Table Of ContentPROC. BIOL. SOC. WASH.
107(3), 1994, pp. 458-464
GLYPHOCRANGONFIMBRIATA, A NEW SPECIES OF
CARIDEAN SHRIMP
(CRUSTACEA: DECAPODA: GLYPHOCRANGONIDAE)
FROM SIO GUYOT, MID-PACIFIC MOUNTAINS
Tomoyuki Komai and Ichiro Takeuchi
Abstract.—A. new species ofcaridean shrimp, Glyphocrangonfimbriata, is
described and figured on the basis ofone female and one male specimen col-
lectedfrom SioGuyot, Mid-PacificMountains, atdepthsof1300-1312m. The
species resembles G. sicaria Faxon, 1893, and G. vicaria Faxon, 1896, but
differs from them in the anterior second (lateral) carina being anteriorly pro-
duced asalarge tooth, andthedactyls ofthe posteriorthree pairs ofpereopods
bearing a setal fringe on the distal part. The discovery of the new species
confirms the existence ofglyphocrangonid shrimp in the northern hemisphere
ofthe Mid-Pacific.
The Mid-Pacific Mountains between the Glyphocrangonfimbriata, new species
Mariana Islands and the Hawaiian Islands Figs. 1-3
m
rise 2000 to 4000 from theabyssal ocean
floorat depths of5000 to 6000 m. The tops Materialexamined.—HoloXypQ: CBM-ZC
ofseveral guyots ofthe Mountains are cov- 214,ovig. female(CL22.5 mm), SioGuyot,
eredwith ocean sediments (e.g., Karigetal. Mid-Pacific Mountains, 18°16.05'N-
1970, Nemoto & Kroenke 1985). In spite 18°15.87'N, 17r20.99'E-17r22.01'E,
of the possibility that there are particular 1300-1312 m, KH-93-1 (R/V Hakuho-
benthic communities endemic to the guy- Maru), sta 7, 31 Jan 1993, ORE type beam
ots, only a few studies on the fauna have trawl of4 m span. Paratype: CBM-ZC 215,
been done (e.g., Wilson et al. 1985). During 1 male (CL 15.5 mm), collected with ho-
JanuarytoMarch 1993,theOceanResearch lotype.
Institute, University of Tokyo, conducted Description.—Body (Fig. 1) moderately
the KH-93-1 cruise of the R/V Hakuho- robust. Integument firm, without pubes-
Maru to investigate the benthic fauna as- cence.
sociatedwiththeseguyots.Thematerialob- Rostrum (Fig. 1) strongly upturned an-
tained from Sio Guyot (18°18'N, 17r06'E) teriorly, overreaching anterior margin of
using ORE type beam trawl, contained two scaphocerite(0.56 timesas longascarapace
specimens ofa new species ofglyphocran- in holotype and 0.72 times as long in para-
gonid shrimp, described and illustrated be- type); dorsolateral margins with 2 pairs of
low. The type specimens are deposited in subequal teeth, anterior pair situated at
the Natural History Museum and Institute, about level ofproximal V3 of rostrum and
Chiba (CBM). The abbreviation CL indi- posterior pair at level of posterior margin
cates the postorbital carapace length. The oforbit; dorsalsurfaceconcave, notseptate,
terminology for the carinae and spines on with median carina extending from apex of
the carapace follows Holthuis (1971) and rostrum to level ofanterior pair of lateral
Chace (1984). teeth; dorsolateral and ventrolateral mar-
VOLUME NUMBER
107, 3 459
Fig. 1. Glyphocrangonfimbriata, newspecies.Holotype,ovig.female(CL22.5mm),entireanimalinlateral
view(top)anddorsalview(bottom).
gins sharply ridged; ventral surface flat- section forming moderately large tooth not
tened, with median carina in distal part. reaching level ofposterior margin oforbit,
Carapace (Fig. 1) with first (submedian) posterior section terminating anteriorly in
carina composed of forwardly directed, blunttooth; posteriorfourth (lateral) carina
small, rather acute tubercles, 5-8 anterior entire. Anterior fifth (sublateral) carina
to cervical groove, 3 posterior to that; me- prominent; posterior fifth (sublateral) cari-
dian area between submedian carinae na less distinct, interrupted posteriorly in
smooth except for few tubercles in anterior few parts. Sixth (submarginal) carina less
area,anteriormostsituatedmediallyorsub- distinct, separatedinto some sections. Space
medially. Anterior second (intermediate) between anterior first and second carinae
carina composed of3 tubercles and strong with2rowsoftubercles; spacebetweenpos-
triangular tooth continuous with dorsolat- terior first and second carinae with row of
eralcarinaofrostrum; posteriorsecond(in- tubercles close to first carina, and scattered
termediate)carinanotentire, marginfaintly tubercles; spaces between posteriorparts of
eroded. Anteriorthird(antennal)carinanot second, thirdandfourthcarinaesmoothex-
continuous with antennal spine, reduced to ceptforfewsmalltubercles. Antennalspines
row of 3-5 small tubercles; posterior third unarmed marginally, more than % as long
(antennal)carinaentireexceptforextremely as, and diverging more than branchiostegal
anterior portion interrupted, not forming spines. Branchiostegal spines overreaching
lobe or tooth anteriorly. Anterior fourth level ofproximal segmentofantennularpe-
(lateral) carina not continuous with anten- duncle, very slightly divergent.
nalspine, separatedin 2 sectionsbydistinct Abdomen (Fig. 1) with teeth and tuber-
notchataboutmidlengthofcarina, anterior cleslow,blunt,orrounded. Firstsomitewith
.
460 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
somelongitudinallyelongatetuberclesalong tae. Carpocerite falling somewhat short of
posterior margin and 1 strong tubercle distal margin ofblade.
slightlyproducedbeyondanterolateralmar- Mouthparts as usual in genus (Fig. 2C-
gin of tergum; median carina thick, with G).Thirdmaxilliped(Fig. 3A-C)quitestout,
sharply ridged dorsal margin, overhanging not reaching beyond anterior margin of
anterior section offirst somite. Median ca- scaphocerite; distal 2 segments (Fig. 3B, C)
rinaoneachsomiteposteriortofirstdivided with strong spines on ventromesial margin
intoanteriorandposteriorsectionsbyblunt and mesial face, mesial face concealed by
notch in second to fourth somites and long setae; ultimate segment terminating in
V-shapedincisioninfifthandsixthsomites. curved, sharply pointed apex; exopod with
Fifthsomitewithposteriorlydivergentsub- articulated distal lash.
median carina on posterior half. Posterior First pereopod (Fig. 3D) incompletely
margins offourth to sixth somitesconvexly subchelate;palm(Fig. 3E)narroweddistally
produced. Pleuron of first somite tapering in dorsal view, with tufts ofstout setae me-
anteroventrallyto blunt point, andthose of sially; carpus short, bearing setae dorsome-
secondto fifth somites with 2 ventral teeth; sially; ischium with broad laminar expan-
teeth on second somite directed ventrally, sionventrally,distalmarginbluntlypointed.
anterior tooth slightly larger than posterior Secondpereopodswithrightmemberofpair
tooth;teethonthirdtofifthsomitesdirected (Fig. 3F) slightly longer and with more car-
posteroventrally, anterior tooth distinctly pal articles than left (right with 26 in ho-
stronger than posterior tooth in third and lotype, 27 in paratype; left with 21 in ho-
fourth somites, and weaker than posterior lotype, 23 in paratype); chela ofeach (Fig.
one in fifth somite. Sixth somite with pos- 3G) barely as long as distalmost article of
teriorly divergent dorsal margin; pleuron carpus,withpalmsomewhatflattened;fixed
with strong posteroventral tooth directed fingershort, terminatingin strongcorneous
posteriorly. Telson (Fig. 1) elongate trian- spine; dactyl broad, terminating in 2 un-
gular,graduallytaperingtosharppoint, 0.65 equal corneous spines; ischium distinctly
timesaslongascarapace, posteriorpartup- longer than merus, ventral margin some-
turned; dorsolateral margin sharply ridged; what expanded. Third pereopod (Fig. 3H)
dorsal surface concave, with strong, acute with dactyl slightly flattened, simple, 0.3
median tubercle proximally. times as longas propodus, dorsolateral and
Thoracic stemite deeply depressed, un- dorsomesial margins ofdistal % with row
armed. Abdominal stemites unarmed. of setae curved backward (Fig. 31); carpus
Eye (Fig. 1) moderately large, with pig- 0.7 times as long as propodus. Fourth pe-
mented cornea. reopod (Fig. 3J) with dactyl similar to that
Antennule(Fig. 2A)withpedunclefalling of third pereopod, distal '/? with marginal
slightly short ofanterior margin ofscapho- setae(Fig. 3K); propoduswith setaeondor-
cerite; proximal segment with stylocerite sodistal margin and with row of scattered
showingasroundedlobe; distal 2 segments, setae on dorsal and lateral surface; carpus
combined, subequal in length to proximal 0.7 times as long as propodus, with short
segment,intermediatesegmentobscuredby setae on extensor surface. Fifth pereopod
longsetaedorsally. Antennularflagella(Fig. (Fig. 3L) with dactyl almost similar to that
1) distinctly longer than peduncle. offourth pereopod, with dorsolateral mar-
Scaphocerite (Fig. 2B) ovate, 0.5 times as ginal setae on distal '/s (Fig. 3M); propodus
long as carapace and 1.65 times as long as withsetaeondorsodistalmargin,lateraland
broad, with small lateral tooth slightly pos- dorsal surfaces nearly naked; carpus 0.7
terior to level ofmidlength, lateral margin times as long as propodus, without setae.
proximal to lateral tooth bearing short se- Branchial formula shown in Table 1
VOLUME 107, NUMBER 3 461
Fig. 2. Glyphocrangonfimbriata, newspecies. Cephalic, abdominalappendages, andmouthparts(leftside).
A-G,holotype,ovig.female(CL22.5mm);H,I,paratype,male(CL 15.5mm).A,antennule,dorsal;B,antenna,
ventral; C, mandible; D, maxillule; E, maxilla; F, first maxilliped; G, second maxilliped; H, endopod ofmale
firstpleopod; I, appendix masculinaand appendixinternaofmale secondpleopod.
Malefirstpleopodwithendopod(Fig. 2H) verse suture, lateral margin convex, termi-
slightlyless than halflength ofexopod, me- nating posteriorly in acute tooth.
sial margin deeply concave; appendix in- Eggs large, ovate, 3.3 x 2.4 mm, 26 in
terna well developed, defined mesially by number.
wide U-shaped sinus. Male second pleopod Coloration (preserved in 10% buffered
with appendix masculina somewhat longer formalin).—Body entirely pale orange, dis-
than appendix interna, bearing more than tal part ofrostrum and telson, and margins
20 longspines (Fig. 31). Uropod(Fig. 1) not ofcarinaedarker.Corneaofeyelightbrown.
reaching posterior end of telson; exopod Eggs reddish yellow.
equalinlengthtoendopod,withfainttrans- Habitat.—Sio Guyot is an exceptionally
462 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
D
Fig.3. Glyphocrangonfimbriata,newspecies.Holotype,ovig.female(CL22.5mm),leftthoracicappendages.
A,thirdmaxilliped,lateral; B, same, distaltwosegmentsanddistalpartofantepenultimatesegment,lateral;C,
same, mesial; D, first pereopod, lateral; E, same, chela, dorsal; F, second pereopod, lateral; G, same, chela,
dorsal; H, third pereopod, lateral; I, same, distal part ofdactyl, lateral; J, fourth pereopod, lateral; K, same,
distalpart ofdactyl, lateral; L, fifth pereopod, lateral; M, same, distal part ofdactyl.
VOLUME 107, NUMBER 3 463
Table \.—Glyphocrangonfimbriata, new species. Branchialformula.
Maxillipeds Pereopods
1 2 3 1 2 3 4 5
Pleurobranchs _ _ _ 1 1 1 1 I
Arthrobranchs - - 2 1 1 1 1 -
Podobranchs - - - - - - - -
Epipods 1 1 - - - - - -
Exopods 1 1 1 - - - - -
large guyot situated at the western edge of produced anteriorly as a strong tooth and
the Mid-Pacific Mountains. The summit is the dactyls of the posterior three pairs of
divided into two flat-topped areas covered pereopodsbearingmarginalsetaeinthedis-
with pelagic sediment (Nemoto & Kroenke tal part distinguish immediately the new
1985); the northern summit, 2820 km^, is species from both G. sicaria and G. vicaria.
greater than the area ofthe Island ofOahu, Other than these characters, G. fimbriata
Hawaiian Islands, at sea level, and the differsfromG.sicariaintheabsenceofrows
southern summitis 230 km^. The sampling ofgranulesoneachintercarinalspaceonthe
station where the types ofthe new species carapace between the posterior second and
were collected is situated in the middle of third lateral carinae and between the pos-
the northern summit. terior third and fourth lateral carinae, and
The silt attached to the end ofthe trawl in having the antennal spine less divergent
was preserved with 10% buffered formalin thanthebranchiostegalspine. Faxon(1895)
for sediment analysis. The ignition loss of (under the name ofGlyphocrangon nobilis)
the silt, which was ashed for two hours in and Wicksten (1979) mentioned that G. vi-
amufflefurnaceat 500°C(Kuwabara 1987), caria possesses transverse corrugations on
was 2.1%. The median particle diameter of thedorsal surface ofthe rostrum, which are
the grain-size distribution is 50. The sea- lacking in the new species.
water four meters above the bottom had a SubsequenttoChace's(1984)work, Ken-
temperature of3.33°C, asalinity of34.56%o sleyetal.(1987)describedthreespeciesfrom
and oxygen concentration of 1.80 ml/1; eastern Australia, G. holthuisi, G. lowryi,
measurementsweremadebyCTD(Sea-Bird and G. navacastellum, and Burukovsky
Electronics, Inc.: Model SBE 91 1 plus)with (1990) further added one species, G. wagi-
rosette samplers (Niskin-type 121). nii, from the Sala-Y-Gomez Ridge, eastern
Etymology. —The Latin fimbriata Pacific.Thesefourspeciesdonotshowclose
(fringed)referstothecharacteristicfringeof affinity with the new species.
setae on dactyl of the third to fifth pereo- The biogeographical distribution of the
pods. previouslyknownspeciesofGlyphocrangon
Distribution. —Known only from Sio has been also reviewed by Chace (1984).
Guyot; at depths of 1300-1312 m. The genus is well represented in the Indian
Remarks.—OasiCQ (1984) reviewed the OceanandthePhilippineregioninthewest-
genus Glyphocrangon and provided a key emPacific.RegardingtheMid-Pacificinthe
tothe 38 speciesthenrecognized. Following northern hemisphere, however, only one
Chace's key, the present new species ap- unidentified species ofthe genus has been
pearscloseto GlyphocrangonsicariaFaxon, recorded from Agassiz Guyot (17°5rN,
1893, and G. vicaria Faxon, 1896, both 178°25'E)byWilsonetal.(1985).Itremains
known from the eastern Pacific. The ante- uncertain, however, whether the new spe-
rior second lateral carina on the carapace cies is conspecific with the species recorded
.
464 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
by Wilson et al. (1985). Further studies on on bytheU.S. Fish Commission steamer"Al-
each guyot of this poorly studied area are batross" during 1891, lieut. commander Z. L.
needed to prove the affinities and biogeo- Tanner, U.S.N., commanding, XV.—Memoirs
graphicdistribution ofthepresentnew spe- oftheMuseumofComparativeZoologyatHar-
vardCollege 18:1-292.
cies. . 1896. SupplementarynotesontheCrustacea.
Reports on the results ofdredging, under the
Acknowledgments supervision ofAlexander Agassiz, in the Gulf
ofMexico and the Caribbean Sea, and on the
We thank Prof K. Numachi, Chief Sci- east coast ofUnited States, 1877 to 1880, by
entist ofthe KH-93-1 Cruise, for his con- the U.S. coast survey steamer "Blake," lieut-
tinuous encouragement during the present commander C. D. Sigsbee, U.S.N., and com-
study, and Dr. M. Matsumasa for his help mXaXnXdVeIrI.J.-BRu.llBeatritnletotf,tUh.eS.MNu.s,ecuommmoafndCionmg-,
in the sediment analysis. We are grateful to parativeZoologyatHarvardCollege30(3):153-
Prof Dr. L. B. Holthuis, Nationaal Natu- 168.
urhistorisch Museum, Leiden; Drs. F. A. Holthuis, L. B. 1971. The Atlantic shrimps ofthe
Chace, Jr. and R. Lemaitre, National Mu- deep-sea genus Glyphocrangon A. Milne Ed-
wards, 1881.—Bulletin ofMarine Science 21:
seum ofNatural History, Smithsonian In-
267-373.
stitution; andtwoanonymousreviewers, for Karig,D. E., M. N. A. Peterson,&G. G. Shor. 1970.
their valuable comments on the manu- Sediment-capped guyots in the Mid-Pacific
script.Thecooperationandassistancegiven Mountains.—Deep-SeaResearch 17:373-378.
bytheofficersandcrewoftheR/VHakuho- Kensley, B., H. A. Tranter, &D. J. G. Griffin. 1987.
Deep-water decapod Crustacea from eastern
Maru are also acknowledged. Australia(PenaeideaandCaridea).—Recordsof
theAustralian Museum 39:263-331.
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