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^^ u JiJi THE NAUTILUS Volume 113, Number 1 March 29, 7.9.99 ISSN 0028-1344 A quarterly devoted to malacolooij. EDITOR-IN-CHIEF Dr. Douglas S. Jones Dr. Geerat Vermeij J. Dr. Jose H. Leal Florida Museum of Natural History Department of Geology The Bailey-Matthews Shell Museum University of Florida University ofCahfomia at Da\ds 3075 Sanibel-Captiva Road Gainesville, FL 32611-2035 Davis, CA 95616 Sanibel, FL 33957 Dr James H. McLean Dr. G. Thomas Watters EDITOR EMERITUS Department of Malacology Aquatic Ecology Laboratory Dr. M. G. Harasewych Los Angeles County Museum of 1314 Kinnear Road Department of Invertebrate Zoology Natural History Columbus, OH 43212-1194 National Museum of 900 Exposition Boulevard Natural History Los Angeles, CA 90007 Dr. John B. Wise WSamsihtihnsgotnoina,n IDnCsti2tu0t5i6o0n D%r Arthur S. 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ISSN 0028-1344 CONTENTS THE NAUTILUS 113(l):l-3, 1999 Page 1 A New Lijria (Gastropoda: Volutidae) from Soudieastern Madagascar Philippe Bouchet Museum uational d'Histoire naturelle 55 rue BufTon 75005 Paris FRANCE [email protected] ABSTRACT Description: Shell large, fusiform, naiTovv, verv sohd Lijriapatbaili newspeciesisdescribedbasedon crabbedshells and heavy, consisting oi 2.0 protoconch and 5.75 teleo- taken in lobster pots off Fort-Dauphin, SE Madagascar, a re- conch whorls (Figure 1). Protoconch (Figure 2) large, bul- gion with cooler hydroclimatic conditions that demarcate it bous, apically depressed, widi small slightly involuted nu- from the tropicalconditionselsewherein MadagascarThenew cleus, moderately con\'e.\ whorls, with smooth, glossy sur- species differs from the two other species of Lijria lixang off face, slightly appressed suture. Protoconch/teleoconch Madagascar, L. delesscrtiana and L tulearensis, bv its much transition shaip. Teleoconch whorls moderately convex, larger protoconch, narrower teleoconch, with fewer and lower widi shallow suture. Sculpture consisting of strong, low, axial ribs, less elaborate columellar and parietal plaiting, and a more comple.x color pattern. oithocHne axial ribs, distincdy sigmoid on last adult whorl, discrete, narrow spiral groves in rib interspaces. Sixteen Keij words: Indian Ocean, \'olutidae, endemisni; cold water axi;il ribs on first teleoconch whorls, increasing to 19 on penultimate whorl, 20 on last whorl, interspaces as broad INTRODUCTION as ribs. Thicklabialvaiixbehindperistome. About 10spiral Only two species of volutes (Gastropoda, Volutidae) are groves on first teleoconch whorl, 15 on diird whorl, more presentlyknown from Madagascar, both belonging to the crowded in subsutunil zone, becoming more obsolete on genus Lt/iia Gray, 1847, and both occupying \eiv small penultimate and last whorls. Four stronger, raised cords at base oflast whorl. Aperture ovate, nanow, fonning a nar- ranges ;ilong the west coast ofthe island. Li/iia dclcsscr- tiaim (Petit de la Saussaye, 1842) is restricted to the row angle adapicidlv, outer lip smooth, inner lip fonning a distinct callus over body whorl, expanded, moderately northwestern coast, with all accurately localized records originating from the island of Nosy Be, while Lijria tu- raised over columella; 9 plaits in columellar region, stron- learensis Cosel & Blocher, 1977 is restricted to the south- ger abapicaUy, 3 indistinct wrinkles in parietal region. Si- west, near Tulear [= Toliara, Toliary]. A 1000 km latitu- phonal canal broad, short, open. Protoconch yiolet pink. dinal gap separates the ranges ofthese two forms, which Teleoconch ground colour pinkish salmon widi complex Poppe & Goto (1992) treat as geographical subspecies. pattern ofspiral lines and blotches. Spiral lines bnwTi, in- Apart from one doubtful and unconfirmed record ofLijr- terruptedin interspaces between ribs, fouron spirewhorls, ia lijracfonnis (Swiiinson, 1821) from near Tulear (Poppe nine on last whorl, evenly spaced, delimiting a subsutural & Goto, 1992:72), no Lijria nor anyothervolute is known band twice as broad as distance between lines; brown to occur on the coasts of Madagascar The new species blotches occupying two spiral liands, the broad siibsutmiJ described here has been obtained in the region of Fort- band and a naiTow band, situated abapic;illy of exposed Dauphin as a byproduct oflobster and crab fishing using part of spire whorls and on peripher) of last whorl. Si- baited traps. The sheDs of the three kniown specimens phonal band ;md edge ofsiphonal canal with axially elon- were probably occupied by hermit crabs. The soft parts gateil browm \iolet stripes. Aperture creamy salmon. are not known. The depth where the specimens were Type material: Holotvpe in MNHN. Paratvpe in die col- capturedis not known precisely, but basedon localfishing lection of Mr Harald Doute (Bad Sackingen, Gennany). habits it is very likely to be less than 100 m, and probably Type locality: Region of Fort-Daupliin [= Taolanaro], between 30 and 50 m. soudiem Madagascar (ca. 25°01' S, 47°00' E), from fish- SYSTEMATICS ermen. Class Gastropoda Dimension.s: Length 72.0 mm, width 26.0 mm, ap- Superfamily Volutoidea erture length 37.0 nun. Family Volutidae Rafinesque, 1815 Remarks: The parahpe shares the characters of the Subfamily L\riinae Pilsbrv & Olsson, 1954 holotvpe, but is proportionalK' narrower with a shorter Genus Lijiia Gray, 1847 aperture (length 65.5 mm, width 21.0 mm, aperture Lijria patbaili new species length 28.0 mm), and has three, rather than four, brown (Figures 1, 2) spiral lines on spire whorls, and eight on lastwhorl. Li/r- . Page 2 THE NAUTILUS, Vol. 113, No. 1 a ^JV. Figure 2. Lijria pathaili new species. Protoconch of parahpe, length 65.5 mm. Doute collection. Scale hne = 5 mm. Etymology: The specific name honors Dr Patrice Bail, volute collector and expert, and president of As- sociation Fran^aise de Conchvliologie. Dr Bailverygen- MNHN. erouslv donated the holotype to Distributional and biogeographical remarks: The size and nloq5hol()g^•of its protoconch suggest thatLt/ria pathaili, like manv other volutes, has non-planktotrophic development with intracapsular metamorphosis and )»«. »*-i" ?4'" J -'^ hatches as a crawling juvenile. The region of Fort-Dauphin is characterized in Mad- agascar bv its spectacular belts of brown macrophvtes, ressembhng the algal belts oftemperate coasts (A. Cros- nier, pers. com.); there are no coral reefs in the area. Published satellite data on winter sea surface temperatures (Piton & Laroche, 1993) confirm a local anomaly, with temperatures as low as 21.5°C, vs 24-25°C or more elsewhere around Madagascar. Although the total range ofLi/ria pathaili is not known, it is tempting to associate FHeiigaulriie72I..0 mLjm/.rin pathaili new species Holot\pe MNHN. ttrhiebultoicoanl ohfvdcrerotciliiinmamtaircinceonbdiiottiao.nsSimwiiltahrlvt.hePanliairurtonwtsddies-- lagoae Barnard, 1926, a commercial species of lobster (Crustacea: Palinuridae) has a range in Madagascar re- ia patha'Ji diff<='r.s from the Kvo other species of Lt/ria stricted to near Fort-Dauphin, and other^vise extends inbalvinng M iciagascar, L. dclcssciiiaiia and L tnlear- from Mozambique to Natal (Holthuis, 1984). (iruis h: ''-^ i,-ii;ch larger protoconch, its narrower teleo- With the addition of Lifria pathaili. five species of conch, vviii; v-r and lower axial ribs, less elaborate Lijria are now knowii from the SW Indian Ocean (Fig- coiiiinr-ti-irt'.r'! ";:<:rictal plaiting, andamore complexcol- ure 3) and a further two from Saya de Malha Bank orpai-\ :: :!aefonms is also a ratherslender spe- (Bouchet & Bail, 1991). This distribution pattern is co- cies, ii:-] - . '.'• ."/lourpattern resembles that ofL. herent with the scenario hvpothesized bv Bouchet & patbaii: ;; ': '. • •; spiral bands occupied by brown Biiil (1991), who suggested that colonization by lecitho- reddisli l-kr ':" . -A has an even larger protoconch trophic larvae, although a rare dispersal event, is re- with calcarell:. '• •• . :,;! termination, more convex te- sponsible for the existence ofmorphologicallysegregate, leoconch wh<:iris 0.' 1 '. ;n<erous brown spiral lines. allopatric species.