[PDF] Crustacea Decapoda : deep-sea shrimps of the genus Plesionika

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6

PlesionikaBate,1888(Pandalidae)

fromFrenchPolynesia,withdescriptions offivenewspecies

Tin-YamCHAN

2Pei-NingRoad,Keelung,Taiwan,R.O.C.

&AlainCROSNIER

Muséumnationald'Histoirenaturelle

55rueBuffon,75005Paris

ABSTRACT

carideangenus actuallyaseniorsynonym (Burukovsky,1986)is foundinFrenchPolynesia,andthisspeciesisc10selyrelatedtoP.laevis(A.MilneEdwards,

1883)and

1915)alsobelongtothe

typicalPlesionikaandHeterocarpus.The exactdifferencesbetween whichisnear affiliatedto pereiopodIV;

P.poupinisp.nov.,whichisverysimilartoP.

postlarvae

Campagnes

188T.-Y.CHAN&A.CROSNIER

RÉSUMÉ

decapturer décrites mises que spécimens partdesPlesionikaet

Edwards,1881)n'ont

abdominalpeutêtrerecourbée espècessontdécrites sp.nov.quiesttrèssemblableà

Lesautresespècestrouvées

P.fenneriCrosnier,1986,ontététrouvéesetdesinformationsadditionnellessont fourniespourcetteespèce.

INTRODUCTION

"P.carsiniCrosnier,1986"group

P.carsiniCrosnier,1986

P.poupinisp.nov.

"P.edwardsii(Brandt,1851)"group

P.edwardsii(Brandt,1851)

"P.ensis(A.MilneEdwards,1881)"group

P.reflexaChace,1985

"P.laevis(A.MilneEdwards,1883)"group

P.fenneriCrosnier,1986

P.nesisi(Burukovsky,1986)

"P.macropodaChace,1939"group

P.macropodaChace,1939

P.williamsiForest,1964

"P.martia(A.MilneEdwards,1883)"group

P.martia(A.MilneEdwards,1883)

P.semilaevisBate,1888

PLESIONlKAFROMFRENCHPOLYNESIA189

"P.narval(Fabricius,1787)"group

P.narval(Fabricius,1787)

P.spinipesBate,1888

P.flavicaudaChan&Crosnier,1991

P.rubriorChan&Crosnier,1991

P.curvataChan&Crosnier,1991

"P.rostricrescentis(Bate,1888)"group

P.erythrocyclussp.nov.

"P.sindoi(Rathbun,1906)"group

P.sindoi(Rathbun,1906)

P.protatisp.nov.

Affinitiesnotclear

P.payenisp.nov.

P.pictasp.nov.

P.spinidorsalis(Rathbun,1906)

Asshowninpreviousstudiesonthisgenus(e.g.

studiedfurtherinthepresentwork,except fromtheadults.

MATERIALANDMETHODS

R.V.

Keelung(NTOU),theNationalMuseum

Museum,London

exarnined.

Inthelists

ofthecroisesareprintedincapita1letters.

Themeasurementsprovidedare

SYSTEMATICACCOUNT

Plesionikapoupinisp.nov.

Figs1-2,22

1986].

Plesionikasp.nov.3 -POUPIN,1996,pl.4g.

190T.-Y.CHAN&A.CROSNIER

1 022.3mm(MNHN-Na13078).-Rurutu.Stn149,22°27.2'S,151°23.3'W,520m,10.03.1989:2015.6and

21.6
mm(MNHN-Na13077).

Na13122).

510
m,11.12.1987:1 021.1mm,121.1mm(MNHN-Na12520).-Stn164,21°47.3'S,138°55.6'W,360m,

21.06.1989:2 014.2&21.2mm(MNHN-Na13072).-Makemo.Stn68,16°36.0'S,143°33.0'W,510m,

4.06.1988:1 024.0mm(MNHN-Na13073).-Stn317,21°53.8'S,139°1.6'W,500m,19.10.1990:1 020.7mm

(MNHN-Na13075). TubuaiIslands.Raevavae.Stn100,23°55.0'S,147°40.0'W,530m,24.08.1988:1 019.6mm,118.4mm (MNHN-Na13076).

Specimensphotographed.

135°01.6'W,470

m,11.10.1990:1ovig.28.2mm(MNHN). 27.3
mm,317.3-26mm(MNHN).-Maria.Stn72,22°00.0'S,136°17.0'W,430m,10.06.1988:1 025.7mm (MNHN).-Mururoa.Stn39,21°49.3'S,138°46.5'W,470m,2.12.1987:5 018.8-24.1mm,117.8mm(MNHN

Na125)8,transferredtoUSNM).-

Tureia.Stn36,20

0

45.0'S,138°31.0'W,490m,24.11.1987:2 015.6and

20.8mm,1ovig.

22.4mm,113.4mm(MNHN-Na12523)..

Taiwan.Northeasterncoast,Tai·Chi,I-LanCounty,commercialtraw1er,about300m,9.05.1989:1 0 18.8 mm(NTOU).-11.07.1989:1 021.5mm(NTOU,transferredtoMNHN);1 021.1mm,1ovig.23.1mm (NTOU).-1.09.1989:2 020.0and21.2mm(NTOU).-5.03.1993:1ovig.25.4mm(NTOU).-Su-Aou,I-Lan

County,commercial

Islands.Makemo.Stn68,16°36.0'S,143°33.0'W,510m,4.06.1988:1 024.4mm(MNHN).-Mururoa.450m,

7717);1ovig.

23.4mmparatype(MNHN-Na7716).-350-600m,1984:1 015.7mm,allotype(MNHN-Na

7715);1ovig.

(MNHN). paratypes. DIAGNOSIS.-Rostrum1.28-1.61(avg.1.4)timeslengthofcarapace,onlyslightlyrecurved, overreachingthe scaphocerite onthebasal3/5

Islands,Raevavae,stn99,450

m:Lateralviewofcarapace.

PLESIONlKAFROMFRENCHPOLYNESIA191

movable.Eyesub-pyrifonn,maximumdiameterabout115carapacelength, ocellusveryclear.Styloceriteacute, ofdistalmarginofblade.MaxillipedIIIand ofdactyl,propodus, carpusandabout1/7 tooth

1.75timesaslongas

REMARKS.-Asinpreviouspapers

employedasanimportantcharacterfortheidentificationsofthe speciesofPlesionika.However,theuseof ofabdominalsomite ofthis formula postrostral teeth segment/dis-carpal dactylus movable talsegmentarticles

FrenchPolynesia

Taiwan

P.poupinisp.nov.(spottedform).

Onlydata

striped fonn(Table1).Whenrostrallengthisplotted specimens

1.3timesas

specimens asthecarapaceinthestripedfonn.

192T.-Y.CHAN&A.CROSNIER

38
37
36
35
34
33
32
'""'31 30
.....,29

ê28

27
26
25
24
23
22
21
20 19 14 o

Çl"

16 o'.f. ,-.j. 18 0,' 20 o o o o o o :iPpo-+ 0,' o+ + 2224
o ,'.j. 26

28cl(mm)

and thespecimensarefromFrenchPolynesia). +,P.carsiniwithphoto(strippedform,n =14).-D,P.poupiniwithphoto(spottedform,n =13). 0 0 0 0 00 0 00 0 x :tP 0+ 0 x 00 +er 00 0 0+ 38
37
36
35
34
33
32
31

ê30

.....,29

ê28

26
25
24
0 23
0 22
0 li 21
20x 19

1416182022242628cl(mm)

-Il,

PLESIONIKAFROMFRENCHPOLYNESIA193

length thespecimens

Itissignificant

oftheTaiwanese materialareverysimilartothose ofthisgenuswithawidegeographical distribution). =21.1mm)witharelativelylonger rostrum,alsohasanunusualhighnumber ofventralrostral teeth(19),andisprobablyabnorrnal.Sinceno weIlwiththelength

Hencetherostrallength

stripedforrnandanewname, specieswouldprobablyhavebeenimpossible.

Plesionikaedwardsii(Brandt,1851)

Fig. 23
figs2,3b. alsowithfullsynonymy).

194T.-Y.CHAN&A.CROSNIER

thecloselyrelated monly200-400m.

PlesionikareflexaChace,1985

Figs3,24

1996,pl.5a.

Islands.FatuHiva.

Stn61,lO

o

12524).-

138°57.3'W,630

13.7-17.4mm(MNHN-Na

Tureia.Stn36,20

0

152°50.0'W,700

DIAGNOSIS.- AdetaileddescriptionofthisspeciescanbefoundinCHACE(1985),thoughtherearestill (includingappendages),anterior

Eyesblack.Eggsbluish.

20mmcl,and

(0.30-0.46aslongaspropodus- examined).Theshortdactylus theAntillesin

4,pl.16figs1-3).However,theposteriorspineoftheabdominalsomiteIIIisveryoftencurvedupwardsin the

FrenchPolynesianmaterial(87.1

is

Na7865)from

andSeychellesexamined[theratiosare0.10 suchvariationontherelativelength

Furthennore,thedactylus

easternAustralia theArabianSea b

PLESIONlKAFROMFRENCHPOLYNESIA

195

Tubuai,

Polynesia,

ineasternAtlanticspecimens.Thetendencyof

ArabianSea

=27)thaninP.ensisfromtheAtlantic(western =16;eastern =7).However,the cl,n=2and3 =2and3respectively),whilethosefrom rostrum allengthandarmatureoftherostrumareofany taxonomievalue.Nevertheless,theabsence

CHACE,1985).Forthetimebeing,itmaybemore

convenienttousethename thepresence abdominalsomite containedinthe tothecase themoccursintheAtlantic(CHAN&Yu,1991).

196T.-Y.CHAN&A.CROSNIER

materialoccursatdepths

P.ensis).

PlesionikafenneriCrosnier,1986

Figs

4,26-27

Additionalspecimens:

13125).

Eggsmetallicblue

(POUPINetal.,1990).

CROSNIER,

preliminaryidentifiedby resemblancesto

P.nesisi,theshapeoftherostrumis

veryvariableforthespecies theanteriorfourpereiopodsandtheexopod ofeitherP.fenneri ofthesetwo postlarvaeagreequiteweIlwiththose oneortwo ofabdominal

P.fenneri.More

informationonthelarval

Nevertheless,

PLESIONIKAFROMFRENCHPOLYNESIA197

similartotheadults.

DISTRIBUTION.-

etal.,1990). d c

Rurutu,stn146,580

somiteIII;d-e,propodusanddactylus ofpereiopodIII.

Plesionikanesisi(Burukovsky,1986)

Figs5-10,28

Plesionikanesisi-POUPIN,1996,pl.4e.

198
b c

T.-Y.CHAN&A.CROSNIER

a,ovig.

Fangataufa,stn85,780m . -

b,ovig.27.6mm(MNHN-Na 13115)withabdominalpleuronIVpointed,Tuamotu

Islands,Mururoa,stn

Islands,Makemo,stn

Islands,Fangataufa,stn139,720m.

PLESIONlKAFROMFRENCHPOLYNESIA199

0

33'W,800m:ô26.0mm,holotype(MSU).

800

6ovig.

drawn).-

23.6mm;1ovig.27.6mm(MNHN-Na13115,drawn).

Kiribati.

drawn).-750 drawn).

31.1mm.

a b m.-b,18.0mm(MNHN-Na13121),Kiribati,750m;

200T.-Y.CHAN&A.CROSNIER

Madagascar.

5-8(veryrarely

extendingalmosttoposteriormargin moreorlessextending margin generaIly,apair somiteVI;withfourpairs

0.5mmindiameter.

a sea-mount,

13°34'N,120

0

PLESIONlKAFROMFRENCHPOLYNESIA201

ovigerousfemale19.5mmcl. b C> FrenchPolynesia,TuamotuIslands,Mururoa,stn477,800m :c,lateralview ofposteriorpartofabdomen;d,dorsal view ofdistalpartoftelson.-e,ovig.26.7mm(MNHN-Na13118),FrenchPolynesia, TuamotuIslands,

Fangataufa,stn85,780

m:lateralviewofposteriorpartofabdomen.

820,mostly500-700m,for

largevariationsintheshape

Ofthe100specimensexamined,the

posteroventralangle

Thedegree

202T.-Y.CHAN&A.CROSNIER

appeartovaryindependently, sexes(figs5,8-10).Moreover, nodifferenceincoloration hasbeenobservedforthesedeep-waterFrench 1 a b cde m.-c,<.?18.0mm (MNHN-Na13121),Kiribati,750m. characteristicsinterrnediatebetween

Actuallythere

Seychelles

single underwaterseamount,north-east

PLES/ON/KAFROMFRENCHPOLYNESIA203

ofdorsalrostralteeth. _.....<2:.....:2:J h, c, stn3-14,850-800m:1eftside.

FrenchPolynesian

abdominalbossismorepronouncedin carapace.

Thetype

(apparentlyverystraight)andmost oftheadditionalspecimens mentionedby

H.alexandri(i.e.rostrumbrokenand

most mentionedby fonn(sorne specimen presentontheabdominalsomiteIIIandsorne belongs

204T.-Y.CHAN&A.CRaSNIER

MaroccanGulf,

the"P.laevis"group(RAsa,1996:741).

EasternPacine

dcvelopedn=IOO spÎneshort n=1 (0.89)n=2(7.0)n=2n=2(4.5)n=6(7.2)n=2 robust,accessorydevcloped n=6 spinelong spinelong10shon n=19 Philippines0.93-1.106-8 7-94-56.15siender•accessorystrong67%roundeInconclusion,thepresentFrenchPolynesian ismoreoftenrounded,andthe dactyli thedegree those theyhaveamuchlonger,straight inthedifferentIndo-Pacificpopulations,

MarquesasIslands(fig.6a)andKiribati(fig.

6b)havethe rostrumquitesimilartothatoftheSeychellesmaterial.

ThetwoSeychellesspecimensareverysimilar

localityandis

Polynesianspecimenwith

andthetwoSeychellesspecimens (MNHN)as

H.nesisiandH.unicarinatus.

naturalgroup.Thecompleteabsence inclusion

PLESIONIKAFROMFRENCHPOLYNESIA205

DISTRIBUTION.-

Plesionikamacropoda

Chace,1939

Figs11-13,30-31

PlesionikamacropodaChace,1939;

(inpart);1996,pl.4d.quotesdbs_dbs25.pdfusesText_31

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