20 December 19821982 PROC. BIOL. SOc.SOC. WASH. 95(4),1982,95(4), 1982, pp.pp. 639-641639-641 PTERYNOTUS XENOS, AA NEWNEW SPECIESSPECIES OFOF MURICIDMURICID FROM OFF NORTHERN JAMAICA (MOLLUSCA: GASTROPODA)

M. G. Harasewych

Abstract.Abstract.-A—A new muricid, PterynotusPterynotus xenos,xenos, isis describeddescribed fromfrom 6060 metersmeters offoff Discovery Bay, Jamaica. TheThe habitathabitat ofof thisthis newnew speciesspecies isis discussed,discussed, asas areare itsits relationships with closelyclosely relatedrelated RecentRecent andand fossilfossil species.species.

During the preparation ofof aa reviewreview ofof thethe PterynotusPterynotus ofof thethe westernwestern AtlanticAtlantic (Harasewych and Jensen 1979),1979), thethe authorsauthors werewere awareaware ofofa a reportreport ofofPterynotus Pteiynotus phaneus Dall, 18891889 [as[as PtetynotusPterynotus tristichustristichus DaB,Dall, 1889]1889] occurringoccurring inin 7070 metersmeters off Discovery Bay, JamaicaJamaica (Humfrey(Humfrey 1975:1975:136,136, pI.pi. 22,22, fig.fig. 35).35). AsAs thisthis reportreport was not consistent with previouslypreviously recognizedrecognized geographicgeographic andand bathymetricbathymetric rangesranges of this species, and sincesince thethe illustrationillustration castcast doubtdoubt onon thethe identification,identification, wewe feltfelt it best not toto includeinclude thethe recordrecord underunder P.P. phaneus.phaneus. Since that time, additional specimensspecimens fromfrom thethe samesame localitylocality werewere broughtbrought toto my attention by Dr. EmilyEmily H.H. Vokes.Vokes. ExaminationExamination ofof thisthis materialmaterial hashas shownshown that the specimens areare notnot referablereferable toto PtelynotusPterynotus phaneus,phaneus, butbut representrepresent aa newnew species, which isis described here.here.

Family Muricidae Subfamily MuricinaeMuricinae Genus Pterynotus Swainson,Swainson, 18331833 Pterynotus (Pterynotus)(Pterynotus) xenos,xenos, newnew speciesspecies Figs. 1-3 Description.Description.-Shell—Shell smallsmall (to(to 77 mm),mm), fusiform,fusiform, moderatelymoderately heavyheavy forforsize; size; spirespire angle 37-42°; protoconch ofof oneone andand one-quarterone-quarter whorls,whorls, low,low, pitted,pitted, endingending inin aa distinct, thin varix; teleoconchteleoconch withwith 44 convexconvex whorls;whorls; 33 thin,thin, broadbroad varicesvarices perper whorl; first postnuclear whorl smoothsmooth betweenbetween varices;varices; secondsecond andand thirdthird post­post- nuclear whorls with 22 toto 33 intervaricalintervarical nodesnodes ofof equalequal size;size; fourthfourth postnuclearpostnuclear whorl with 2 intervaricalintervarical nodes,nodes, whichwhich maymay bebe unequalunequal inin size;size; spiralspiral sculpturesculpture of 5 to 7 major cords withwith numerousnumerous finefine spiralspiral threadsthreads throughout;throughout; laminaelaminae onon ventral surfaces of varicesvarices veryvery fine;fine; apertureaperture oval;oval; innerinner liplip smooth,smooth, attachedattached posteriorly; outer liplip smoothsmooth oror withwith 44 denticles;denticles; siphonalsiphonal canalcanal ofof moderatemoderate length, open, straight,straight, tiptip slightlyslightly recurvedrecurved dorsally;dorsally; shellshell colorcolor palepale salmon;salmon; operculum, periostracum, andand softsoft partsparts unknown.unknown. Type-specimens.Type-specimens.-Holotype,—Holotype, USNMUSNM 703309,703309, lengthlength 6.306.30 mm;mm; ParatypeParatype I,1, USNM 784590, length 6.156.15 mm; ParatypeParatype 2,2, USNMUSNM 784590,784590, lengthlength 5.085.08 mm.mm. Type-locality.-OffType-locality.—Off DiscoveryDiscovery Bay,Bay, Jamaica,Jamaica, 6060 meters.meters. Range.-AtRange.—At present knownknown onlyonly fromfrom thethe type-locality.type-locality. Material examined.-Theexamined.—The 33 type-specimens.type-specimens. Ecology.Ecology.-Col1ected—Collected fromfrom coralscorals onon reefreef wall.wall. HumfreyHumfrey (1975)(1975) reportedreported col­col- lecting 2 specimens fromfrom aa bladeblade ofof AgariciaAgaricia coralcoral atat thethe type-locality.type-locality. 64064(1 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WWASHINGTONASHINGTO

Figs. 1-3. Pterynotus (Pterynotus) xenos: I,1, Holotype,Holotypc. USNM 703309,703309. (1O.0x);(10.Ox); 2,2, ParatypeParatype I,I, USNM 784590, (IO.Ox);(lO.Ox); 3,3. protoconch of paratype 2,2, USNM 784590.784590. ScaleScale barbar equalsequals 250250 fLm.jtcm, VOLUME 95, NUMBER 4 641641

Etymology.-FromEtymology.—From xenos Gr.—stranger.Gr.-stranger. TheThe namename isis proposedproposed asas aa noun.noun. Remarks.-AlthoughRemarks.—Although PterynotusPterynotlls xenosxenos superficiallysuperficially resembles,resembles, andand hashas beenbeen confused with P. phaneus,phanells, itit maymay readilyreadily bebe distinguisheddistinguished fromfrom thethe latterlatter byby itsits smaller, thicker shell, itsits thickenedthickened varicesvarices whichwhich areare buttressedbuttressed onon thethe aperturalapertural side, its prominent spiral sculpturesculpture asas wellwell asas byby itsits salmonsalmon color.color. TheseThese twotwo species are members of lineageslineages thatthat havehave beenbeen distinctdistinct sincesince thethe MiddleMiddle Miocene.Miocene. Pterynotus phaneus tracestraces itsits originorigin toto thethe HelvetianHelvetian P.P. delaunayidelallnayi (Tour-(Tour­ nouer,1875).nouer, 1875). All known Recent speciesspecies inin thisthis lineagelineage areare membersmembers ofof upperupper continental slope communities. PterynotusPterynotlls xenosxenos isis mostmost similarsimilar toto P.P. venustusvenllstus (Bellardi, 1872) from thethe MioceneMiocene ofof Italy,Italy, bothboth inin appearanceappearance andand habitat.habitat. AsAs more material becomes available, thethe nearestnearest livingliving relativerelative ofof P.P. xenosxenos willwill likelylikely prove to be P. tripterus (Born,(Born, 1778) fromfrom thethe Indo-Pacific.Indo-Pacific. Chicoreus cosmani Abbott and Finlay,Finlay, 1979,1979, anotheranother recentlyrecently describeddescribed mur-mur­ icid from thethe reefs off Ocho Rios, Jamaica,Jamaica, isis alsoalso moremore similarsimilar toto ChicoreusChicorells dujardini (Tournouer, 1875) fromfrom thethe HelvetianHelvetian ofof FranceFrance thanthan toto anyany RecentRecent species. In the light of recent discoveriesdiscoveries ofof relictrelict pocketspockets throughoutthroughout thethe Carib-Carib­ bean (Petuch 1981a, b), thethe offshore reefreef faunafauna ofof northernnorthern JamaicaJamaica wouldwould seemseem to merit further investigation becausebecause itit seemsseems toto substantiatesubstantiate thisthis trend.trend.

Acknowledgments I would like to thank Dr. Emily H. VokesVokes ofof TulaneTulane UniversityUniversity forfor makingmaking thisthis material available for study. II alsoalso thankthank Dr.Dr. VokesVokes asas wellwell asas Dr.Dr. EdwardEdward J.J. Petuch of Continental Shelf Associates,Associates, Jupiter,Jupiter, Florida,Florida, forfor criticalcritical reviewreview ofof thethe manuscript.

Literature Cited

Harasewych, M. G., andand R. H. Jensen.Jensen. 1979.1979. ReviewReview ofof thethe subgenussubgenus PterynotusPlerynollls (Gastropoda:(Gastropoda: Muricidae) in thethe western Atlantic.—NemouriaAtlantic.-Nemouria 22:1-16.22: 1-16. Humfrey,Humt'rey, M. 1975. Sea shellsshells ofof thethe WestWest Indies.Indies. —Taplinger-Taplinger PublishingPublishing Co.,Co., NewNew York.York. 351351 pp.pp. Petuch, E. J. 1981a. AA relictrelict NeogeneNeogene caenogastropodcaenogastropod faunafauna fromfrom northernnorthern SouthSouth America.—America.­ Malacologia 20(2):20(2):307-347. 307-347. --. . 1981b.1981 b. AA volutidvolutid speciesspecies radiationradiation fromfrom northernnorthern HondurasHonduras withwith notesnotes onon thethe HonduranHonduran Caloosahatchian secondary relictrelict pocket.—ProceedingspockeL-Proceedings ofof thethe BiologicalBiological SocietySociety ofof Washing-Washing­ ton 94(4): 1110-1130.

College of Marine Studies, University ofof Delaware,Delaware, Newark,Newark, DelawareDelaware 19711.19711.