although the New Zealand record was not figured and needs confirmation. bythe position ofthe selenizone above ratherthan along the peripheiy, and bv having more prevalent sculpture, A numberof specieswere reported from the LowerCre- taceous ofthe Tethyan realm, including the largest spe- especially adjacent to the selenizone. mm The shell microstructures found in OborncUa thomp- cies widi 130 diameter (Das, 2002; Kollniann, 1982, 2002). From the Cenomanian (lower Upper Cretaceous) sononim (Figure 12) are similar to those of pleurotomariids from the Carboniferous (Batten, 1972), Triassic Kiel and Bandel (2004) reported four species oi Bathro- (Bandel, 1991), Jurassic (Btiggild, 1930), Cretaceous iomaria from an intertidal rocky shore setting in Ger- (Kiel, 2006), and Recent (Haras'ewych, 2002), indicating many, the highest diversity at any Cretaceous locality. that shell microstmcture is a veiy consen'ative character Fiuther Upper Cretaceous records are few; the last in tliis group. record is from the lower Maastrichtian of France (Koll- niann and Odin, 2001). Genus Bathroiomaria Cox, 19.56 Bathrotomaria anncjoffcac new species Type Species: Trochus rcticnh/tns Sowerby, 1821. (Figures 13-16) J. (By original designation). Kimmeridgian (Upper Juras- Description: Shell (Figures 13-16) small for genus sic) of England. (liolot\pe nuLxinium diameter 47.7 mm, minimum diam- Diagnosis: BatJirotoinaria can be cUstinguished by its eter 4.3.8 mm, height 50.2 mm), with a tall, conical, usually large (to 130 mm), trochiform shell with a spire strongly gradate spire, consisting of 6+ teleoconch that maybeelevatedtodepressed. Theumbilicus maybe x\'liorls. Base weaklybut evenlvconvex, with very narrow broad to entirely absent. The whorl profile is usually umbilicus (Figure 15, u). Spire angle 72°. Spire very angulate and non-tuberculate, with a broad ramp and a sliglitK' convex in profile. Suture weakh' adpressed, join- second carinaorangulation, just ox'erlapped on the spire. ing previous whorl at or above peripher;il bulge (Figure 14, pb). Protoconch andapproximatelyfirst2teleoconch wliorls missing. Subsequent earlywhorls with sti'aight to weakly convex ramp between suture and ramp angle (Figure 14, ra) that becomes more inflated, convex on bodywhorl. Shell surfacewith liroad, uneven, undulating rugae most evident near the suture. Axial sculpture of evenlv spaced, weak axial eostae (about 120 on body whorl) that produce weakly cancellate sculpture at intersections with spiral cords. Spiral sculpture (Figure 16) dominant, of 10-12 narrow, nearly abutting spiral cords ^r^l betv\'een suture and ramp angle (compiised of single, smooth broad cord), 0-2 spiral cords between ramp angle and selenizone, 6-7 along selenizone, 3^ between selenizone and peripheral bulge. Base with 36-38 spiral cords that are tvxice as broad as intenening spaces. Se- |jm lenizone (Figure 16, sz) broad, weakly convex, nearly OFhiogrunrclela1.2.llwiSEn.pVsloniomnaogneuofewasfpreacciteusreatsutrhfeacaepeorftutlriee jsul.isrtllhv(j-I d;iibsuttatnicnegrbaetmwpeaeiniglrea,msppaannngilnegaslnidghptelyrimpohrerealthbaunlgheal.tAtph-e low the slit, showing the transition from the simple prismatic erture elongate, roughlypentagonal, longa.\is nearlyper- outer layer to the nacreous inner layer. The ai'rows indicate pendicular to tlie cdihng axis. Outer hp broken. Slit areas \vitli reci^x'stali'/ed sjicll material. Abbreviations: Nac, na- broad (-3.8 miii), evtending posteriorlv 117° from the cre; .spr, simple prismatic ciystals. endo( the sutuic. Lip thick along({ihinirllii' I'egion, witli M. C. Han k1 S. Ki 2007 Page 83 Si v':i ::n -Av w 15 13 2 cm /-i^ i^' -^^-^-î-^Tt-Si s^.-^ - ^ '."^•Q ^ OpSiSi- cm 2 t>^ .»-î ra ~^' sz 16 P Figures 13-16. Bathwtomaria anncjoffeae new species. 13. Apical, 14. apertural, and 15. basal views ofthe holotype, USNM 5344S3. 16. Details of sculpture between suture and peiipheiy on last three dorsal whorls of the holob.'jje. Ablire\iations: p, periphery": pb, peripheral bulge; pc, parietal callus; ra, ramp angle; s, suture; si, posterior limit ot slit; sz, selenizone; u, umbilicus. narrow. weakl\" reflected parietal fold that torrns a nar- recogpnition ol her iuan\'contributi(.ins and lonoo;seniceto row parietal callus that partialK' occludes the umbilicus. the fieldofmalacology,. particularlytothe American Ma- lacological Union (nowAmerican Malacological Society) TMa\dpaegaLsoccaarl,it6y'-:7mZabkealroawhas.urfnaecaeroTnolpilaartae,ausocuutthbwyesrtiveerrn. sanedummoinstSarneicbeeln,tlyFlotroidTah.e Bailey-Mattliews Shell Mu- T\pe Material: Holotjpe, USNM 534483, from the t\pe localit\'. Remarks: Bathroimnaiia was among the most wide- spread and diverse of the pleurotomariid genera Age: Oxfordian (Upper Jurassic). throughout the Middle and Uppei- [urassic and Creta- Et\•moIog^: This new .species honors Anne Joffe in ceous. Tliis is particularh'tnieot the lurassic taiuiaofthe Page 84 THE NAUTILUS, \'ol. 121, \'o. 2 Kutch region, from \\'hich ten species liave been re- Type Material: Holot)pe, USNM 5.34484, from the ported (Maithani, 1967; Jaitly et al., 20(10; Das et al, type locality. 2005). Ofthese, five are ofO.xfordian age. From its con- temporar)' congeners within tlie Indo-Madagascan prov- Age: Oxfordian (Upper Jurassic). .; ince, Bathroiomaria anncjoffeac is readilv distinguished Etymology: This new species honors the late Barbara from B. tewnrii (Vlaithani, 1967), B. huddhai Das et al, A. Bedette, whose 52 years of senice to molluscan pa- 2005, B. prasantal Das et al., 2005, and B. dhosaensis leontology at the National Museum of Natural History Das et al., 2005 in ha\'ing a proportionally taller, more has benefited a multitude of researchers. gradate spire and a narrower umbilicus. In shell profile, B. aiDirjoffcae more closely resembles specimens of B. Remarks: Bathrotomaria bedettcac mav be readily reticuJata'iSowerhy. 1821) (Das et al, 2005: figs. 4, A-G) distinguished from B. anncjoffeac, with which it co- and B. siebcreri (JaitK- et al, 2()00:pl. .3, figs.'"2-3) both occurs, on the basis of its lower, broader shell, with a from the Bathonian of Kutsch, and the Oxfordian B. weaker, more rounded ramp angle, by its coarser and luillcpiinctnta (Eudes-Deslongchamps, 1849) (JaitK' et more prominent cancellate sculpture that extends onto al., 2000: pi. .3, fig. 4), but lacks granular whorl angula- the ramp angle and peinpheral bulge, and bythe absence tions of B. siebcreri and B. reticulata (see Das et al., of an umbilicus. Bathrotoniaria bedettcac is similar in 2005:334). Das et al. (2005: 334) also noted that the profile to B. tewarii. B. prasantai, and B. dhosaensis, all Kutch specimens of B. reticulata lack an umbilicus from contemporan- strata in Kutch, but chffers in ha\dng (present in B. annejoffeac). whereas the suture ofB. sie- a more gradate spire and a pronouncedperiphei'al band, bcreri is deeply canaliculated, unhke that ofB. annejof- and in lacking an umbilicus. feae. Bathrotomaria annejoffeac can also be recognized on the basis of the coluniellar portion of die aperture Genus Leptomaria E. Eudes-Deslongchamps, 1864. being long, straight, and nearly co-;Lxial. Type Species: Fleurotoumria amoetm A. Eudes- J. Deslongchamps, 1849. (By original designation). Bajo- Bathrotomaria bedettcac new species. cian (Middle [urassic) of France. (Figures 17-20) Diagnosi,s: Species of Leptomaria can be recognized Description: Shell (Figures 17-20) small for genus on the basis oftheir large, turbinifomi shells «ith low to (holotype ma.\imum diameter 65.0 mm, minimum diam- moderateh' high spires and w-eakl)- to strongl)' rounded eter 58.8 mm, height 47.5 mm), \\'idi a short, broad, whorls. The umbilicus may range from broad to entirely weaklygradate spire, consistingof5+ teleoconchwhorls. absent. The whorl profile is rounded, lacking an angulate Base weakK' but evenly convex, lacking an umbilicus shoulder. The selenizone is situated at mid-whorl. Sur- (Figure 19). Spire angle 92°. Spire weaklycon\ex in pro- face sculpture consists primarilyofnarrow spiral threads file. Suture weaklv adpressed, joining previous \\'horl at \vith finer axial threads forming weakly cancellate sculp- or above peripheral bulge (Figure IS, pb). Protoconcli ture in some species. and approximately first 3 teleoconch whorls missing. Reinarks: Leptomaria has been reported from strata Subsequent early whorls gradate, with str;iight ramp be- ranging in age from Bajocian (Middle [urassic. Knight et tween suture and ramp angle (Figure IS, ra) that becomes more inflated, convexwith increasingwhorl num- a1l9.,831)9.60H)itcokSmealnand(i1a9n76()Palseuogcgeense,teKdoltlhamtanenvaenndsPoeemle, ber. Axial sculpture of broad, low, closely spaced, axial Eocene species niav be included. Not smprisingly, the costae (about 56 on bodywhorl) that produce a coarsely genus had a cosmopolitan distribution, \y\\\\ diverse fau- cancellate sculpture at intersections of spiral cords, in- nas ranging from England (Gox, 1960) to New Zealand cludingweaklvbeaded ramp angle and peripheral bulge. (Hudson, 2003). Leptomaria has been previously re- Spiral sculptru'e codominant, of .3^ low, broad, cords NW ported from Cretaceous deposits of Madagascar between suture and ramp angle, 0-1 spiral cords between ramp angle and selenizone, 0-1 between seleni- (Delpex', 1948; Collignon, 1949; Kiel, 2006). It is repre- zone and peripheral bulge. Base with 17-19 finer spiral sented in the Jurassic fauna of Kutch (Jaitiv et al., 2000; cords that are 2—4 times as broad as inten'cning spaces. Das et al, 2005) but is not as diverse as the genera Bathroiomaria or FJcuroto})uiria. Selenizone (Figure 20, sz) broad, weakly convex, nearly abutting peripheral bulge, spanning slightly more tlian Leptomaria takahashii new species half the distance between ramp angle and peripheral (Figures 21-24) bulge. Surface without spiral cords, sculpture limited to strong lunulae. Aperture elongate, weakly pentagonal, Description: Slicll (Figures 21-24) moderateh' large long axis deflected from the coiling axis by 103°. Outer for the genus (holotype maximum diameter 82.4 nun, lip damaged, slit moqihologx- not knowni. Inner lip thick- minimiun diameter67.23 mm, height57.3 mm) low. t\u-- est along columellar region. binilonii, consisting <il .i[)proximately 6 teleocinuli whorls. Base broadlv and evenly convex, with veiy nar- Type Locality: Zakaraha, near Tohara, southwestern row umbilicus (Figure 23, u). Spire angle 109°. Spire Madagascar, 6-7 m belowsurlace on plateau I'ut b\ i'i\fi'. stronglv couM'x in pnililc. Suturc:' (Figin'e 24, s) abutting. M. C. HarasewAch and S. Kiel. 2007 Pasje S5 2 cm .>i»«^ / c- ;( ' <• f^ 9 ^'^'^'z::^^ 1 2 cm r--~ i. -^ ra ;^ sz 20 I ii**:3aa-^"' Figures 17-20. Bathrotomana bedftteae new species. 17. Apical, 18. apcrtunil, anil 19. basal \ie\\s ol the holohpe, USNM 534484. 20. Details of sculpture between suture and peripher\' on last three dorsal whorls ot die holotvpe. Abbreviations; p, peripher\-: pb, peripheral bulge: ra, ramp angle; s, suture; .si, posterior limit ofslit; sz, selenizone. joiningpre\ious \\'horl ju.st below selenizone (Figure 24, strong, closelv spaced coixls between suture and seleni- sz) in earl\-whorls, at or belowperipherv (Figure 22, 24, zone, 7-9 cords between selenizone and peripheiy, and p) inlaterwhorls. Protoconch andpartoffirstteleoconcii 29-32 cords along base. Spiral cords may become whorl eroded. Earlv teleoconch whorls (whorls 2-4) broader and less distinct with increasing whorl number. evenly rounded, later whorls (whorls 5-6) becoming Selenizone (Figure 24. sz) narrow, convex, situated just more gradate, but e\"enl\' rounded, lacking a angular above peripheiy, with a single, median spiral cord shoulder. A.\ial scidpture ofnumerous fine growth striae pi'esent in earlv whorls, absent in later whorls, and nu- tliat produce a strongh" reticulate pattern most e\ident merous strong to weak kmulae throughout its length. bet\\een adjacent cords in region betvveen suture and Aperture evenlyovate, longaxis formingan angle of103° selenizone ofearly whorls, and broader low, axial costae with coiling axis. Outer lip smooth, portion below slit that fonn a weakl\' cancellate pattern at intersections offset fi'om portion above sHt by 30°. Slit narrow (-3.3 uith the spiral cords. Spiral sculpture dominant, with 10 nnn), extending posteriorlv Sl° from end of suture. Lip