－１－ During KT07-31 cruise ofRV“Tansei-maru”ofthe Japan Agency for Marine Science and Technology (JAMSTEC),trawling and dredging operationswere made in sublittoral to upper bathyal depths (100－ 1330 m)in the SagamiSea and Izu Islands,centralJ a-pan.Taxonomicreportson decapod crustaceans,per -taining to the collection made by this cruise, have been published (e.g.,Komai,2011a;2011b;2012;2013), although partofthe collection stillremainsto be st ud-ied.In thisarticle,a new speciesofthe pagurid her -mitcrab genusCatapaguroidesA.Milne-Edwardsand Bouvier,1892,C.tanseiae,isdescribed and illustrated on the basisofa single male specimen collected from SagamiBay during thiscruise.The new species ap-pears closest to C. pectinipes (Lewinsohn, 1969), known only from the Red Sea (Lewinsohn, 1969; Türkay,1986),among the 28 congenericspecies.Dif -ferentiating charactersbetween the new speciesand C. pectinipes are discussed. The new species repr e-sentsthe eighth ofCatapaguroidesknown from J apa-nese waters.
The holotype ofthe new speciesisdeposited in the collection ofthe NaturalHistory Museum and Insti -tute, Chiba (CBM). General terminology follows McLaughlin etal.(2007),exceptfornumbering oft ho-racicsternites.Shield length (sl),measured from the tip ofthe rostrum to the midpointofthe posterior margin ofthe shield,indicatesspecimen size.
Taxonomy
Family Paguridae Latreille,1802
GenusCatapaguroidesA.Milne-Edwardsand Bouvier, 1892
Catapaguroidestanseiaesp.nov. (Figs.1－5)
Material examined. Holotype: male (sl 1.8 mm), RV “Tansei-maru”,KT07－31 cruise,stn L－2－100,S ofJ
o-gashima,SagamiBay,35°05.693'N,139°35.506'E,146 m, 25 November2007,dredge,coll.T.Komai,CBM-ZC 12095.
Description. Ten pairs of biserial phyllobranchiate gills;third maxilliped with 2 smallarthrobranchs, an-teriorgillslender,non-lamellate,posteriorgillmuch smaller,weakly lamellate (Fig.1E);cheliped with tiny but distinctly lamellate arthrobranchs; no pleur o-branchson wallofthoracicsomite 7.
Shield (Fig.1A)approximately aslong aswide; an-teriormarginsbetween rostrum and lateralprojec -tions concave; anterolateral margins sloping, posteriormargin roundly truncate;dorsalsurface al -mostglabrous.Rostrum broadly rounded.Lateralpr o-jections obtusely triangular, produced to level of rostrum,each with marginalspinule.
Ocularpeduncle (Fig.1A)moderately stout,about 0.8 times as long as shield, slightly constricted at Nat.Hist.Res.Vol.13 No.1:1－9.February 2014
A
New
Speci
es
of
t
he
Hermi
t
Crab
Genus
Cat
apagur
oi
de
s
A.
Mi
l
ne-
Edwards
and
Bouvi
er,
1892
(
Crus
t
acea:
Decapoda:
Anomura:
Paguri
dae)
f
rom
Sagami
Bay,
Japan
Tomoyuki
Komai
NaturalHistory Museum and Institute,Chiba 955-2 Aoba-cho,Chuo-ku,Chiba 260-8682 Japan
E-mail:[email protected]
AbstractThe pagurid hermitcrab genusCatapaguroidesA.Milne-Edwardsand Bouvier,1892, isheretofore represented by 28 speciesworldwide,ofwhich 26 speciesoccurin the Indo-West Pacific.In thisarticle,a new speciesofthe genus,C.tanseiae,isdescribed and illustrated on the basisofa single male specimen from SagamiBay,centralJapan,ata depth of147 m.The new speciesappearsclosestto C.pectinipes(Lewinsohn,1969),possibly endemicto the Red Sea.Differ -entiating charactersbetween the two speciesare discussed.The presentnew speciesisthe eighth ofthe genusknown from Japan.
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Fig. 1. Catapaguroides tanseiaesp.nov.,holotype,male (sl1.8 mm),CBM-ZC 12095.A,shield and cephalic ap-pendages,dorsalview;B,distalpartofultimate segmentofleftantennularpeduncle,obliquely lateralview;C, fourth,third and second segments(distalpart)ofleftantennalpeduncle,ventralview;D,leftthird maxilliped, lateralview;E,basalpartofleftthird maxilliped,showing arthrobranchs;F,ischium ofleftthird maxilliped, ventralview;G,leftfourth pereopod,lateralview;H,thoracicsternite 6,ventralview;I,coxae offifth per eo-podsand thoracicsternite 8,ventralview;J,coxa ofleftfifth pereopod,ventralview;K,telson,dorsalview. Scale bars:0.5 mm.
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A new speciesofCatapaguroidesfrom Japan aboutmidlength;dorsalsurface mesially with row of
setae increasing in length distally; cornea normally developed,rounded,weakly dilated,cornealwidth ap-proximately 0.3 of peduncular length. Ocular acicle triangular,with minute submarginalspine,separated to each otherbasally by basalwidth ofmore than 2 acicles. Inter-ocular lobe with slightly convex ant e-riorsurface.
Antennularpeduncle (Fig.1A),when fully ext end-ed,overreaching distalcornealmargin by 0.9 length ofultimate segment.Basalsegmentwith spinule pr ox-imolaterally. Ultimate segment about 0.7 length of shield, slightly broadened distally in lateral view, with 2 long plumose setae atdorsolateraldistalpor -tion (Fig.1B),followed by 7 or8 setae on dorsalsur -face decreasing in length proximally. Dorsal flagellum slightly longer than ultimate peduncular segment,with distalportion more than twice length ofproximalaesthetasc-bearing portion.
Antennalpeduncle (Fig.1S)slightly overreaching distalcornealmargin.Fifth and fourth segmentswith few short setae. Third segment with 1 prominent spine at ventromesial distal angle (Fig. 1C). Second segment with dorsolateral distal angle produced in simple spine nearly reaching to midlength offourth segment;dorsomesialdistalangle with minute spine. First segment unarmed. Antennal acicle slender, slightly arcuate, overreaching corneal base but not reaching distalcornealmargin,terminating in spine, with row ofshortto moderately long setae over en-tire length.Antennalflagellum exceeding 5.0 timesof shield length;articleseach principally with few short setae and moderately long setae (about2.0 length of article)every 2 articles.
Third maxilliped (Fig.1D)slender;ischium (Fig.1F) with crista dentata poorly developed,bearing only 1 small tooth at midlength. Merus and carpus each withoutdorsodistalspine.
Chelipedsgreatly unequalin length and dissimilar. Rightcheliped (Fig.2A－D)elongate;propodal-carpal articulation rotated clockwise about20°from per pen-dicular.Chela elongate subovate in dorsalview,about 2.3 timeslongerthan wide,widestatproximalto base of dactylus. Dactylus articulating obliquely with palm,about0.6 length ofpalm,somewhatcurved ven-trally; dorsal surface slightly convex, dorsomesial margin notdelimited,unarmed;cutting edge with 3 broadly triangular calcareous teeth, terminating in minute corneousclaw;scattered tuftsofshortto mod-erately long setae on surfaces.Palm about0.9 times
longer than carpus; dorsal surface gently convex, with row of 6 tiny spines adjacent to dorsomesial margin;dorsolateraland dorsomesialmarginsr ound-ed; lateral, mesial and ventral surfaces with sparse tuftsofshortto long setae;ventralsurface slightly convex.Fixed fingergently curved ventrally,with 2 broadly triangularcalcareousteeth on cutting edge, terminating in minute corneousclaw.Carpussubc y-lindrical,about1.3 length ofmerus,narrowed atbase, about2.5 timeslongerthan distalwidth;dorsalsur -face unarmed;ventrolateraldistalangle with minute tubercle, ventromesial distal margin unarmed; sur -faceswith scattered tuftsofshortto long setae;none ofthese setae notparticularly thickened orbristl e-like.Meruswith row oftuftsofmoderately shorts e-tae on dorsal surface; dorsodistal margin without spine; lateral surface almost glabrous, ventrolateral margin generally convex,with 1 minute subterminal tubercle; mesial surface with some tufts of moder -ately short setae dorsally and long setae ventrally, ventromesialmargin with 1 tiny distalspine;ventral surface with numeroustuftsoflong setae.Ischium un-armed;mesialsurface with some tuftsofshortto mod-erately long setae. Coxa with small spine at ventrolateraldistalangle.
Leftcheliped (Fig.3A－D)slender,reaching nearly to base ofdactylusofrightcheliped;propodal-carpal articulation rotated counter clockwise about 20° from perpendicular. Chela not particularly arched, widest at base of dactylus, about 2.9 times longer than wide.Dactylussomewhatcurved in dorsalview, subequalin length to palm,unarmed,with scattered tuftsofshortto long setae;dorsomesialmargin not de-limited; cutting edge with row of minute corneous teeth in distal half, terminating in small corneous claw.Palm approximately halflength ofcarpus;dor -salsurface moderately convex,with 3 tiny spinesand 2 low protuberances on dorsomesial margin, other -wise unarmed;surfaceswith scattered tuftsofshort to long setae.Fixed fingerbroken in distalpart.Car -pus elongate, slightly widened distally, about 2.6 timeslongerthan distalwidth;dorsalsurface with 1 tiny median spine proximalto midlength and 2 low protuberances proximally on dorsomesial margin; dorsomesialdistalangle with 1 prominentspine;sur -faceswith scattered tuftsoflong setae,setae on dor -somesialproximalprotuberancesslightly thickened; ventralsurface slightly convex.Meruswith tuftsof shortto moderately long setae on dorsalsurface;dor -sodistalmargin unarmed;ventrolateralmargin gener
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Fig. 2. Catapaguroides tanseiaesp.nov.,holotype,male (sl1.8 mm),CBM-ZC 12095.A,rightchela,dorsalview (setae omitted);B,rightcheliped,mesialview;C,same,lateralview;D,carpusofrightcheliped,dorsalview (setae omitted).Scale bar:1 mm.
ally convex,with 2 smallspinesdistally (distalspine smaller than proximal spine); ventromesial margin also convex,with 1 smallspine distally and row of long setae in distalhalf;ventralsurface strongly c on-vex,with few tuftsoflong setae.Ischium spineless; ventralsurface with prominenttuftoflong setae dis -tally. Coxa with small spine at ventrolateral distal angle.
Ambulatory legs (Fig. 4A, C) long and slender,
rightsecond longest,reaching tip ofrightcheliped. Dactyli1.2－1.3 timesaslong aspropodi,10.0－13.0 timeslongerthan wide,straightin dorsalview,gent -ly curved ventrally in lateral view, terminating in moderately long,slendercorneousclaws;dorsalmar -ginseach with row ofstiffsetae increasing in length distally; mesial faces (Fig. 4B, D) each with row of short to long spiniform setae adjacent to ventral margin;ventralmarginsunarmed.Propodieach with
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A new speciesofCatapaguroidesfrom Japan
Fig. 3. Catapaguroides tanseiaesp.nov.,holotype,male (sl1.8 mm),CBM-ZC 12095.A,leftchela,dorsalview (setae omitted);B,leftcheliped,mesialview;C,same,lateralview;D,carpusofleftcheliped,dorsalview (setae omitted).Scale bar:1 mm.
elongate corneousspine flanked by 3 pairsofmuch shorter spiniform-setae on ventrodistal margin (second)oronly with shortcorneousspine (third);dor -saland ventralmarginswith sparse,moderately long stiffsetae.Carpieach with minute dorsodistalspine; sparse,shortto moderately long setae on dorsalmar -gin.Merieach with 1 minute distalspine on ventr o-lateral margin (second) or unarmed (third); dorsal marginseach with row ofshortto moderately long s e-tae; ventral margins with sparse long setae. Ischia with few setae on dorsaland ventralmargins.Second pereopodswith conspicuousnotch on ventralmargin atarticulation between merusand ischium.
Fourth pereopods (Fig. 1G) semichelate; dactylus with several minute corneous teeth on ventral margin;propodalrasp consisting ofcorneousscales arranged in single row.Fifth pereopodssemichelate. Anteriorlobe ofthoracicsternite 6 (Fig.1H)s ub-semicircular,unarmed,slightly skewed to left,bear -ing moderately shortsetae on anteriormargin. Male with moderately long sexualtube emanating from coxa ofrightfifth pereopod (Fig.1I),directed from rightto left,flattened in distal0.3,curving dor
-sally along leftlateralsurface ofposteriorcarapace. Coxa of left with short, papilla-like sexual tube di -rected anteromesially (Fig.1J),partially obscured by adjacenttuftsofshortsetae.Thoracicsternite 8 (Fig. 1I)with single broad lobe bearing dense shortsetae. Telson (Fig.1K)distinctly longerthan wide,nar -rowed posteriorly in posteriorhalf;no lateralindent a-tions; posterior lobes distinctly asymmetrical, separated by small median cleft; terminal margins strongly oblique,leftwith 3 spinulesand acute outer angle,rightwith 1 spinule and acute outerangle. Female unknown.
Coloration in life. Shield generally orange, with darkertintlaterally;posteriorcarapace translucent. Ocularpeduncle lightorange in distalhalf,whitish in proximal half, with red spots basally; cornea dark gray-brown. Antennular peduncle pale orange; fl a-gella whitish.Antennalpeduncle also generally pale orange;antennalacicle with red spotbasally;flagel -lum whitish. Right cheliped mottled orange; carpus with large red spoton dorsalsurface medially;merus with 3 red spotson lateralsurface.Leftcheliped simi -larto rightcheliped.Ambulatory legsbanded with or
-－６－ ange, red and white; dactyli each with broad red median ring,whitish in distalto median ring,parts proximalto median ring alternated with white and red;propodiwhite in distal0.2 and orange in proxi -mal0.8,each with moderately narrow red ring just proximalto white distalpart;carpigenerally orange, with white tinge distally and red spoton dorsalsur -face medially;merigenerally orange,each with 2 red ringsproximally and distalto midlength.See Fig.5. Distribution.Known only from the type locality in SagamiBay,centralJapan,ata depth of146 m. Housing.Gastropod shell.No association with other invertebrateswasobserved.
Remarks. Catapaguroides is heretofore represented by 28 species worldwide, 26 of which occur in the Indo-West Pacific (Komai and Rahayu, 2013). McLaughlin (2002) summarized the taxonomic his -tory of the genus. Eleven species (40%) were de-scribed only in the lastdecade (Osawa and Takeda,
2004;Komai2009;Komaietal.,2010;Komaiand Raha-yu,2013),suggesting thatinventory ofspeciesofthe genusisfarfrom complete.The presentnew species appearsclosestto C.pectinipes,possibly endemicto the Red Sea.Shared charactersare:cornea normally developed, dilated; antennal peduncle overreaching distalcornealmargin;rightpalm with smalldors ome-sialspines,butotherwise unarmed on dorsalsurface; carpus of right cheliped approximately as long as palm;and carpusofleftcheliped armed with spines (Lewinsohn,1969).Catapaguroidestanseiaesp.nov.is readily distinguished from C.pectinipesby the lack of spineson the dorsalsurface ofthe carpusofthe right cheliped and the possession ofa row ofsmallspines on the dorsomesialmargin ofthe palm ofthe leftcheli -ped.In C.pectinipes,the carpusofthe rightcheliped bearsa longitudinalrow offourtiny spineson the dor -salsurface;and the palm ofthe leftcheliped is un-armed.Furthermore,in the new species,the carpus Fig.4.Catapaguroidestanseiaesp.nov.,holotype,male (sl1.8 mm),CBM-ZC 12095.A,rightsecond pereopod,lat -eralview;B,same,dactylusand distalpartofpropodus,mesialview;C,leftthird pereopod,lateralview;D, same,dactylusand distalpartofpropodus,mesialview.Scale bars:0.5 mm.
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A new speciesofCatapaguroidesfrom Japan
ofthe leftcheliped isarmed with one spine on the dor -salsurface somewhatposteriorto the midlength and one moderately strong spine atthe dorsomesialdistal angle.On the otherhand,in C.pectinipes,the carpus ofthe leftcheliped isarmed with three smallspines, arranged in a longitudinalrow,on the distalhalfof the dorsalsurface,and with a smallspine atthe ven-trolateraldistalangle.The rightsexualtube seemsto be relatively longerin C.tanseiaesp.nov.than in C. pectinipes(cf.Lewinsohn,1969:Fig.14i).
Following the key by Komaiand Rahayu (2013),the presentnew speciesisalso placed close to C.declivis McLaughlin,1997,known from Indonesia.However, C. declivis is characterized by the dactylus of the rightcheliped bearing a weak dorsoproximaland dor
-somesialcrestorridge,a prominentdorsolateralrow ofspineson the rightcheliped carpus,the carpusof the leftcheliped bearing dorsolateraland dorsomesial rowsofspines,and the strong spineson the terminal marginsofthe telson (McLaughlin,1997).
From Japanese waters,the following seven species ofCatapaguroideshave been recorded:C.cristimanus de SaintLauren,1968,C.forestiMcLaughlin,2002,C. fragilis(Melin,1939),C.iejimensisOsawa and Takeda, 2004, C. japonicus de Saint Laurent, 1968, C. longior Komai, Yamada and Shirakawa, 2010, and C. umbla Komai, 2009 (Melin, 1939; de Saint Laurent, 1968; Osawa and Takeda,2004;Asakura,2004;2006;Komai, 2009;Komaietal.,2010).None ofthem hasbeen r e-corded from watersnorth to Boso Peninsula in the Pa-Fig.5.Catapaguroidestanseiaesp.nov.,holotype,male (sl1.8 mm),CBM-ZC 12095,entire animalin dorsalview, showing colorin life.
－８－ cific side. From the Sea of Japan side, only C. japonicus was recorded from the southern part (off Hagi,YamaguchiPrefecture;Komaietal.,2002).All butC.japonicusoccurin subtropicalRyukyu Archi -pelago and/or Ogasawara Islands, though the geo-graphicalrange ofC.fragilisextendsto SagamiBay. Catapaguroides japonicus has been recorded from SagamiBay and Suruga Bay (de SaintLaurent,1968; Komaiand Takeda,2006),in addition to offYamaguchi Prefecture.The presentnew speciesrepresentsthe eighth ofthe genusknown from Japanese waters,but itsactualdistribution remainsunknown atpresent. Etymology. Named after the JAMSTEC research vessel“Tansei-maru”in reference to the greatcontri -butions in documenting deep-sea fauna of waters around Japan. The vessel was retired on January 2013.
Acknowledgments
Ithank Dr.ToshiakiKuramochi(NationalMuseum of Nature and Science, Tokyo) for making possible the author to participate KT07 － 31 cruise of RV “Tansei-maru”. I also thank Drs. Masayuki Osawa (Research CenterforCoastalLagoon Environments, Shimane University)and Joseph Poupin (Institutde Recherche de l’École Navale, Brest) for reviewing the manuscriptand foroffering helpfulsuggestions forimprovements.Thiswork isa contribution from the project“Studieson the Origin ofBiodiversity in the SagamiSea,Fossa Magna Elementand the I zu-Ogasawara (Bonin)Arc”(2006－2010),conducted by the NationalMuseum ofNature and Science,Tokyo.
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Komai,T.,Y.Yamada and N.Shirakawa.2010.A new hermitcrab speciesofthe genusCatapaguroidesA. Milne-Edwards & Bouvier (Decapoda: Anomura: Paguridae)from the Ryukyu Islands,Japan,and ad-ditional record of C. foresti McLaughlin. Zootaxa (2690):32－42.
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A new speciesofCatapaguroidesfrom Japan McLaughlin,P.A.,D.L.Rahayu,T.Komaiand T.-Y.
Chan. 2007. A Catalog of the Hermit Crabs (Paguroidea) of Taiwan. 367 pp. National Taiwan Ocean University,Keelung.
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Türkay,M.1986.Crustacea Decapoda Reptantia der Tiefsee desRoten Meeres.Senckenb.Marit.18(3/6): 123－185. 相模湾から採集されたヒメヤドカリ属（甲殻亜門： 十脚目：異尾下目：ホンヤドカリ科）の１新種 駒井智幸 千葉県立中央博物館 〒 260-8682 千葉市中央区青葉町 955-2 神奈川県三浦市城ヶ島沖の水深 147 mから採集され た雄標本１個体に基づき、ホンヤドカリ科ヒメホンヤ ドカリ属の新種 Catapaguroidestanseiae（新称：タンセ イヒメホンヤドカリ）を記載した．本属には 28種の既 知種が知られるが，本新種はそれらのうち，紅海から 知られる C.pectinipes(Lewinsohn,1969)に最も類似す る．しかし，本新種は，右鉗脚の腕節上面に棘を欠く などの諸形質により，C.pectinipesから識別される． 日本産の本属種としては 7既知種が知られており，本 新種は 8種目となる．
