A new genus of hippolytid shrimp (Crustacea: Decapoda: Hippolytidae) for Thor maldivensis Borradaile

11 Pages·1997·4 MB·English

ANEW GENUS OF HIPPOLYTID SHRIMP(CRUSTACEA: DECAPODA;
HIPPOLYTIDAE) FOR THOR MALDIVENSfS BORRADAILE
BRUCE
A.J.
Bruce,A.J. !s>97 0630; A new genusofhippolyiidshrimpfor ThormuldivenstsBorradailc,
Memofnofthe QueenslandMuseum* 42(1) 13-23. Brisbane, ISSN 0079*8836
A newgenus Thorina. isdesignatedtoaccommodatethehippolyiidshrimpThormaldivensis
Borradaile 1915, The new genus is distinguished from Thor particularly by the short,
unidenuue rosirum and the absence of an appendix rnascullna from the male second
pereiopodf with marked sexual dimorphismofthe first pereiopods. First recorded fromthe
Klaldive Islands, the species is sparsely recorded throughout the Indo-West Pacific region
lindnewly recorded fromTanganyika, Mauritius, Seychclle Islands, Western Australia,the
Grcft) Barrier Reef, Pupua New Guinea. Tonga. Cook and Society Islands. Natantia,
tfytidae, Thorina. Indian Ocean, PacificOcean.
A J llrua, Crustacea Section, Queensland Museum, P.O. Box 3300, South Brisbane,
Queensland. 4101. Australia; 17Mav 199b
In his study of the hippolyiid shrimps of the antennulat peduncle, with single small dorsal
Albatross Expedition, Chacc (in press) indicated tooth only. Carapace without carinae; supraor
the anomalous systematic position of Thor bital, non-articulate antenna! spines present, he-
ftioldtvensis Borradaile 1915. He clearly defined patic and pterygostomial Spines absent.
the characters ofthe genus ThorKtngsley s. sir. Aniemiularpedunclewithproximalsegment with
and lists five major characters that distinguish T. moveable plate distally, upper flagellum brush
maldivensis from all other species of the genus like. Scaphocerite mid-laterally unarmed. Eyes
Tfwr, omitting it from his key to the species of well-developed, cornea hemispherical. With
that genus. A new monospecific genus for the elongate acute median process anterior to first
reception of this species is here formally estab- thoracic sternite. Mandible without palpT with
lished. The original description of Thor incisor process, maxillipeds with epipods and
maldivensis provided by Borradaile (1915) con- well developed flagella on exopods. Pereiopods
sisted ofa briefdiagnosis only but a short more without arthrobranchs, epipods orexopods. First
detailed account withan illustrationofa 6 exam- pereiopod with fingers greater than 1/3 of palm
ple was published in Borradaile (1917). This ac- length; fingers without interlocking terminal
count remains the most detailed available ofthis spines, merus with ventral teeth, chelae usually
species, which has been only infrequently re- greatly hypertrophied in some 66. Second pe^-
corded in the zoological literature. reiopod with carpus with6 segments. Propods
Abbreviations used: CL, postorbtlal carapace last 3 pereiopods not multiarticulate. Abdomen
length; MNHN, Museum national d'Histoirc non-carinute, without dorsal teeth, with anterior
Naturelle. Paris; NTM,Museumsand Art Galler- 3 pleura rounded, posterior 2 posteroventtally
ies of the Northern Territory, Darwin; QM. acute, bin abdominal segment withoutarticulated
Queensland Museum. Brisbane posterovenual plate. 6 second pleopod without
appendix masculinaandappendixinterna.Telson
SYSTEMATIC* with 3 pairs o] dorsal spines, 3 pairs ofposterior
spines.
CRUSTACEA
Class
Order DECAPODA TYPESPECIES. ThormaldivensisBorradaile, J9I5.
SuborderNATANTIA ETYMOLOGY FromThor,ahippolyiidgeneric name
inl'ruorderCARII first used by Kingsley, 1878.and-ina (Latin),diminu-
Family HIPPOLYTIDAE tive.Gender, feminine
Thorina gen nov. SYSTEMATIC POSITION. Closely related to
ThorKtngsley, with which most generic charac-
DIAGNOSIS. Small hippolyiid shrimps of sub- tersaresharedand emphasisedby thepresenceof
cylindrical body form. Rostrum very short, sJen- atriangularmobileplateon the distal segment of
der. acute, not exceeding proximal segment of (Ik aniennular peduncle, a feature otherwise
1
MEMOIRSOFTHE OUEfcNSLANOMUShlM
ir only m Thor. Distinguished from Tamarind Mauritius, ncrnidal pools. 24Mqj 1974.
Thorby the greatly reduced rostrum wiih only a coll. AJ. Hukc. QMW2r540, I i . 3 QVlff. :-\ sfQ
singledorsal rkedsexualdintoiphlsittof AJB/l40,Vipengo,Kenya,(--November 1971,reelllui.
3fifrdstppeerreciiooppood1dss,.prreedsuecnecde osfex3uaplaidrismrojfrppheisstmenowf cGAouJlilB.n/e2aAI.JW9.,°3SB4or.uu2tc7he,lSPa(t1ac4uh7t,*hIoM2ro.'ts6t5i*cpoEol.rleeIcOtI-is2oln0a)nm.d..s2Peaaspwpuamarsd.Nr.esveinfv
tnspinesinsteadof I-2pairs,andparticularly. slupc. acuta, 6 November 1980. coll J.M. l
athnedcaopmppelnedtiexaibnsteernncaeoonftahne a6pp2ennddipxlemopaosdc.ulTihnee QMaMfWi2aLI4s5la1n,d, Tianovgiagn.yi9k.a,st2nm.AJ1B4/1N4o1v,emTnbteira R19c7e1r.t
strongly distolaterally spinosc men ofthe hyper- COlI, AJ Bmce, NTMCYOWI S6 I *, sin RH 92 12.
trophic^ 6 1stperciopodsarcalsocharacteristic; Carticr Reef. Western Australia. I2°316TS
but it may benoted that asingle small articulated R!2Cv^2.2"-t:. 10-15m, 9 May 1W2. coll. J.R. Hal
Spine may be present in the Wesl Atlantic SpecfeS R NTMGr<004374, l-'. I Dvig
ThortiobkiniChwcci 1972). InTfiorina,thespinesan: Maaausl Buy, Tuculla, American Samoa, reMef pool.
U.4m. 22July 19S6, 'OperationRuinvh\coll. Rich-
non^articulatedenticularprocesses. mond. NTMCr.004375. 1i. Omuiu Landing. Mil
Cook Islands, reeflagoon,2-3m, II July I9S6. kOper
Thortna maldivensfecomb. now ation Raleigh",coll. M. Richmond. NTMCr.004376,
(Figs 1-6) OVig. 9 , Oholei, Tongatapu. Tougu. reel lag<nm, lift,
14 August 1986, "Operation Raleijzh*. coll M. Rich-
ftermaldivcnsh. torradaile, \$\S 208 20?; 1M17: mond. MNKNNa-6627. 2V 1 1 ovig.). stnS-20, Tahiti.
44)1-402. pi 5fing,6;Kcrop,l9l6; WhEdmcmtt- Society Islands coll O OdirnSA 1982,
IW&
1925 6j 252, 253, flg. 153d; HoJthuls,
S3: 53-tt Bruc 51, Kamettki, e! al., DESCRIPTION. Small hippolytid shrinr
!; SI.col, pi 1 haw ini press. moderately nIciuIci, subcylindrieal body form.
Carapace smooth, with short acute rostrum,
MATERIAL EXAMINED QMWl99t<fc
in DF37, Heron Island. Capricorin Islands, reaching 10 midlength of po>\imal seginoi
Queensland, 3.0ni, 16 Octobcf 1976, coll, D F Fisk anlennular peduncle in dorsal view, without div-
QKeMnWy2aI.43228,De[c£e,mb1eorvi1g972?., cs.in0.A4JmB,/16l2a.goJoand,uiii,n lalineaiboduotrsalleveclarionfa,tiwpiotfh sInifnegrlieorsmoarlblitaalcuatneglloeoiihn
7"ir«.eoU.AJ.Bmce.QMW21439. lo.Aldahiu, lateral view, ventral carina shallow, concave, lat-
Seychelle Wands, 3 November 1964 coral in eral carinac broadly divergent, continuous with
nd reef, tntertidal. coll. AJ. Bruce.IQMVv2J440. supraorbital margin, giving rostrum triangular
2 spms, macerated, R,is EwnLine, Mombasa, Kenya, 8 appearance in dorsal view, with small acute su-
February 1^72. lagoon, in KtiiUffOra, coll. A.J. Bruce. inanrbital teeth, posterior to level OfdOrSjll tooth;
QMW2144I, 15J ovig, 9, sin 140, Kirvvvlii. IsVnva, inferiororbital angle siieiuiy produced, rounded,
1'4&7*S 39*50.761 low water spring tide level, 6
November 1971,coll. AJ Bruce, reefflu underdead with small acute anlennal spine ventrolalerally;
oral QMW2I442. 4 oYlg. AWOVe Island. hepatic and pUrygOStQWlal spines ahsent,
Seyehelle Islands, R v. Manihinc P.r JI2, 20 Aiijium hranchiostegite with anterolateral angk broadly
I reel flat, under dead coral, coll. A.J. Brace. rounded.
VMW2l443,3<i.3ovig. V ParquharM;mU.Scvehelle Abdomen stniHJth. with Snt segmeot slightly
Islands, K.V Manihinc, Cr 536,-an AJBffiO, 26Febru- produced postcrodorsally, non-carinale; 6lh seg-
ary 1472. roll AJ, Bruce. QM WJ1444, 1 spins il ment c. 1.33 times longerthan maximal depth. i.\
OS-IVri0yg1A.y3A5'0SKrsa3t.9nccQ4AlJ4tH.(/VAKEJt,.;B.1rmRu.acfe2i7.IQwFaeMtbiruuWca2,rIMy4o41m59b7,a1s.asI.pfmjKf(eWfnnj,y?a>i,,n 0p.o7steortulcaatcrraaplacaendlenpgotshierinovc6n,traQl.55ang,rl>es?iacwuitteh,
sin Y1B/99, Rits iwaiine. Mombasa Kenmi 4-04,o\s pi)steroventral angle non articulate, first 3 plenr.i
i.2'E. O.Sto, Janum 1971 broadly rounded, not markedly enlarged in
Sftin'r:iAltIoBp/ar1u5.7c,oHJ.adAiJn.iI,BrKuecney.aQ.M4"W'12J1.4O4'S6,I 3i?I *OiV3i5g..5'i& opvosllgeertoovuesntvrai-: a4nighleitsi!-:bir5o''a^dploystaecruitoe.rlyproduced,
QM
;.n,,,, 19 MafCh 1972, il>COrdl*, coll.AJ. Bruce. Telson c. 1.5 times length of 6th abdominal
W21447, If*. 1 OVig an A.iB/166. Bamburi, segment in 6 1.3 times in 9, subequal tocuru
cMioesmlb.aUsSaA,ugKuesntya1.9734,°0c0ol.l5.,ASJ,39BQr4u5c.e0.,EQ1MouWte2r14r4e8e,f pthaacne laenntgertihorin,wcid,tch.,0.l7at5erianl ?ma. r2g.6inlsimseusWIni.raT
2 jiiv-, 5tn AJB/119, Has Iwatme, Kenya, 4g posteriorly convetgeni, posWfjnc margin angular.
DI.I5"S39°43.iST; 2m, 27July 1971.ed-eolU'epreW
csthnanAnJelB,/1In3*P.avJaodminitolKlenAyaI., B4m°c21e.SQ'MSW329J°43449..y&1 !0-. dwci^lrlsialRCsUpiUnems._'ailti;0.i.n4.pr0o.c6esasn,dWOilllSiali ptaeilrssonoflesnigiutihl,l
"m.oiaeriiigivon,incoral JNovcinbcrI97l.col|, ^ pusicnor margin with 3 pans of spino., lateral
I
Bruce, (autlnu's collection), I Kptii, soi AJH/t8la, spines small, subequa! lo ikirsal spines, EUtcrmc
A NEWGENUS OF HIPPOLYTIDSHRIMP 15
FIG. I. Thorina maldivcnsis (Borradaile). d. Aldabra Island (upper) and ovigenous 9, Heron Island (lower).
Scale in mm.
diate spines c. 3.0 times as long as lateral spines, ment short, broad, with articulated triangular
submedian spines slender, plumose, twice length plate dorsolaterally; upper flagellum with proxi-
oflateral spines. mal 12-13 segments stout with dense tufts of
Antennuie withproximal segment broad,about acslhctascsdorsolaterally,distal flagellumwithc.
as wide as long, wiih stout acute tooth at 0.6 of 5slendersegments; lowerflagellumslender,with
ventromedial margin, stylocerileelongate, acute, c. 20 segments.
exceeding length of peduncle, with small an- Antennawithbasiceritestout,withbroadacute,
terovertedprocessproximodorsally;statoeyslob- ventrolateral tooth; carpoccrite stout, sub-
solete; intermediate segment short, broad, with cylindrical, extending to about end ofantennular
acute non-articulated lateral process; distal seg- peduncle, flagellum short, filiform c. 3.5 times
16 MEMOIRS OFTHEQUEENSLAND MUSEUM
FIG. 2. Thorina maldivensis (Borradaile). Ovigerous 9, Heron Island. A, anterior carapace and appendages,
lateral; B, same, dorsal; C. rostrum and anterior carapace, lateral; D, antennule, dorsal; E, same, peduncle,
ventral; F, antenna;G,eye,dorsal; H, 2nd pereiopod; 1,3rdpereiopod;J, uropod; K,telson; L, same, posterior
spines,dorsal spine (inset).
ANEWGENUS OF H1PPOLYT1D SHRIMP
17
mm
0,5
FIG. 3. Thorinamaldivensis(Borradaile).Ovigerous 9, Heron Island. A, mandible; B, same, molarprocess;C,
same,incisorprocess;D,maxillula;E,same,palp;F,maxilla;G,same,palp; H, Istmaxilliped,medianprocess
ofanteriorsternite stippled: I, 2nd maxilliped; J,3rd maxilliped; K, same,terminal spinesofdistal segmentof
endopod.
IX MEMOIRS OFTHHQUEENSLAND Ml 5EUM
carapacelength Seupnoeenu- EMtenitintgwell he segmenl in A and terminal segment onl\ in S lr
>vmtJ sioui purl 61 upperantennular flagellurn. c. 8, terminal segment c. 7.5 times longer thai;
Z.5 limes longer than maximal width, situated at central width, subcylindncul, slightly flattened
>"i IcTOiih.uipermgdisUillyuoroundeddisial ventrally with numerous transverserowsofshort
lamella, distinctly exceeding tip of stout dis- spines, distally obliquely truncate, with 6 stout
to!utcrul loOthi situated at& 0*8ofstraight latenil spines; penultimate segmenr c (fc3 ' f terminal
margin lengUi. segment length, twice as long as wide, with
Eye wcil developed, with large well pigmented groups ol short spiniform setae medially, long
globular cornea, diameter :. 0.33 of carapace selae laterally, ischiorneral segment fused sviib
length in male. 0.4 in 9. withconspicuousdursal basis, combined segment subequal to terminal
Ocellus; stalk sloul.compressed. segment length, moderately bowed, compressed
proximally, expanded distally, lateral margin
Mouthparts generally simitar to those of thor with c. 9 spiniform setae, distolateral angle with
gstpielcaiiesm.edLairagnepalcautet,ecanotmeprrieorssteod1isrtaftthSoVrfiarcsiectrsilaenr-- msiendgilaelllyo;ngbasstirsaisghhtons.pien.e0w.2itohfsahonrttepaecnuulletiLmtiaOttfei
nitc, occluding space between coxa) er*dites of segment length, medial margin slightly bilobed,
first maxilliped. Mandible without pulp; 0>ola? lateral border with small robust rounded epipod;
process stout, obliquely truncate distally. with without arthrobranch. 6 third maxilliped similar
marginal setae and small denticles; incisor pro-
to 9, exceeding carpocerile by penultimate and
cess slender, distally oblique, with h small acute
terminal segments.
teeth. Maxillula with short, feebly bilobed pulp
upper lobe wnh slender simple seta. lower lobe First peroiopods showing marked sexual di-
with stouter spiniform seta; upper lacinia larger, uiurphisiii.smajl in 9 ¥ .greatly hyperirophied in
oval, with numerous short spines distoventrally some 6 S In ? 9, exceeding basicerite byabout
lower lacinia small, short, with several long carpusandchela; chela c. 0.5 ofcarapace length,
with palm subeylindrieal, slightly swollen proxi-
spiues distally. Maxilla with slender, tapering
/.tip. with single spiniform terminal seta, short mally. with few short pectinate cleaning setae
| lorsal seta and medial seta, dLslal proxtmovcntrally, feebly compressed distally, c.
2.4 times longei than proximal depth, smooth.
cntDlc well developed, deeply biiobexl, densely
setose medially, proximal endrle feebly devel- fingers about 1/2 palm length, stout, tapering
oped, slightly bilobed, with Few lung setae. distally, with sharp medial culling edges, dactyl
Scapfto&nairrite well developed, c. 3.0 times with 4 stout non-comified terminal teeth, fixed
t ihan central width, posterior lobe small, fingerwnh3,central toothenlarged with laminar
anterior lobe large, with median margin slightly lateral expansion; carpus c. 0.4 of enela length.
• *i iSflfVe First maxillipedwiih2-scgmented palp, 2.5 times longerthan distal width, tapered proxi-
diMal segment c. 2.5 times longer than wide, mally. smooth, unarmed, with several cleaning
sparsely setose medially, proximal segment setae distoventrally; merus c. 0.95 of chela
broader dian distal, medial border convex, length, widestatmidlength, 2,8 timeslongerthan
icty sciosc, basal endue broad, angular, me- central width, with acule ventrolateral tooth dis-
LflaJ margin with dense shon setae; coxal endite tally, proximal ventral margin with single small
ex, medial margin with sparse, coarse, long sginiferouft tubercle; ischium c. 0.55 of obela
l1umose setae; exopod with well developed fhi- length, compressed, 2.2 times longer than wide,
gellum with numerous plumose setae distally, slightly broader distally than proximally. with
t -Mi-lean lobe small, with numerous plunvnsc single small preterminal distowrttral spicule;
marginal setae, epiptxt large, triangular, leeblv basis and coxa without special features; without
bilobed. Second maxilliped with dacrylai exopod. Hypertrophic male chelae slightly un-
ticm sburii narrow, with numerous shon. equal, similar, c. 0.25 ol carapace length, with
spines, propodal segment large, broad, dis'.nmed- palm subeylindrieal, without cleaning setae pro-
ial hortlet with numerous long spinc>; carpusand ximoventrally, subunil'orm, c, 5 5 times longer
ischiomcrus tiormal, basis with medial margin lhan central depth, ventromedially tubercuhu-,
icavafc dorsal and ventral medial borderswith rlngerse 03ofpalm length,stout,deflexed, with
numerous long slender setae, exopod normal, numerous long stiffsetae, tapering distally. with
coxa medially produced laterally with small sharp strongly concave culling edges, wiih Stool
I |i mgate epipod bearing small podobranchante- hookedtipscrossing distally,dactyluswiihsingle
riorly. Third maxilliped robust, exceeding cat large acute tooth proximally. fixed linger with
poeentc by about terminal and hall penultimate smalleracute tooth moredistally, eaipuse. S^i
ANEW GENUS OF HIPPOLYTID SHRIMP
19
FIG. 4. Thorina maldivvnsis (Borrudaile). Firsi pereiopods. A, ovigenous 9, Heron Island, CL 2.2 mm: B, d
Heron Island, CL2.3mm; C, o\Aklabra Island, CL 2.2mm; D, J, Aslove Island, CL 2.4mm.
chela length, 3.3 times longer than distal width, subcylindrieal, c. 2.3 times longer that central
tapered proximally, feeblytuberculate ventrome- width, with few setal tufts distally, fingers c. 0.6
dially, unarmed, without cleaning setae dis- ofpalm length, slendertapering, 3.0limes longer
loventrally; merus c. 0.9 of chela length, thanproximal depth,cuttingedgessharp,medial,
subcylindrieal, 6.0 limes longer than central tips with 3 acute spines on dactyl, 2 spines and
width, ventrolateral surface tuberculate, with nu- shorttoothon fixed finger;carpus2.5 timeschela
merous small acute distally directed tubercles, length, 12 times longer than wide, 6-segmcnted,
with several (3-6) large stout acute preterminal segments in ratio of2: 1:3.4: 1.9: LI: 1.6, first2
teeth distolaterally, dislovenlral angle rounded; segments poorly separated, distal segment with
ischium obliquely articulated with merus,c. 0.27 transverse row oflong serrulate setaedistoventr-
of chela length, compressed, distally expanded, ally, merus c. 1.75 times chela length, 6.3 times
2.0 times longer than greatest width, dorsally lunger than central width, 6.0 limes longer than
carinateproximallywithc 8-9denticlesortuber- wide, simple; ischium 0.9 of merus length, 5.3
clesandlongstifferectspiniformsetae; basisand times longerthan wide, with 2 long simple spini-
coxa robust, without special features; without form setae proximoventrally; basis and coxa
exopod. Intermediate males with similar but without special features.
smaller and less robust chelae, less spinose and Ambulatory pereiopods moderately robust,
tuberculate, more closely resembling 9 chelae. third pereiopods with slight sexual dimorphism.
Second pcreiopods slender, exceeding car- 2 thirdpcrciopod exceeding carpocerite by pro-
pocerite by carpus and chela in 9. by chela and pod and dactyl; dactyl c. 0.27 ofpropod length,
3 distal segmentsofcarpusin d\chelawithpalm 2.6times longerthanproximaldepth, stout,com-
20 MEMOIRS OFTHEQUEENSLAND MUSEUM
A.IM
FIG. 5. Thorinamaldivensis(Borradaile).Ovigerous 9,Heron Island. A,firstpereiopodchelaanddistalcarpus;
B, fingers ofchela, lateral; C, same, medial; D, same, tipoffixed finger; E, same, medial ischiomeral spines;
F, 2ndperiopod,chela;G, same, fingers; H, same,distal fingers,dactyl above; I, same, medial ischial spine;J,
2nd pereiopod, chela. K, third pereiopod, propod and dactyl. 6*. Heron Island. M, 3rd pereiopod, propod and
dactyl. N, major2nd pereiopod, fingers. O, minor2nd pereiopod, same.
pressed, distal end c. 0.6 ofproximal depth, with propodc. 0.8ofcarapacelength,1.5 timeslonger
smaller dorsal ungual spine and larger, stouter than wide, uniform, slightly bowed, ventral bor-
distoventral spine, each c. 0.3 oflength ofdorsal der with 2 larger distoventral spines, 5 ventral
borderofcorpus, ventral margin with twospines; spines,decreasing in sizeproximally,dorsalmar-
ANEWGENUS OF HIPPOLYT1D SHRIMP 21
FIG. 6. Thorinamaldivensis(Borradaile).Ovigerous 9, Heron Island. A. 3rd pereiopod. dactyl. 6\CL2.3mm,
Heron Island. B. 3rd pereiopod, dactyl. C, 1st pleopod. D. same, endopod. E, 2nd pleopod. F, 3rd pleopod,
endopod. d, CL2.4mm, Aldabra Island. G, 3rd pereiopod,dactyl. H, Isi pleopod. I. 2nd pleopod.
gin sparsely setose; carpus c. 0.36 of propod 0.85 of 3rd merus length. Male 3rd pereiopod
length, unarmed; merus robust,c. 0.72 ofpropod exceedingcarpocerite bypropod anddactyl, with
length, 3.2 times longer than central width, with slight sexual dimorphism; propod slightly ex-
articulated dislolateral spine; ischium c. 0.68 of pandeddistally in smaller specimen, with 3 pairs
meral length, 2.5 times longer than distal width,
of distoventral spines, dactylus as in 9, with 2
narrower proximally, unarmed; basis and coxa
robust, withoutspecial features; withoutexopod. ventral spines; in larger o\ propod scarcely ex-
4th and 5lh pereiopods similar to 3rd. propods panded distally, with 2 groups of 4 and 5 dis-
slightly longerthan 3rd pereiopod propod length, toventral spines,dactyluswith3additional spines
mcri shorterandmore slender,4thc.0.95and5th on proximal ventral margin.
22 MEMOIRS OFTHEQUEENSLAND MUSEUM
Ovigerous 9 pleopods without special fea- antenna white, filiform flagella transparent. The
tures, basipodite enlarged and expanded, rami Mitiaro specimens were notedby thecollectoras
short, broadly expanded, 2nd to 5th endopods 'translucent, with pink and white mottled head
with appendix interna. Male 1st pleopod with and legs, green tinge to lowerabdomen and tail'
basipodite robust, broad, ventromedially con- and 'translucent, with pink predominating, mot-
cave, coxopodite with uncinate disloventral pro- tled white head and legs', the Tutuila specimens
cess; endopod sublanceolate, c. 0.8 of exopod as 'transparent, with green tinge on lower abdo-
length, 1.6 times longer than proximal width, men, mottled green- pink head and legs', andthe
medial margin straight, setose, lateral margin Tongatapu specimens as 'transparent, with pink
convex, with short plumose setae; exopod c. 3.3 tinge and pink mouthparts, red/white eggs, dark
times longer than wide, with plumose marginal body organs'. A good colour photograph is pro-
setae; 2nd pleopod larger, endopodc. 0.8 ofexo- vided by Kamizake et al. (1988). This shows a
podlength, with plumose marginal setae, lacking semi-translucent pale yellowish shrimp, heavily
appendix masculina and appendix interna, exo- mottled with fine red speckling and scattered
podnormal; thirdpleopodnormal, withappendix whitishpatches, particularly at basesofpleopods
interna at c. 0.4 ofmedial margin length. and base and tips ofcaudal fan.
Uropod with protopodite with large acute lat-
eral tooth; exopod c. 2.5 times longerthan wide, REMARKS. The exact habitat of Thorina
lateralmarginstraight,sparselysetose,withsmall maldivensis has not been established but most
acute distal tooth, with large mobile spine medi- personally collected specimens have been ob-
ally; endopod 0.95 of exopod length, 3.0 times tained from shallow intertidal coral reef pools
longer than wide. witha wide variety ofcorals andothercoelenter-
atesandalgae. Asmanywerecollectedbytheuse
TYPES. The type material is deposited in the of poison, the precise niches occupied were not
collection of the Zoology Museum, Cambridge, observed. Several specimenswerecollectedfrom
United Kingdom. 3 lots of specimens are held coral headsbuttheseassociationsmayhavebeen
(pers. comm., R.C. Preece, 16 August 1995), accidental. Hayashi (1986) records this species
consisting of the following: (i) 1 specimen in from under coral blocks. The species appears to
reasonable condition, from Minikoi, Laccadive be generally uncommon, but Edmondson (1946)
Islands; (ii) 1 specimen in reasonable condition, reported that in Hawaiian waters the species 'is
from Salomon Island, (iii) 2 specimens, with commonamong brown seaweeds neartheshore'.
loose appendages, from Holule Island, Male, The colouration ofthe Jadini specimen does not
Maldive Islands. 2lots ofspecimens, (i) and (iii), appear cryptic and suggests a commensal life-
are noted as co-types. The specimens from style. Where several specimens were collected
Minikoi and Holule, are noted on their record togethertheassociation ismorelikelytobegenu-
cards with 'GardinerColin. Ann. Mag. Nat. Hist. ine. The Papua New Guinea specimens from 10-
(8)XX, p. 208. PercySladenTrust. Exp. XXII pt 20m represent the maximum bathymetric range
3. p400\ The Salomon Islandspecimenisanno- for this species.
tated only 'Gardiner Colin.' All have the acces-
sion numberAR 3.1920. unT-hhyepe6rtrsoppehciiemdenfirfstropmerCeairotpioedrsRebuetfthhaeddiosntlayl
MEASUREMENTS (mm), d, Astove Island: propod and dactylus of the 3rd pereiopods were
distinctly sub-prehensile, the ventral dactylus
postorbital carapace length, 2.3; carapace and
rostrum, 3.3; total body length, 12.5; major first with accessory spines. The 6 from Tutuila pos-
pereiopodchela, 5.5; minorfirstpereiopodchela, sessed only part ofa single first pereiopod, lack-
4O.v8i;g3errdoupser$e,ioHpeordopnroIpsoladn,d:1.p8o;sstoarmbei,tamlercaursa,p2a.c3e. ispnignutlhaete,chweiltah. bTlhuent msepirnuess,waansd rtahtehesrpifneiefbolrym
length, 2.2; carapace and rostrum 3.1; total body setae along the dorsal margin ofthe carpus were
length, 11.8; 1st pereiopod chela, 1.2, 3rd perei- feebly developed, mostly short and slender, with
opod propod, 1.7; same, merus, 1.9. only a single distal long spiniform seta.
The transverse triangular median sternal pro-
COLOURATION. The Jadini, Kenya, specimen cessthatappearstolieanteriorly tothesterniteof
was noted to be an opaque white, except for the thefirstmaxillipedappearsunusual butitisrather
transparent posterior 4th, 5th and 6th abdominal difficult to discern its exact relationships. No
segments and caudal fan; pereiopod bases also similar feature seems to have been reported in
white, meri banded with white; antennule and other hippolytids but a similar, though much