A New Genus And 2 New Species Of Deep water Hermit crabs (Decapoda, Anomura, Paguridae) From The Southern ocean

13 Pages·1994·3.9 MB·English

by  P A Mclaughlin

PROC. BIOL. SOC. WASH.
107(3), 1994, pp. 469-481
A NEW GENUS AND TWO NEW SPECIES OF
DEEP-WATER HERMIT CRABS
(DECAPODA: ANOMURA: PAGURIDAE)
FROM THE SOUTHERN OCEAN
Patsy A. McLaughlin
Abstract.—K diagnosis ofthe new genus, Bathypaguropsis, is provided, to-
gether with descriptions and illustrations ofthe new species B. yaldwyni from
New Zealand and B. marionensis from Australia. Both new species are inhab-
itants ofdepths in excess of250 m.
Duringongoingstudiesofthehermitcrab ofBathypaguropsis yaldwyni, new species,
faunainthecollectionsoftheNationalMu- and one specimen ofB. marionensis, new
seum ofNew Zealand, Wellington, numer- species, thathavebeendepositedinthe col-
ous lots ofa very distinctive species were lectionsoftheNationalMuseumofNatural
observed. In having 13 pairs oftrichobran- History, SmithsonianInstitution, Washing-
chiate gills and a massive operculate right ton, D.C. (USNM), all other materials re-
cheliped with obliquely articulating dactyl, main deposited in their respective institu-
theyappearedatfirstassignabletothegenus tions, B. yaldwyniin the National Museum
Pylopaguropsis Alcock, 1905. However, of New Zealand (NMNZ), and B. mari-
upon closer examination, it was found that onensis in the Northern Territories Muse-
females lacked the paired first pleopods um (NTM). Shield length (SL), measured
modified as gonopods, that are character- from the tip ofthe rostrum to the midpoint
istic of Pylopaguropsis species. Addition- of the posterior margin of the shield pro-
ally, males are provided with four, albeit vides an indication ofspecimen size; 22 in-
rather reduced, unpaired pleopods on the dicates ovigerous females.
leftside. Males ofPylopaguropsishave only
tMhcrLeaeuugnhplaiinre&d lHefatipgle1o98p9o)d.sI(tAlbceoccakme190a5p,- Bathypaguropsis, new genus
parentthatthesespecimensrepresentednot Fig. 1
only a new species, but a new genus. More Type species. —Bathypaguropsis yald-
recently, one lot of specimens from the wyni, new species.
Northern Territories Museum ofArts and Z)za^«05/5.—Cephalothoracic shield (Fig.
Sciences, Darwin, Australia, was found to lA, B) with central dorsal surface some-
represent a second new species assignable times only weakly calcified; rostrum well
to this new genus. developed. Cardiacsulci(cf Morgan&For-
The specimens have been collected dur- est 1991) extending more than half length
ing the Northern Prawn Cruise (NPC), and ofposterior carapace; area between cardiac
cruises ofthe F.V. Chiyo Maru (CM), R/V sulciandsulcicardiobranchialisatleastpar-
JamesCook(JC), RyV Tangaroa(NewZea- tially chitinous or weakly calcified anteri-
land Oceanographic Institute; NZOI), orly. Thirteen pairs oftrichobranchiae. Oc-
F.R.V. Soela, (Commonwealth Scientific, ular acicles triangular, dorsal surface
IndustrialandResearch Organization, CSI- flattened or slightly convex. Antennal pe-
RO). With the exception oftwo specimens duncle with supernumerary segmentation;
470 PROCEEDESfGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig. I. Diagrammaticcephalothoraxwithstipplingdepictingareasofchitinizationand/orcalcification:eg—
cervical groove; It—linea transversalis; scb—sulcus cardiobranchiaUs; cs—cardiac sulcus. A, Bathypaguropsis
yaldwyni, newspecies; B, Bathypaguropsis marionensis, newspecies. Scaleequals5 mm.
acicle tapering; flagellum with scattered se- late, with propodal rasp consisting of 1 or
tae. more, sometimesincomplete,rowsofscales.
Maxillulewith 1 strongbristleoninternal Males with paired gonopores, each par-
lobe ofendopod; external lobe articulated, tiallymaskedbytuftofstiffsetae; nopaired
not recurved. Maxilla with distal lobe of pleopods or sexual tubes. Four unpaired
scaphognathite subtriangular. Ischium of pleopods on left, with exopods only mod-
third maxilliped with well developed crista eratelywell developed, endopods markedly
dentata and 1 accessory tooth. Stemite of reduced.Femaleswithpairedgonopores.No
third maxilliped unarmed. paired pleopods; left 2nd to 5th unpaired,
Right cheliped massive; chela operculate 2nd to 4th with both rami well developed
or nearly so; propodal-carpal articulation and egg-carrying, 5th reduced as in males.
approximately30°fromperpendicular;dac- Tergite of first abdominal somite with
tyl articulating obliquely with palm. Left chitinous or weakly calcified short rectan-
cheliped moderately elongate, slender; gularplate; tergitesofsomites2-5 indicated
propodal-carpal articulation approximately bytransversebandsoffibrils;tergiteofsixth
30-60° counter-clockwise from perpendic- somite divided by deep transverse furrow
ular; dactyl and fixed finger opening in posterior third. Uropods asymmetrical.
obliquely. Telson with transverse suture; posterior
Ambulatory legs with dactyls and propo- lobes subtriangular; terminal margins
di similar. Fourth pereopods not subche- oblique, unarmed or spinulose.
VOLUME 107, NUMBER 3 471
Gender.—Feminine. 1937, pis. 8-11). Both species appear to be
Etymology. —From the Greek bathys inhabitants ofgastropod shells; however, it
meaningdeep, andpagourosmeaningcrab, is not known at the present time whether
reflecting the deep-water habitat ofthis ge- this positioning is a special shell-use ad-
nus. aptation, orwhether the modification is re-
Remarks. —As alluded to previously, lated to gill grooming.
Bathypaguropsis, shares certain characters
withPylopaguropsis. Theseinclude 13 pairs Bathypaguropsisyaldwyni, new species
oftrichobranchiate gills; simple triangular
Figs. lA, 2, 3
ocularacicles; amoderatelywelldeveloped,
non-recurved external endopodal lobe on Holotype.—9 (SL 10.4 mm), Solander
CM
themaxillule;massive,operculaterightche- Trough,46°30'S, 165°14.4'E, 149, 545-
liped; andsmallleftchelipedwithobliquely 573 m, in shell of Fusitriton sp., 10 Sep
NMNZ
opening dactyl and fixed finger. Bathypa- 1987, coll. R. Stewart, CR8067.
guropsisis immediately distinguished from Paratypes.—l S (SL 4.4 mm), N North
Pylopaguropsis by the absence, in females, Cape, 34°13.8'S, 173°02.9'E, JC JO6/048/
ofpaired first pleopods modified as gono- 81, 375-388 m, 22 Apr 1981, coll. D. S.
pods,thepresenceinmalesoffourunpaired Homing, NMNZ CR8087.-2 S (SL 5.4,
pleopods, and the configuration ofthe dac- 7.6), NE Bay ofIslands, 35°05'S, 174°44'E,
tyl and fixed finger of the right chela, the NPCT36,457^81 m, 10Jan 1969,NMNZ
ventral surfaces ofwhich are convex rather CR8027.-1 S (SL 6.2 mm), offCape Brett
than concave. Although the external en- Light, 35°07'S, 174°43'E, NPC, 402-439 m,
dopodallobeofthemaxilluleinbothgenera 11 Jan 1969,NMNZCR8214.-15(SL5.8
N
is usually moderately well developed and mm), of Gt. Barrier Island, 35°27'S,
not recurved, it is articulated in Bathypa- 175°06'E, NPC, 351-384 m, 10 Jan 1969,
NMNZ
guropsis, but not in Pylopaguropsis. CR8080.-1 9 (SL 3.4 mm), Ran-
The cephalothoracic shields ofboth spe- gatira Knoll, 37°17.4'S, 176°53.6'E, NZOI
NMNZ
cieso^Bathypaguropsisusuallyexhibitsome 0.588, 292-337 m, 23 Jan 1981,
amount of reduced calcification; however, CR8129.-1 3 (SL 8.3 mm), E of Mayor
itisneitheruniformindegreenorconsistent Island, 37°20'S, 176°28.0'E,NZOI R.99, 22
NMNZ
in pattern. Analogously, the areas of the Jan 1979, CR8151.-1 S, 2 2(5.2-
posteriorcarapacebetweenthecardiacsulci 5.9 mm), 22 km east Alderman Island, 15
andthe sulcicardiobranchialis aretypically km north Mayor Island, 410-415 m, Jul,
chitinized orcalcified, the extent appearing 1987, coll. R. Macgrath, NMNZCR7523.-
NW
to increase with increased body size. Cor- 1 6 (SL 8.5 mm), Westport, 41°24.8'S,
respondingly, the tergite ofthe first abdom- 170°45'E, JC D4, 371 m, 24 Nov 1970,
inal somite is clearly delineated in speci- NMNZ CR8105.-1 3 (SL 11.2 mm), off"
mens of all sizes, but noticeably better PuysegurBank, 46°12.3'S, 165°55.4'E, CM,
calcified in larger individuals. 388—454m, inshellofFusitritonsp., 11 Sep
In the two known species ofBathypagu- 1987, coll. R. Stewart, NMNZ CR7519.-
ropsis, thefifthpereopodsappearsomewhat 1 22 (SL 10.5 mm), Solander Trough,
CM
longer than seen in most pagurids, and in 46°30'S, 165°14.4'E, 149, 545-573 m,
the vast majority of the specimens exam- in shell ofFusitriton sp., 10 Sep 1987, coll.
ined, these appendages were preserved in a R. Stewart, NMNZCR7516.-1 2, 1 ?2 (SL
dorsally directed position above or along 9.5, 9.6 mm), Solander Trough, 46°31.9'S,
sidethecarapacesuchasdepictedin species 165°44.4'E, CM, 320-346 m, in shells of
ofDromia or Hypochoncha (e.g., Rathbun Fusitritonsp., 10 Sep 1987,coll. R. Stewart,
472 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
NMNZ CR7517, 7518.-2 3, 1 2, 1 22 (SL tae; third segment with very strong spine at
8.2-10.0mm),offPuysegurBank,46°35.6'S, ventrodistal margin; second segment with
CM
165°40.9'E, 145, 532-544 m, 10 Sep dorsolateral distal angle strongly produced
NMNZ
1987, coll. R. Stewart, CR8118, into broad, triangular process, terminating
USNM 267573.-1 22 (SL9.8 mm). North- in acute simple orrarely bifid spine, mesial
ern Campbell Plateau, 47°30.5'S, margin unarmed, lateral margin with 1 or
169°14.7'E, CM, 506-529 m, in shellofFu- 2 often widely-separated spines, dorsome-
sitriton sp., 13 Sep 1987, coll. R. Stewart, sial distal angle with acute spine; first seg-
NMNZ CR7514.-2 $ (SL 9.4, 10.6 mm). ment with small spine at laterodistal mar-
Northern Campbell Plateau, 48°05.7'S, gin, ventral margin produced, with 2 or 3
168°32.5'E, CM, 396-406 m, in shells of spines laterally. Antennal acicle usually
Iredalinasp.andFusitritonsp., 13 Sep 1987, reaching at least to middle ofultimate pe-
NMNZ
coll. R. Stewart, CR7513, 7515. duncular segment, stout, slightly arcuate,
Description.—S>hit\d (Figs. lA, 2A) lon- with row of tufts of stiff setae on mesial
gei than broad; anterior margin between marginandterminatingin small spine. An-
rostrumandlateralprojectionsconcave,an- tennal flagellum long, but not overreaching
terolateral margins sloping; posterior mar- outstretchedrightcheliped,eacharticleusu-
gin truncate. Rostrum broadly triangular, allywith3or4veryshort(<1 articlelength)
acute, usually with tiny terminal spinule. setae, and usually additional 1-A longer se-
Lateral projections obtusely triangular, un- tae at least on distal articles.
armed orwith small marginal spinule. Pos- Maxillule (Fig. 2B) with 1 strong bristle
terior carapace with area between cardiac on internal lobe ofendopod, external lobe
sulciandsulcicardiobranchialisweaklycal- moderatelywelldeveloped, articulated, not
cified in anterior half; posteromedian plate recurved. Maxilla (Fig. 2C) with endopod
frequently with transverse band of calcifi- reachingtodistalmargin ofscaphognathite;
cation adjacent to linea transversalis. distallobe oflatterroundlytriangular. First
Ocular peduncles stout, short, halfto % maxilliped (Fig. 2D) with basal segment of
shield length, dorsomesial surface with row exopod generally subrectangular. Third
of stiff setae; comeae not dilated. Ocular maxilliped with very small spine at distal
aciclessimple,triangular,usuallywithsmall margin ofmerus.
marginal terminal spine; separated basally Rightcheliped(Fig. 3A,B)massive,oper-
by width ofrostrum, or approximately by culate. Dactyl broad, slightly shorter to
'A to Vi basal width of 1 acicle. slightly longerthan palm; cuttingedge with
Antennular peduncles moderately long, calcareous margin faintly cusped, terminat-
overreaching ocular peduncles by slightly ing in very small corneous claw and occa-
less to more than entire length ofultimate sionallywith fewadjacent minute corneous
segment; basal segment with small acute teeth; dorsal surface slightly elevated in the
spineonlateralsurfacedistally;penultimate midlineproximally, smooth, slightlypitted,
segment with few scattered setae dorsally or with scattered low tubercles, granules or
and ventrally; ultimate segment with few shorttransverseridges, dorsomesial margin
tufts orwith row ofsetae on dorsal surface; faintlyorweaklycrenulatedandwith 1 large,
flagellum shorter to slightly longer than ul- blunt tubercle proximally, mesial and ven-
timate peduncular segment. tral surfaces with very low, flattened, fre-
Antennal peduncles exceeding ocular pe- quently corneous-capped, blister-like tu-
duncles by '/2 to % length of ultimate seg- bercles. Palm with maximum breadth
ment, but reaching only to distal halfoful- greater than length, exceeding carpus by Va
timatesegmentofantennularpeduncle.Fifth to '/j own length, dorsomesial distal angle
and fourth segments with few scattered se- markedly produced and armed with prom-
VOLUME NUMBER
107, 3 473
Fig. 2. Bathypaguropsisyaldwyni, new species, 3 paratype (SL 10.0 mm), NMNZ CR8118. A, shield and
cephalic appendages; B, left maxillule (external view); C, left maxilla (external view); D, left first maxilliped
(externalview); E, dactylofrightsecondpereopod(mesialview); F,dactylofleftthirdpereopod(mesialview);
G,dactylandpropodusofleftfourthpereopod(lateralview);H,stemiteofmalefifthpereopods;I,telson.Scales
mm mm
equal 5 (A, E, F, H)and 3 (B-D, G, I).
inent simple or multifid spine; dorsomesial bercles, dorsal surface convex, smooth,
margin with irregular row of4 (rarely 2 or faintly pitted, or covered with flattened
3) blunt, tuberculate spines, frequently in- granules and small tubercles, with 1 or 2
terspersed with smaller spines and/or tu- prominent tubercles at proximal margin;
474 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig. 3. Bathypaguropsisyaldwyni, newspecies,Sparatype(SL lO.Omm),NMNZCR81I8.A,rightcheliped
(dorsalview);B,rightchela(ventralview);C,leftcheliped(dorsalview);D,rightsecondpereopod(lateralview);
E, leftthirdpereopod (lateral view). Scaleequals 5 mm.
VOLUME 107, NUMBER 3 475
dorsolateralmarginnotdelimitedormarked duced lateral protuberance. Ischium un-
by single or double row of low, rounded, armed.
tubercles;mesialfacewithscatteredlowspi- Left cheliped (Fig. 3C) not reaching to
nules,tuberclesorgranules;lateralfacecon- base of dactyl of right, slender; propodal
tinuous with ventral surface, with scattered carpal articulation approximately 45° from
granules, low tubercles and/or short trans- perpendicular. Dactyl slightly to halfagain
verse ridges, ventral surface and several longerthanpalm; surfacesunarmedbutwith
large, flattened, blister-like tubercles, often scattered tufts ofshort setae; cutting edges
with corneous surfaces; ventral surfaces of ofdactyl and fixed finger each with row of
dactyl and fixed finger with scattered gran- small corneousteeth in distal halfto %; ter-
ules or very small flattened, frequently cor- minating in small corneous claws. Palm V2
neous-cappedtubercles; cuttingedgeoffixed to % length ofcarpus; dorsomesial margin
fingerwith 2 or 3 weakly delineated calcar- with 1-3 low protuberances or tubercles;
eous teeth, terminating in very small cor- surfacesallunarmed,butwithfewscattered
neousclaw. Carpusequalingoronlyslightly setae, particularly on fixed finger. Carpus
longer than merus, subquadrate when slightly shorter than merus; dorsomesial
viewed dorsally; dorsomesial distal angle margin with 1 strong, acute or blunt spine
depressed and with small spine, dorsome- on dorsomesial margin distally, and row of
sialsurfacewith 1 verystrong, usuallyblunt 3-5 small blunt or subacute spines or tu-
spine distally and frequently single or dou- berclesondorsomesialmargin; dorsolateral
ble rowofmuch smallerspines ortubercles marginnotdelimited. Meruswithunarmed
proximally,dorsalsurfacewithscatteredlow dorsal margin; ventrolateral margin un-
blunt or spinulose tubercles in mesial half, armedorwithrowofverysmallacute, sim-
very short, transverse ridges in lateral half, ple or bifid spinules, ventral surface some-
distal margin with few to several blunt times with 1 or 2 very small spinules and
spines; dorsolateral margin not delimited, usually 1 moderately prominent tubercle
lateral and mesial surfaces with scattered proximally near mesial margin; dorsal and
blunt or spinulose tubercles or granules, ventral surfaces with scattered short setae.
ventral surface with scattered low tubercles Ischium often with 1 well developed tuber-
or granules, strongest in lateral half, ven- cleonventromesialmargindistallyandfre-
trodistal margin unarmed or weakly tuber- quently also with row of moderately long
culate. Merus broadly rounded and sub- setae.
triangularlaterally, with mesial face almost Ambulatorylegs(Figs. 2E, F; 3D, E) sim-
perpendicular; dorsomesial margin un- ilar, but with left second and third pereo-
armed or occasionally with 1 or 2 small pods slightly longer than right. Dactyls 1
spines distally, dorsolateral margin not de- and V3 to nearly twice length ofpropodi; in
limited, dorsal surface with low transverse, dorsal view, straight or very faintly twisted
weaklygranularridges, lateral face smooth, indistalthird;dorsalmarginseachwithrow
slightly pitted, or with short, transverse tufts of long, stifl" setae, mesial faces each
ridges dorsally and scattered tubercles ven- with 2 or 3 sparse rows oftufts ofshort to
trally,ventrolateralmarginwith 1 or2strong moderately long setae, sometimes replaced
acute spines at distal angle and few smaller byshort, stiff"andspiniformbristlesinlarge
spines or tubercles proximally; ventrome- individuals (SL 10.0 mm); lateral face with
sial margin unarmed or with 1 or 2 smaller fewtuftsofshortsetae;ventralmarginseach
spines at distal angle; ventral surface with with row of 15-31 corneous spines and few
scatteredgranules ortubercles, 2 or 3 mod- tufts of setae. Propodi slightly longer than
erately large tubercles on somewhat pro- carpi, each with few scattered setae on dor-
476 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
sal surface, ventrodistal angles each with 1 particularly in chela morphology. In con-
or 2 small corneous spinules, ventral sur- trast to many pagurids where the strength
faces frequently with row ofwidely-spaced ofchela armature decreaseswith increasing
small corneous spinules, at least on second animalsize, tubercles andspinesinB. yald-
andwithscatteredsetae. Carpi%to% length wyni increased in strength and number in
ofmeri; dorsodistal angles each with small largespecimensofbothsexes. Similarly,the
spine, dorsal surface with sparse row ofse- number ofspines on the ventral margins of
tae. Meri and ischia with scattered setae on the pereopodal dactyls increased from IS-
dorsal and ventral margins. Fourth pereo- IS in animals with shield lengths of5 to 6
pods (Fig. 2G) with propodal rasp consist- mm, to 25-31 inanimalswith shieldlength
ingof1 longrowand 1 orrarely2veryshort over 9.5 mm.
to moderately longrows ofcorneous scales;
dactyl with small terminal claw, no preun-
Bathypaguropsis marionensis, new species
gualprocessdetected.Fifthpereopodsmod-
Figs. IB, 4, 5
erately elongate, chelate; chela with dense
tuft oflong setae ventrally. Holotype.—92 (SL 5.5 mm), Marion Pla-
Anterior lobe of stemite ofthird pereo- teau, Queensland, 19°32.85'S, 152°34.8'E,
podssubrectangular,withcentralsemicircle CSIRO sta 0685-30, 470-477 m, 23 Nov
NTM
fringedwith short setae. Stemite offifth pe- 1985, CR006854.
reopods (Fig. 2H) broadlyrectangular, with Paratypes.—2S(SL5.8; 4.7 mm),Marion
2 prominent tufts ofsetae. Telson (Fig. 21) Plateau, Queensland, 19°32.85'S, 152°34.8'E,
withposteriorlobesasymmetrical, leftlarg- CSIRO sta 0685-30, 470-477 m, 23 Nov
NTM USNM
est,separatedbymoderatemediancleft,ter- 1985, CR006854, 267575.
minal margins each with row ofvery small
spinules. Description.—Shield (Figs. IB, 4A) sub-
//a^zYa?.—Occupying shells ofFusitriton triangular; as long or slightly longer than
sp. and occasionally Iredalina sp. broad; anteriormarginbetweenrostrumand
Distribution.—New Zealand. Off North lateral projections somewhat concave; an-
Islandto theeast from northofNorth Cape terolateral margins slightly oblique; poste-
to north of Mayor Island, and to the west riormargintruncate;dorsalsurfacewithfew
and south ofSouth Island from northwest tufts ofsetae. Rostrum long, reaching well
of Westport to the Solander Trough and beyond bases ofocular acicles, acute, with
Northern Campbell Plateau; 272-573 m. very small terminal spinule. Lateral projec-
Etymology.—The. species is named in tionstriangular, usuallywithsmallterminal
honorofDr.JohnYaldwyn,retireddirector spinule.
ofthe National Museum ofNew Zealand, Ocular peduncles stout, short, Vi to %
in recognition ofhis many contributions to shield length, dorsomesial surface with row
the decapod faunas of Australia and New ofsetae; comeae not dilated. Ocular acicles
Zealand. simple,triangular,unarmedorwithtinyter-
Remarks.—Onespecimenindicatedinthe minal spinule; separated basally by width
material examined as "?2" was parasitized ofrostrum, or by halfto % basal width of
byan unidentifiedrhizocephalan. Although 1 acicle.
this was an adult individual (SL 9.6 mm) Antennularpeduncles long, overreaching
with female appearing pleopods, neither ocular peduncles by almost entire length of
male nor female gonopores were present. ultimate segment; basal segment with acute
As is apparent from the description, B. spineonlateralsurfacedistally;penultimate
yaldwyni exhibits considerable variability, segment with few scattered setae dorsally
VOLUME 107, NUMBER 3 477
andventrally; ultimate segmentwithrowof like tubercles. Palm broader than long, ex-
setaeondorsalsurface; flagellumlongerthan ceeding length of carpus by 'A to Vs own
ultimate peduncular segment. length, dorsomesial distal angle markedly
Antennal peduncles exceeding ocular pe- producedandarmedwith 2 or 3 prominent
duncles by halfto % length ofultimate seg- tuberculate spines; dorsomesial margin with
ment, but reaching only to distal halfoful- single or irregular double row ofblunt, tu-
timatesegmentofantennularpeduncle.Fifth berculate spines, sometimes interspersed
and fourth segments with few scattered se- with smalltubercles, dorsal surface convex,
tae; third segmentwith very strong spine at covered with flattened granules and small
ventrodistal margin; second segment with tubercles, with 1 or 2 prominent tubercles
dorsolateral distal angle strongly produced at proximal margin; dorsolateral margin
into broad, triangular process, terminating rounded, tuberculate, becoming more dis-
in acute spine, usually 1 or 2 spines on me- tinct and crenulated on fixed finger; mesial
sial margin (absent in holotype) and 2^ on facewithscatteredlowtubercles,lateralface
lateral margin, dorsomesial distal anglewith continuous with ventral surface, with scat-
acute spine; first segment with small spine tered granules and few flattened, frequently
at laterodistal margin, ventral margin pro- corneous-capped, blister-like tubercles dis-
duced,with 1 or2spineslaterally. Antennal tallyneararticulation ofdactyl; ventral sur-
acicle reaching slightly beyond proximal faces of dactyl and fixed finger with scat-
margin of ultimate peduncular segment, tered granules or very small, flattened
stout, slightly arcuate, with row oftufts of tubercles; cutting edge of fixed finger with
setae on mesial margin and terminating in 2 or 3 calcareous teeth, terminating in very
small spine. Antennal flagellum long, but smallcorneousclaw.Carpusequalingoronly
not overreaching outstretched right che- slightly longer than merus, subquadrate
liped, each article usually with 3 or 4 very when viewed dorsally; dorsomesial distal
short (<1 article length) setae and occa- angle depressed and armed with spine or
sionally 1-4 somewhat longer. tubercle, margin with strong spine distally
Maxillule (Fig. 4B) with 1 strong bristle and 1 or2tuberclesorbluntspinesindistal
on internal lobe ofendopod, external lobe half, occasionally with oblique row of4 or
moderatelywell developed, articulated, not 5 spinesindistalhalfandfewlowspinulose
recurved. Maxilla (Fig. 4C) with endopod tubercles or blunt spines on or near dor-
reaching distal margin of scaphognathite; somesial margin proximally, dorsal surface
distallobeoflattersubtriangular. Firstmax- with scattered low blunt or spinulose tu-
illiped(Fig. 4D)withbasalsegmentsubrect- bercles, often most prominent in distal half
angular. Third maxilliped with small spine and very short, transverse ridges; dorsolat-
at distal margin ofmerus. eral margin not delimited, lateral and me-
Rightcheliped(Fig. 5A,B)massive,oper- sial surfaces with scattered blunt or spinu-
culate. Dactyl broad, shorter than palm; losetubercles, strongestneardistalmargins,
cutting edge with 1 large fused or 2 or 3 ventrodistalmarginwithrowofsmall,blunt
distinctcalcareousteeth, terminatinginvery or subacute spines or tubercles. Merus
small corneous claw; dorsal surface slightly broadlyandroundlytriangular;dorsalmar-
elevated in midline, and with row of low gin notdelimited, dorsal, mesialand lateral
tubercles, dorsomesial margin with 1 or 2 surfaces with low transverse, weakly gran-
tubercles proximally, weakly crenulate, tu- ular ridges, ventromesial margin with 1
berculate, orwithtransverse ridges distally, strong acute spine at distal angle and few
mesial and ventral surfaces with low, flat- low protuberances or tubercles proximally;
tened, sometimes corneous-capped, blister- ventrolateral margin with slightly smaller
478 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig. 4. Bathypaguropsis marionensis, new species, $ paratype (SL 5.8 mm), USNM 267575. A, shield and
cephalic appendages; B, left maxillule (external view); C, left maxilla (external view); D, left first maxilliped
(externalview); E,dactylofrightsecondpereopod(mesialview); F,dactylofleftthirdpereopod(mesialview);
G, dactyl and propodus ofright fourth pereopod (lateral view); H, stemite ofmale fifth pereopods; I, telson.
mm mm
Scalesequal 3 (A, E-G) and 1 (B-D, H, I).
spine near distal angle and few spinulose Left cheliped (Fig. 5C) not reaching to
tubercles proximally; ventral surface with base of dactyl of right, slender; propodal-
scatteredgranules ortubercles, 2 or 3 mod- carpal articulation approximately 45° from
erately large tubercles on somewhat pro- perpendicular. Dactyl shorter to slightly
ducedmesialhalf. Ischium with fewminute longerthan palm; surfaces unarmedorwith
granules on ventromesial margin. 1 or 2 minute tubercles on dorsal surface