A new early Miocene Muracypraea Woodring, 1957 (Gastropoda: Cypraeidae) from the Pisco Basin of southern Peru

2006·2.4 MB·English

NIK \ UT1LUS 120(3 liil 105 2006' Page 101
A new early Miocene Muracypraea Woodring, 1957
(Gastropoda: Cypraeidae) from die Pisco Basin of southern Peru
Thomas DeVries Lindsey T. Groves Mario Urbina
J.
Burke Museum ofNatural History Malacology Section Museo de Historia Natural
and Culture Natural History Museum of Universidad Nacional Mayor de San
University of Washington Los Angeles County Marcos
Seattle. WA 98195 USA 900 1'Aposition Boulevard Departamento de Paleontologia de
Los Angeles. CA 90007 USA Vertebrados,
[email protected] Avenida Arenales 1256, Jesus Maria,
Apartado 14-0434
Lima 14, PERU
ABSTRACT Stratigraphy and Age
The cypraeid gastropod, Muracypraea ormenoi newspecies, is The Pisco Basin is a forearc basin that extends along the
described from lower to middle Miocene beds of the upper- narrow coastal plain of southern Peru from Paracas to
most Oligocene to middle Miocene ChilcatayFormation. Pisco Nazca, lea Department (Figure 1). Figure 2indicates the
Basin, southern Peru. It is the first cypraeid reported from type locality of the new species. Cenozoic marine beds
southern Peru and represents the southernmost occurrence oi are exposed throughout the coastal desert, including
this genus. Muracypraea is normally a warm-water gastropod those of the upper Oligocene to middle Miocene Chil-
and its occurrence in die study area indicates dispersal by catay Formation and the overlying lower middle Mio-
meansoicoastalcountercurrentsintowaterspossiblycooledby cene through middle upper Pliocene Pisco Formation
coastal upwelling. Thenewspecies shares aneritichabitatwith (DeVries, 1998).
endemic molluscan taxa andwith taxa ranging northward from
the Navidad Basin ofcentral Chile.
Chilcatay Formation
The name Chilcatay Formation was assigned to upper
Oligocene to lower Miocene strata near Pampa Chil-
INTRODUCTION
catay, approximately 60 km west of lea, by Dunbar et al.
(1990). The Chilcatav Formation consists ofbasal sand-
Muracypraea ormenoi newspecies is described from the stones associated with a transgression at approximately
Chilcatav Formation of the Pisco Basin, southern Pern. 25 Ma (DeVries, 2001), tuffaceous and diatomaceous
Associated mollusks and microfossils from correlative siltstone indicative of shelf depths and a coastal-up-
nearbv strata indicate an age of approximately 20 Ma welling regime (Dunbar et ah, 1990), and intercalated
iearlv Miocene) for its occurrence. The new species is coarse-grained sandstone that may represent short-lived
represented by a well preserved holotype and a poorly early Miocene eustatic sea-level events (DeVries, 1998).
preserved specimen. This new species represents the Machare and Fourtanier (1987) estimated the strati-
southernmost occurrence of Muracypraea Woodring,
graphic thickness ofthe Chilcatay Formation at approxi-
1957, and indicates a dispersal into waters of austral- mately 250 m.
coastal upwelling emironments. The new species also
shares a neritic habitatwith endemic molluscan taxa and
Pisco Formation
taxa ranging northward from the Navidad Basin ofcen-
tralChile (DeVries andFrassinetti, 2003). Its occurrence Unconformablyoverlying the Chilcatav Formation is the
at 15°S also accentuates the modem-day diminishment Pisco Formation of Adams (1909), named for steeply
ofthe range ofMuracypraea since the early and middle dipping, white and yellowish rocks exposed at the end of
Miocene, because M. mus (Linnaeus, 1758), the last liv- the Huamani bridge over the Rio Pisco north of Pisco,
ingrepresentative ofthegenus, is restrictedtothe south- Peru. Dunbar et al. (1990) reported that the age ofthe
western Caribbean coasts of Venezuela and Colombia Formation is late middle Miocene through Pliocene (4—
(Lorenz and Hubert, 2000). 12 Ma), based on K/Ar dates combined with siliceous
mierofossil zonation, whereas DeVries and Schrader
(1997), DeVries (1998), and DeVries and Frassinetti
Mailing address: Box 13061, Burton, WA 9S013 USA (2003) assigned an early middle Miocene to middle late
Page 102 THE NAUTILUS, Vol. 120, No.
QlAT
Ma
76°W 74°W -5-CPLEINOE- 1AKMIl
[ -i
LATE Pisco
Fm.
-10-
Paracas
Z MID.
Peninsula nRI -15- uw
o
-14°S
%
-20- EARLY Chilcatay
Fm.
-25- UzJ
LATE
LOCATION u
OFFIGURE 2 -30- u OturaaFm.
EARLY
o
-35- LATE Yumaque
Fm.
LZU Pisco Basin LosChoros
16°S -40- tzu Fm.
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-45-
SCALE
CAMANA
Figure 1. Indexmapshowinglocation ofthe Pisco Basin in southern Pern andchronostratigraphyof the Pisco Basin (DeVries and
Schrader, 1997).
Pliocene age to the bioclastic conglomerates, tuffaceous warty, or bituberculate, or rarely a central "spike-like"
siltstones, and diatomaceous siltstones based on diatom dorsal tubercule present; labial lip wide, slightly con-
biostratigraphy and their revised molluscan biostratigra- stricted near anterior end, teeth moderately strong; col-
phy. The formation varies in thickness throughout the umella wide, teeth strong to weak or absent; aperture
Pisco Basin from about 200 to 1000 m thick (Dunbar et wide, curving in posterior direction toward columella;
al„ 1990). fossula indistinct, wide, shallow, smooth; anterior termi-
Abbreviations: Abbreviations used for institutional nal ridges strong and may extend forward in a flattened
catalog and/or locality numbers are as follows: DV, col- or flange-like manner; terminal canals prominent.
lecting localities ofThomas DeVries: LACMIP, Natu- Geologic Range: Early Miocene (Aquitanian) to Re-
J.
ral History Museum of Los Angeles County, Invertebrate cent.
Paleontology Section; USNM, National Museum of
Natural History, Smithsonian Institution, Washington, DC.
%
Measurement parameters are defined as follows: 75°45'W 75°40'W
length = greatestdistancebetween anteriorandposterior N \ Y^jCerro
termini, width = greatest distance between lateral mar- A % J ALaBruju
gins, and height = greatest distance between base and N LACMIP
dorsum. The systematic classification herein follows that .,M7615 /('
of Schilder and Schilder (1971) with modifications by (DV 553//1) LACM
Kay (1996). ,p
SYSTEMATIC PALEONTOLOGY r^-, Yesera M
So> deAmara\\
Superfamily Cypraeoidea Rafinesque. 1815 #
Locality-samples
Family Cypraeidae Rafinesque, 1815
n 5km
Subfamily Bernayinae Schilder, 1927
SCALE
Genus Muracypraea Woodring, 1957
Contourintervalis 100m.
Type Species: Cypraea inns Linnaeus, 1758, by origi-
nal designation. Recent, Venezuela and Colombia. Figure 2. Index map showing the t\pe locality of Mura-
cypraea niiiiciioi new species at UllujallaWest (LACMIP loc.
Diagnosis: Medium to large size, puilorm or triangu- 177S.3), and localih DV 553-1 (LAcMlP Inc. 17615). Dashed
lar shaped; posterior portion of dorsal surface smooth, lines indicate roads.
T. DeVries et al, 2006 Page 103
Geographic Range: Miocene: Dominican Republic, Groves (1997, 1998) proposed that a distinctly rhomboi-
Haiti, Trinidad, Cuba. Jamaica. Venezuela, Colombia, dal, bituberculate lineage be recognized in the western
Panama, Brazil, Ecuador, Pern, Costa Rica, Michoacan, Caribbean and tropical eastern Pacific that included
Mexico, and Baja California Sur, Mexico; Miocene/ specimens previously assigned to M. henekeni (Marks,
Pliocene: Imperial Comity, California, USA; Pliocene: 1951; Olsson, L964), as well as the Pliocene Ecuadorian
Venezuela, Panama, Ecuador; Pleistocene: Venezuela; species, M. cayapa (Pilsbry and Olsson, 1941).
Recent: Venezuela and Colombia.
Muracypraea ormenoi new species
Remarks: In a monograph ol the Miocene Gatun For- (Figures 3-5)
mation oi Panama, Woodring (1959) acknowledged the Diagnosis: A medium-sized Muracypraea of weakly
variabilityol Muracypraea henekeni (Sowerby, 1850) and rhomboidal shape; outer lip extended posteriorly well
the excess of names applied to this species. He stated beyond inner lip; dorsum bituberculate with posterome-
that "some ofthe names in the synonymy may prove to
dial depression.
be useful for local populations when adequate samples
are available." Groves (1997) reviewed the cypraeiform Description: Shell medium in size; slightly rhomboi-
gastropods oi northwestern Ecuador and discussed the dal shape; dorsum nioderateK arched, maximum height
stratigraphic and geographic distribution ol the M. (apex) slightly posterior to midpoint; base slightly flat-
henekeni group in Panama, Ecuador, and Colombia. tened; surface generally smooth; lateral margin of right
Figures3-5. Muracypraeaormenoi new species,holotypeLACMIPno.8197,length = 64.9 nun 3. Dorsalview. 4. Aperturalview.
5. Labral lateral \ie\v.
Page 104 THE NAUTILUS, Vol. 120, No. 3
sideweaklycorrugatedventrallv; dorsum withbroad, low Discussion: Muracypraca ormenoi is the first cypraeid
tubercles; tubercle on labralside situated axiallybetween reported from the Pisco Basin. Although post-burial pro-
apex and periphery; tubercle on columellar side smaller cesses have damaged the mid-dorsal and the posterior
and situated slightly more posteriorly and closer to axial dorsal surfaces and the anterior columellar terminal
median; medial tubercle at apex absent or broken; me- ridge oi the holotype ofthe new species, preservation is
dial posterior depression present between tubercles; ap- adequate for unequivocal generic assignment. The non-
erture moderately wade, curved strongly posteriorly to- type specimen is a poorlv preserved specimen consisting
ward columella; outer lip extending posteriorly beyond ot three fragments, including labral and columellar lips
inner lip; outer lip with 17 short simple teeth; columella and severalinternalwhorlswithin matrix. Some mollusks
withabout 13shortweaksimpleteeth, fadingposteriorly; associated with M. ormenoi in Peru range southward to
denticular interstices smooth; terminal ridge not visible; the Miocene Navidad Basin of central Chile (Table 1;
fossula narrow, mostly covered; siphonal canal long, bor- DeVries and Frassinetti, 2003). Other species associated
deredby spatulate extensions ofcolumella and outer lip; with M. ormenoi range northward to the Talara Basin of
terminal canals moderately extended, very weakly northern Peru, situated at the same low latitudes where
rimmed. warm sea surface temperatures help define the modern
Panamic Faunal Province. Despite the warm-water en-
Comparison: The newspecies is most similartoWood- vironment indicated bv the southern Peruvian Miocene
ring's (1959) hypotype oiCypraea (Muracypraca) Jienek-
faunas, sedimentological indicators including diatoma-
eni [= Muraci/praca mus isthmica (Schilder, 1927)],
USNM 562603 (pi. 31, figs. 6-7) from the upper Mio- ceous siltstone, synsedimentary horizons of remobilized
cene Gatun Formation of Panama. Muracypraca or- dolomite, and phosphatic concretions (Dunbar et al.,
1990) point to the existence ofhigh primaryproductivity
menoi has fewer columellar teeth, a less inflated col-
along the southern Peruvian margin duringthe earlyand
uamreclhlead,asdeMe.permutserimsitnhamlicac.anCalosl,oranpadttiesrnnoatsiadse,hwihghelny middle Miocene. Then, as now, the impetus for high
primary production and would have been coastal up-
compared to several specimens of the Recent M. mus
hicornis (Sowerby, 1870) [LACM 90-47.1 (LACM Mal- welling. Upwelledwaters were probablycooler than sur-
am1,coorflipgoshg.oyl1c1oo,glly1e6cb,tei1to9nw]),e;ewsneeeMn.aoltsmeouaLsosrbteiricnkozirnnaginssdiamHinuldbaretirhttey,in2ne0o0wv0e,srpapeli-l. wfealacerevmawetaretdedrusar,tibnpugrtetstheeenmtep,aerrlsavitnuMcrieeosctehmneaey,wosartsilldlw'ehslalvoe(cSebaaevniensnemwtoearrl.ee,
cies. However, the new species has a more inflated col- 1985; Lourens et al., 2004).
umella, fewer columellar teeth, and deeper terminal ca- Material: Muracypraea ormenoi new species is repre-
nals than M. mus bicornis. Muracypraca angustirima sented by the moderately well-preserved holotype from
(Spieker, 1922), the other Peruvian muracvpraeid spe- the upper Oligocene to lower Miocene Chilcatay For-
cies, from the early to middle Miocene Zorritos Forma- mation and an incomplete specimen from the overlying
tion of Tumbes Department, northern Pern, lacks the lower middle Miocene to upper Pliocene Pisco Forma-
dorsal tubercules, has a straighter aperture, has more tion. The non-type specimen (LACMIP no. 13070) was
columellar teeth, and has a more inflated columella than collected by the senior author in June, 1987, near Cerro
the new species. Submarino, east of Yesera de Amara, lea Department,
Table 1. Mollusks from the Chilcatayand lowermost Pisco formations ofsouthern Peru associatedwith Muracypraca armenoi new
species and their occurrence in depositional basins to the north and south.
Species 'alara Basin Northern Peru Navidad Basin Central Chile
Acanthina katzi (Fleming, 1972)
Eucrassatella ponderosa (Philippi. 1987)
Ficus distans (Sowerby, 1846)
Glijcymeris colchaguensis (Hupe, 1954)
Glycymeris ibariformis (Frassinetti and Covacevich, 1984)
Miltha vidali (Philippi. 1887)
Olvoancellaria claneophila (Duclos, 1835)
Testallium cepa (Sowerby, 1846)
Architectonica karsteni (Rutsch, 1934)
Chionopsis sp.
Conns spp.
Dosinia sp.
Gonyscyon sp.
Phyllonotus sp.
Terebra sp.
Turritella woodsi (Lisson, 1925)
Turritella injnicaimiiln iCiv/bowski, 1899)
T. DeVries et al„ 2006 Page 105
Peru (14°34'26"S. 75°40'30"W) [DV 553-1, = LACMIP Neogene strata ol northwestern Ecuador, with the de-
loc. 17615] scription tA' two new species. Tulane Studies in Geology
and Paleontology 30: 147-158.
TnuynpeinMlaetnegrtiha,l:4S.3IlnoulnotvipnewiLdAthC,M3I1P.9nmo.m81in97h,ei6g4h.t.9 Groversi,ng,L.1T9.5719(9MSo.llTuhseca:cyGparsaetirdopgoednau)sinMutrhaecyCparriabebaeaWnooadn-d
Collected in October2004 by Manuel Ormeiio, Ocucaje, adjacent regions: How manyspecies are there andwhat is
Peru. M, henekeni (Sowerby, 1850)? PaleoBios 18 (supplement
Type Locality: LACMIP loc. 17783, between Yesera to 3): 3.
de Amara and the Rio lea, less than one km north of Kay,CEh.apA.ter191986..InE:vToalyultoiro,naryD.r(aeddi.a)t,ioOnrsigiinnatnhedeCvyoplruateiiodnaaer.y
Cerros Las Tres Pvramides [herein designated Ullujalla radiation of the MolluscJ.a. Oxford University Press, Lon-
West] (about L4°34'50" S, 75°38'40" W; Lomitas 1: don, pp. 211-220.
100,000 quadrangle), lea Department, southern Peru, Linnaeus, C. 1758. Systema naturae per regna tria naturae.
upper Oligocene to lower Miocene Chilcatay Formation Edito decima, reforniata. Regnum animale 1, Holmiae,
(Figure 2). 824 pp.
Etymology: Named after Manuel Ormeno who col- Lorenz, F. andA. Hubert. 2000. Aguidetoworldwidecowries.
lected the holotype and was one of the principal Field 2"' edition. ConchBooks, Hackenheim, 584 pp.
Lourens, L., F. Hilgen, N.J. Shackleton, Laskar, and D.
workers employed by Mario Urbina. Wilson. 2004. The Neogeneperiod. ChaJp.ter21. In: Grad-
stein, F. M., G. Ogg, and A. G. Smith (eds.) A geologic
J.
ACKNOWLEDGMENTS timescale 2004. Cambridge University Press, Cambridge,
pp. 409-440.
We
wish to thank Rodolfo Salas ofthe Universidad Na- Machare. and E. Fourtanier. 1987. Datation des formations
J.
cional Mayorde San Marcos, Museode Historia Natural, Tertiaires du Bassin de Pisco (Perou) a partir
Laboratorio de Vertebrados, Lima, Peru, and Dr. Niels d'associations de diatomees. Comptes Rendus de
Valencia, director of the museum, for their support of l'Academie des Sciences, Paris, Serie 2, 305(5): 407-412.
invertebrate paleontology in Peru. We also thank James Marks, J. G. 1951. Miocene stratigraphy and paleontology of
11 McLean and Angel Valdes (LACM Malacology), southwestern Ecuador. Bulletins of American Paleontol-
LouElla Saul (LACMIP), and Richard L. Squires (Cali- ogy 33(139): 277-433.
Olsson, A. A. 1964. Neogene mollusks from northwestern Ec-
fornia State University, Northridge, Geological Sciences)
uador. Paleontologies! Research Institution, Ithaca, 256
for reviewing early drafts ofthe manuscript and offering
helpful suggestions. The evaluations ofCharles L. Pow- Pilsbrpvp,.H. A. and A. A. Olsson. 1941. A Pliocene fauna from
ell. II (U.S. Geological Survey, Menlo Park, CA) and western Ecuador. Proceedings ofthe AcademyofNatural
Robert }. Stanton (LACMIP) greatly enhanced this pa- Sciences ofPhiladelphia 93: 1-79.
per. Donald W. McNamee (LACM Research Library) Raiinesque, C. S. 1815. Analyse de la nature, ou tableau de
assisted die second author in locating several obscure Funivers et des coips organises. Palermo, 224 pp.
references. Additional thanks to Angel Valdes for his Savin, S. M., L. Abel, E. Barrera, D. Hodell, P. Kennett, M.
J.
generous assistance with the manipulation ofdigital im- Murphv. G. Keller. | Killinglev, and E. Vincent. 1985.
ages. TheevolutionofMiocenesurfaceandnear-surfacemarine
temperatures: Oxygenisotopicevidence. In: Kennett, P.
J.
(ed.) The Mioceneocean: Paleoceanographyand biogeog-
LITERATURE CITED
raphv. Geological SocietyofAmerica Memoir 163: 49-82.
Adams, G. I. 1909. An outline review ofthe geology of Peru. Schilder, F. A. 1927. Revision der Cypraeacea (Moll., Gastr.).
AnnualReportofthe BoardofRegentsofthe Smithsonian Archiv fur Naturgeschichte 91A(10): 1-171.
Institution for 1908: 385-430, figs. 1-12, pis. 1-5. Schilder, M. and F. A. Schilder. 1971. A catalogue offossil and
DeVries, T. 1998. Oligocene deposition and Cenozoic se- living cowries. Institut Royal des Sciences Naturelles de
quence Jb.oundaries in die Pisco Basin (Peru). Journal ol Belgique, Memoire 85: 1-246.
Soudi American Earth Sciences 11: 217-231. Sowerby, G. B., II. 1850. Descriptions ofnew species ofiossil
DeVriMeiso,eeT.neJ.ag20e01o.f'MPoarlalcuass'cabnedesviidnenscoeudifeorrnanPerOul.igBoocleentei-n sGheeolllosgifcoaulndSocbiyetJy.oSf.LoHnednoink,erQuEasrqt.erlPyroJcoeuerdnianlg6s: 4o4f-5t3h,e
de la Sociedad Geologica del Peiii 92: 57-65. pis. 9-10.
DeVries, T. and D. Frassinetti. 2003. Range extensions and Sowerby, G. B., II. 1870. Monograph of the genus Cijpraea.
J.
biogeographic implications ofChilean Neogene mollusks Thesaurus Conchyliorum 4. London, 58 pp., 37 pis.
found in Peru. Boletin del Museo National de Historia Spieker, E. M. 1922. The paleontology ol the Zorritos Forma-
Natural, Chile 52: 141-157. tion ofthenorthernPeruvianoilfields.TheJohns Hopkins
DeVries,T. and H. Sehrader. 1997. Middle Miocene marine University Studies in Geology 3: 1-197, pis. 1-10.
J.
sediments in die Pisco Basin (Peru). Boletin de la So- Woodring, W. P. 1957. Muracypraea, new subgenus of
ciedad Geologica del Peru 87: 1-13. Cijpraea. The Nautilus 70: 88-90.
Dunbar, R. B., R. C. Marry', and P. A. Baker. 1990. Cenozoic Woodring, W. P. 1959. Geology and paleontology ol Canal
marine sedimentation in the Sechura and Pisco basins, Zone and adjoining parts ofPanama. Description of Ter-
Peru. Palaeogeographv, Palaeociimatology, Palaeoecology tiary mollusks (Gastropods: Vermetidae to Thaididae).
77: 23.5-261. U.S.GeologicalSurveyProfessionalPaper306-B:III+ 147-
Groves, L.T. 1997. A review ofeypraeiform gastropods from 239.