Table Of ContentTHE NAUTILUS 109(4):117-119, 1995 Pane in
New
Perotrochus metivieri, a Species of Pleurotomariid from the
South China Sea (Gastropoda: Pleurotomariidae)
Patrick Anseeuw Yoshihiro Goto
Mispelstraat 18 Yamamoto-Cho Miiiami 5-1-6
9820 Merelbeke Yao Citv, Osaka Prefecture 581
BELGIUM japan'
ABSTRACT Description: Shell (fig. 1) medium-sized for genus
(maximum diameter to 68.0 mm, minimum diameter to
Perotrochus nictivieri. a new species of pleurotomariid, is de- 59.4 mm, height to60.4 mm), thin, light,non-umbilicate.
scribed from bathyal depths in the South C^hina Sea It belongs
tBo"tbh\eBtahsine-rsh(e1l9l6e5d)garnodup"PweirtohtirnocPheursotarforicchaunsuste-rcmoemdpl"eGxr"oub\p' aShdeplrlespsreofdi.leMteraonchisfpiorremawnigtlhecl8e2a°rh('ng=rad3a),teprsopifriel.eSouftupree-
Wagner and Coomans (1990). Comparisonsare made with the riphery rounded, base moderateK- convex. Protoconch
other species of Perotrochus sensu lata that inhabit this area. damaged or worn on all specimens, glassy, of slightly
more than 1 whorl, with weakly flared lip. Teleoconch
Keywords: Pleurotomariidae,Perotrochus. newspecies.South of up to 7-1- whorls. Selenizone appears near suture in
China Sea first 1/4 whorl, descends to mid-whorl b\ whorl 2, and
below mid-whorlby whorl5. Selenizoneflush with whorl
surface or slightK- concave, margins flush or slightly
INTRODUCTION kmeaerlgeid.n sApnaanlnislnitgburpoatdo 1(00t°o,4l.4owmerm)m,arlgoinng,towi7t2h° uApxpiearl
growth striae dominant and strongK prosocline between
A medium-sized specimenof Perotrochus, live-collected suture and selenizone, weak and prosocyrt between se-
but lacking soft parts or operculum, was first brought to lenizoneand periphery, opisthocyrt onselenizone. Spiral
our attention b\ Mr. G. Campanini of Pavia, ItaK who
, sculpture of thin cords (10-12 between suture and se-
had obtained it indirect!) from Russian trawlers oper- lenizone, 1 on selenizone, 5-6 between selenizone and
ating in the South China Sea off Vietnam. Identification
periphery) well-defined on earlv whorls, creating dis-
proved problematic as this specimen resembled to a cer-
tinctly cancellate, finely beaded sculpture above and be-
tain e,\tent both juvenile examples of the high-spired low selenizone of first 3-4 whorls. After 4th whorl, spiral
form of Perotrochus africanus Tomlin, 18-18 and large cords rapidly become obsolete, persisting only as irreg-
adult specimens of P. vicdani Kosuge 1980. A second
idarK-spaced threads in area near the suture and be-
specimen wasobtained by Mr. Donald Danof Baltimore, tween selenizone and periphery. Aperture subquadrate
L'SA. The data accompanying this specimen was vague.
to o\al, curse of columella gently sigmoidal, columellar
TtohehasvheelbleceanmteakfernomoffaNReuswsiZaenalsaonudr.ceAanthdirwdasspaelcliemgeend mtaanrcgeinfrnoamcraexoiuss,tonoptertihpihcekresn.edL,'mebxitleincdusinegxc1a/v5attehde dbiust-
has since been obtained b\' the junior author. imperforate. Base weakly convex, with 40-44 fine spiral
Closeexamination and direct comparison ot these three
cords intersected b\' regular, fine, axial growth lines,
specimens re\ealed consistent tlifferences in a series of producing finely cancellate surface. Protoconch and first
cmheanrsactteorsbeindisshteilnlgumiosrhpehdolforgosm otthhateralRleocwentthePsleeusrpoetcoi-- teleoconch wliorl porcellaneous white; base color of te-
leoconch buft with occasional darker patches and slight,
mariidae. This species is herein described as new, even pinkish suffusion at margins of selenizone. Entire outer
though thelocalit\ datasuppliedwithall threespecimens surface slightly iridescent due to thinness and translu-
is imprecise. cency of outer shell la)er. Interior of aperture (except
base of previous whorl) cosered b\' thin nacreous layer,
SYSTEMATICS within which the pattern of exterior sculpture is dis-
cernible. Nacre covers inner surfaces above and below
Superfamily Pleurotomarioidea Swainson, 1840
FamiK Pleurotomariidae Swainson, 1840 slit, with extremely thin chamfer of constant width at
Genus Perotrochus P. Fischer, 1885 slit margins. Operculum and soft parts unknown
Perotrochus metivieri Anseeuw and Goto, new species Type locality: Trawled in 350 m in the South China
(Figure 1) Sea off N'ietnam.
Page 118 THE NAUTILUS, Vol. 109. No. 4
SNM
Figure 1. Pcwtwchm metwwn Ansefuw and Colo, new species. Apertural, lateral, apieal and ventral \lewsof the holot>pe (L
880085), off N'ietnam, South China Sea. Ma.ximum diameter = 51.1 mm.
Type material: Holotype, USNM 880085, (max di- tional d'Histoire naturelle, Paris, in recognition of his
ameter 51.1 mm, min, diameter 44,7 mm, heiglit 43.8 extensive work in the field of Malacology and his con-
mm), off N'ietnam, Soutfi China Sea, Paratype 1, An- tributions to the knowledge of western Pacific Pleuro-
seeuw collection, (max, diameter 68.0 mm, min. diam- tomariidae.
eter 59.4 mm, height 60,4 mm), from the t\pe localits. Comparative remarks: Pciotrochus metivien is readi-
dPiaarmaettyepre u2,nkDnaonwnC,olmlienc.tidoni,am(estpeerc5i9m.e8nmdma,mahgeeidg,htm5a6x..5 lfyrodmisttihneguSiosuhtehd Ct;rhoimnaalSleao;thPeerrsoptercuicehsushithhierratseoirePiplosrbtreyd,
mm) New Zealand C). 1903(Bondarev, 1991), F, teramachii kuroda,1955 (Lan,
Etymolof^y: This .species is named tor Dr. Bernard Me- 1994; Okutani, 1979), P. caledonicus Bouchet and Me-
tivier of the Laboratoire dc Malacologie, Muscimi na- livier, 1982, and /'. vicdani Kosuge, 1980 (Ravbaudi,
p. Anseeuw and Y. Goto, 1995 Page 119
1992). Insilhouetteit mostcloseK resemblesthesouthern furnished thesecond paratypeas well as valuableadvice.
Atlantic species Perotrochus atlanticus Rios and Ma- The photographs were supplied by Mr. Paul Callomon
thews, 1968, particularly in the profile of the spire, but of Elle Scientific Publications, Osaka, Japan, who also
is otherwise unmistakeable. Of the other species from edited and prepared the manuscript. Finally, we thank
thewestern Pacific,P. tangaroana Bouchetand Metivier, two anonymous referees for their helpful comments.
1982, is similar in size and construction and similarly
lacksa clearcolor pattern, but can bedistinguished from LITERATURE CITED
P. metivieri by its higher, lessgradatespire profile, more
inflatedbasewithcorrespondingly rounderaperture,and Bayer, F. M. 1965. New pleurotomariid gastropods from the
shorter, narrower slit. Perotrochus nictivieri might be western Atlantic, with a summary of Recent species. Bul-
confused with juvenile P. teramachii Kuroda, 1955, but letin of Marine Science 15(4):7.37-796.
the former is smaller in adult form, lacks any clear pat- Bondarev, I. 1991, A rare shell in a fantastic seascape. Ha-
terning, and has a flatter base than P. teramachii. Per- waiian Shell News 39{7):.3,
otrochus metivieri resembles in some respects certain Lan, T. C. 1994. Correct locality data on some important
shells originating from Taiwan, World Shells 9:112-114.
specimens of P. vicdani Kosuge, 1980, from the South Okutani, T. 1979. A new pleurotomariid gastropod from the
aCnhdinpaatSteear,nibnugtatshewseelldiafstefrineilnyhbaevaidnegdsstcruolnpgtucroeloornatitohne RaybaPuadciif,icL.WaMters19o9ff2HoPnlsehuur,otJoampaarni.aVveincudsani3.8(W3)o;r1l6d2-S1h6e3l.ls
teleoconch. 1;84.
Paratype 1 of P. metivieri differs somewhat in shape Rios, E. de C. and H, R. Mathews. 1968, Nova especie de
and appearance from the holotype, in particular by hav- Pleurotomariidae do Brasil (Mollusca: Gastropoda) Arq.
inga distinctly constricted penultimate whorl and slight- EstaaodeBiologia Marinha UniversidadeFederaldoCeara
ly taller profile. Constrictionof thewhorl inmatureadult 8(l);65-68.
specimensisa phenomenonoccasionallyobserved inoth- Wagner, H P. and H. E Coomans 1990. Review of the
er pleurotomariids and may be indicative of a gerontic Perotrochus africanus - complex, with a note on the no-
menclatureoftheWesternAustralianspecies. GloriaMaris
stage.
29(3):41-52.
ACKNOWLEDGEMENTS
Theauthorsareindebted to Mr. G. Campanini forbring-
ingthe first specimen to their attention. Mr. Donald Dan
