Description Of The Ghost Shrimp Eucalliax mcilhennyi, New Species, From South Florida, With Reexamination Of Its Known Congeners (Crustacea, Decapoda, Callianassidae)

14 Pages·1994·4.3 MB·English

by  D L Felder

PROC. BIOL. SOC. WASH.
107(2), 1994, pp. 340-353
DESCRIPTION OF THE GHOST SHRIMP
EUCALLIAXMCILHENNYI, NEW SPECIES, FROM
SOUTH FLORIDA, WITH REEXAMINATION OF ITS
KNOWN CONGENERS
(CRUSTACEA: DECAPODA: CALLIANASSIDAE)
Darryl L. Felder and Raymond B. Manning
Abstract.—Eucalliaxmcilhennyi, new species, isdescribedfroman intertidal
sandflatborderingFortPierceInletontheAtlanticcoastofFlorida. The species
is distinguished from known congenerics ofthe Eucalliinae, all ofwhich are
restricted to the western Atlantic. Detailed comparisons are made to E.jonesi
(Heard 1989), from Bimini Harbor, Bahamas. Specimens from Florida were
first thought to represent E. jonesi because of superificial resemblance, simi-
laritiesin habitats, and proximityofcollection localities. Thetwo species differ
fromeachotherandtheircongenericsinanumberofmorphologicalcharacters,
including relative development ofthe front and rostrum ofthe carapace, spi-
nation ofchelipeds, shape ofgonopods, and ventral plating ofabdominal so-
mites. Abbreviated larval development and limited capacity for dispersal are
inferred by the large eggs found on ovigerous females ofspecies in this genus,
and may serve to maintain isolation of regional populations. This would be
consistentwith morphological evidence thatEucalliaxhas extensively endem-
ized within the tropical western Atlantic, even in the absence ofevidence for
major historical disjunctures in appropriate habitat.
Overthelastdecade, wehaveusedyabby (seeFelder&Manning 1986), hasproduced
pumps (see Hailstone & Stephenson 1961, a particularly rich assemblage of fossorial
Manning 1975) to collect extensively from stomatopod, thalassinid, and alpheid crus-
intertidal substrates in the vicinity of Fort taceans. The thalassinids taken from this
Pierce, Florida. Our efforts there have re- small area have included representatives of
vealedanumberofpreviouslyunknown in- Upogebia, Callichirus, Neocallichirus, Bif-
faunal decapods, some of which we have farius, and a new genus (Manning & Le-
described in previous papers (Felder & maitre 1994). Ourcollectionstherehavealso
Manning 1986; Manning & Felder 1989, included infrequent occurrence oftwo spe-
1992). Materials from this region have also cies ofghost shrimp that we assigned to a
provided a basis for systematic revisions new genus, Eucalliax Manning & Felder,
and new distribution records, especially for 1991. Oneofthesespecies, perhapsthesame
members of the Callianassidae (Manning asthatpreviouslyreportedfrom south Flor-
1987, 1993; Manning& Felder 1986, 1991; ida as ^'Eucalliaxguadracuta'" (Biffar 1971;
Manning & Heard 1986; Manning & Le- specimen destroyed by fire), we have ten-
maitre 1994). tatively grouped with the 'Eucalliax quad-
One of our collecting sites within the racuta complex' until such time as we can
southern Indian River lagoon, a small in- complete further comparative studies from
tertidal sandflatjustinside Fort Pierce Inlet throughouttherangeofthatgroup. Theoth-
VOLUME NUMBER
107, 2 341
er, allied toE.jonesi(Heard 1989) from the 1986, coll. R. B. Manning, D. L. Felderand
nearbynorthernBahamasandE. cearaensis W. D. Lee, 1 ov 2 (CL 10.3 mm), USNM
from Brazil (Rodrigues & Manning 1992), 2671 13; station RBM FP-86-2, voucherfor
is herein recognized as a new species. color photo, 1 1 Aug 1986, coll. R. B. Man-
Material examined is listed by location ning, D. L. Felderand W. D. Lee, 2 9(1 ov,
followedbydate, collector, numberofspec- 1 mutl; CL 11.6 mm, 10.5 mm), USNM
imens per sex and condition (imm = im- 267114; station RBM FP-86-3, 12 Aug
mature, mutl = mutilated, ov = ovigerous), 1986, coll. R. B. ManningandD. L. Felder,
and, ifapplicable, museum number. Size is 1 2 (CL 10.9 mm), USNM 2671 15; station
expressedaspostorbitalcarapacelength(CL) RBM FP-86-4, 12 Aug 1986, coll. R. B.
measuredinmillimeters(mm),exceptwhere Manning, D. L. Felder and W. D. Lee, 1 9
compared as total length under "Remarks" (CL9.9 mm), USNM 2671 16; station RBM
section. The holotype and some paratypes FP-86-6, 14 Aug 1986, coll. R. B. Manning,
ofEucalliax mcilhennyi have been depos- D. L. Felder and W. D. Lee, 3 9 (1 ov, 1
ited in the National Museum of Natural mutl; CL 11.2, 11.2, 11.0 mm), USNM
History, SmithsonianInstitution, Washing- 267117; no station number, 4 Jun 1993,
ton,D.C. (USNM). Paratypeshavebeende- coll. D. L. Felder, 1 ov 9 (CL 9.7 mm),
posited in the University of Southwestern USLZ 3537; station RBM FP-88-3, hard
Louisiana Zoological Collections, Lafa- packed sand along shore, 27°28.2'N,
yette, Louisiana(USLZ). Inadditiontotype 80°18.2'W, southsideofCoonIsland, north
materials of E. cearaensis and E. jonesi shoreline ofFort Pierce Inlet, Indian River
availableattheSmithsonianInstitution,the lagoon, St. Lucie County, Florida, "with
paratype ofEucalliaxjonesi was obtained Pinnixa;' 21 Apr 1988, coll. R. B. Man-
on loan from the GulfCoast Research Lab- ning, W. D. Lee, M. Schotte, and C. King,
oratory (GCRL) in Ocean Springs, Missis- 1 S (CL 7.5 mm), USNM 2671 18.
sippi,andthetypesofEucalliaxquadracuta Diagnosis.—Rostrum broad, weaklypro-
(Biffar, 1970) were obtained on loan from duced. Carapace dorsally lacking strong,
the Museum ofComparativeZoology, Har- longitudinal ridges. Antennal peduncles
vard University, in Cambridge, Massachu- overreaching antennular peduncles. Che-
setts. lipeds with hooked marginal spinules on is-
Eucalliax Manning & Felder, 1991 chium, lackingacuteteethorspinesatdistal
corners of carpus. Male first pleopod
Eucalliax mcilhennyi, new species
originatingfromdistinctovoidventralplate
Figs. 1-6
on abdomen, terminallybifurcate, with sin-
RBM
Type material.-Station FP-89-4, gle, short subapical process.
sandflat with sparse seagrass, ITll.TN, Description.—Dorsally, carapace much
80°18.7'W, south side ofFort Pierce Inlet, less than (about %) combined lengths ofab-
north side of US Highway AlA causeway dominal segments 1 and 2 (Fig. la). Frontal
between Fort Pierce and South Hutchinson margin of carapace with broad, triangular
Island, Indian River lagoon, St. Lucie rostrum; rostrum acute terminally and
County, Horida, 11 Aug 1989, coll. R. B. flanked by weakly excavate shoulders (Fig.
Manning,R. Brown, andW. Lee,$holotype 2a) forming anteriorly produced promi-
USNM
(CL 10.1 mm), 267112; (same site nences just lateral to margins ofeyestalks;
as holotype, except where otherwise indi- rostrumextendinglessthan Vivisiblelength
RBM
cated) station FP-85-4, voucher for ofeyestalksindorsalview,ventrallybearing
color photo, 23 Jul 1985, coll. R. B. Man- tuft ofsetae, longest ofwhich extend ante-
ning and D. L. Felder, 1 S (CL 9.0 mm), riorlybetweeneyestalkstocornea. Carapace
USLZ 3538; stationRBM FP-86-1, 1 1 Aug lacking distinct dorsal oval and cardiac
342 PROCEEDINGSOFTHE BIOLOGICALSOCIETY OFWASHINGTON
Fig. \. Eucalliax mcilhennyi, new species, from Fort Pierce Inlet, Florida, paratype ovigerous 2 (CL 11.6
mm) USNM 267114: a, Lateral view; b, External surface ofright(major) chela. Scale lines indicate 5 mm.
prominence; lacking rostral carina except duncle shorter than and not so heavy as
for slightly raised postrostral area between antennal peduncle; basalarticle laterallyand
pairs ofpostrostralpunctae. Cervicalgroove ventrally inflated to accommodate stato-
evidentassuture,disjunctatdorsalmidline, cyst,openingtowhichisoccludedbyclosely
extending anteroventrally to complex net- set fan of anteromesially directed setae
work ofsutures in posterior % ofcarapace; overlain by eyestalk; second article slightly
one branch from this point continued an- longerthan basal article, third article about
teriorly as weakly carinate, sinuous, longi- %lengthofsecond; secondandthirdarticles
tudinal suture, of which longest tract ter- with ventrolateral row oflong, ventrally di-
minates anteriorly in antennal notch of rected setae, continued onto ventral ramus
carapacemargin. Strong,raisedhepaticboss offlagellum; rami offlagellum about equal
in anterior Vs ofcarapacejust dorsal to cer- in length, near5 timeslength ofthirdarticle
vical suture. Linea thalassinica strong, par- ofpeduncle; ventral ramus ventrally setose,
allel to midline of carapace over most of line oflongsetation ventrolaterallyand line
length, diverging slightly posterior of car- of slightly shorter setation ventromesially;
diac suture. Cardiac suture well defined, in- dorsal ramus primarily with sparse short
complete across dorsal midline ofcarapace. setae, subterminal articles ofdorsal ramus
Eyestalks dorsally flattened, length equal heavier than those of ventral ramus, and
to or just greater than 2 times width, in endowed with thick line ofventral aesthet-
dorsal viewreachingbeyondbasal antennal ascs. Antennalpedunclemorethan 1.5 times
article; mesial surfaces broadly triangular, length ofantennular peduncle; basal article
flattened so eyestalks fit closely together at with dorsolateral carinabearingregularline
midline;anterolateralmarginofeyestalkar- of fine setae above laterally produced ex-
cuate, joining mesial margin anteriorly in cretory pore; second article with deep, di-
narrow, upturned tip; pigmented region in agonal ventrolateral furrow, distally with
distal '/2 ofdorsal surface, area ofdark pig- fieldoflongsetaebelowventrolateralsuture
mentation variable, sometimes exceeding and another on dorsolateral surface, broad,
the weakly evident corneal surface; some- articulated dorsal scale at joint with third
timeswith 1 ormoresetosepunctaedorsally article; third articleelongate, slightly longer
near midlength ofeyestalk. Antennular pe- than fourth orcombinedlengthsoffirsttwo.
VOLUME 107, NUMBER 2 343
Fig. 2. Eucalliaxmcilhennyi, newspecies, from Fort Pierce Inlet, Florida; a-e,g, holotype3(CL 10.1 mm)
USNM 267112; f, paratype 9 (CL 11.6 mm) USNM 267114: a. Anterior carapace, eyestalks, and antennae,
dorsalview;b.Right(major)cheliped,externalsurface;c.Right(major)chelipedinternalsurface;d,Left(minor)
cheliped, external surface; e. Ischium ofright (major) cheliped of5, internal surface; f, Ischial dentition, right
(major)chelipedof2, internalsurface;g. Posteriorabdomen,telson, uropods,dorsalsurface.Scalelinesindicate
2 mm.
proximolaterally with unfused condylar illa (Fig. 3b)with endopodal palp long, nar-
process articulated to distolateral extreme row, terminal article deflected proximally
ofsecondarticle;fourtharticlenarrowerthan at articulation; proximal endite densely se-
third; flagellum sparsely setose and more tose on concave margin, terminally with
than 4 times length ofantennular flagella. dense field of complex setae; distal endite
Mandibles set below the produced, elongate,terminallytruncateandarmedwith
rounded, median lobe of epistome; man- stiff"bristles; exopodite low, rounded. Sec-
dible (Fig. 3a) with large, terminally setose, ond maxilla (Fig. 3c) with endopod nar-
3-segmentedpalp, elongated third article of rowed abruptly at distal end, terminus di-
palp terminally rounded; incisor process rectedmesially, firstandsecondenditeseach
with well-defined teeth on cutting margin, longitudinally subdivided, exopod forming
fieldof3-4 largedistalteeth separatedfrom large, broad, scaphognathite. First maxilli-
largeproximal tooth byline ofsubpectinate ped (Fig. 3d) with proximal endite trian-
lower teeth, internal surface with lip giving gular, marginal setation including stronger,
rise to molar process proximal to incisor curved setae at distal corner; distal endite
teeth; paragnath (not figured)uncalcified, set elongate, ovoid, mesial halfofexternal sur-
against proximal surface ofmolar process, faceandall marginsheavily setose, internal
distolateral comer slightly produced and surfaceconcave; exopodtriangular, divided
opposingteethofmolarprocess. First max- bytransversesuture;distalpartbroaderand
344 PROCEEDINGSOFTHE BIOLOGICALSOCIETY OFWASHINGTON
with longer marginal setation at its mesial First pereopods with major and minor
end, proximal part with field of mesially cheliped strongly developed (Fig. la), near
directedsetaenearmesialend;epipodlarge, equalinsizebutdissimilarinshapeofprop-
broad, weakly subdivided by transverse su- odus and dentition offingers, especially in
ture, its anterior end tapered, angular. Sec- males; majorchelipedlocatedoneitherright
ond maxilliped (Fig. 3e) with long, narrow or left side ofbody. Major cheliped ofma-
endopod; endopodalmerusarcuate, slightly ture male (Fig. 2b, c) massive and strongly
heavierin proximal halfthan in distal, flex- calcified; ischium slender, superior margin
or margin with dense fringe oflong, close- sinuous, inferior (flexor) margin with row
set setae; carpus short; propodus heavy, ofsmall, distinctlyhooked denticles; merus
weakly arcuate, length equal to or less than unarmed, about 1.8timeslongerthanbroad;
2 timeswidth, equaltoorlessthan Vilength carpusbroad, increasinginbreadthdistally,
ofmerus; dactylus short, about V2 length of inferior margin arcuate, superior and infe-
propodus, extensor margin arcuate; exopod rior margins keeled, terminated distally in
about as long as endopodal merus, margin- blunt comers; propodus heavy, length (in-
ally fringed by long setae, subdivided by cluding fixed finger) about 1.7 times height,
weak transverse suture at '/s length; epipod innersurfaceofpalmsmooth,withoutswol-
small, with short, rounded proximal lobe len proximal boss; weak unarmed furrow
and narrow distal lobe. Third maxilliped extending posteriorly fromjust below gape
(Fig. 3f)withoutexopod;endopodwithlong, of fingers on outer face of palm; superior
densesetationonmesialmargin; endopodal and inferior propodal margins keeled, keel
ischium subtriangular, slightly longer than of inferior becoming ill-defined beyond
broad,proximomesiallipformingproduced midlength and absent on fixed finger; fixed
lobeorsubacutecomer,internalsurfacewith finger thick, heavily calcified, prehensile
low medial, longitudinally oriented eleva- margin armed with 2 small well-separated
tion bearing well-defined curved row of triangular teeth in proximal '/s and broad,
about 9-1 1 sharp teeth, usually with 2-3 microserrated tooth just proximal to mid-
smallersupplementaryteethtrailingventral length, with distal halfofmargin unarmed
to proximal end of primary row; merus and terminated at subacute upturned tip;
subquadrate,slightlybroaderthanlong;car- dactyluswithsubacute,hookedtip,external
pus strongly flexed in proximal third, with shoulder of superior margin with setose
setose lobe on flexor margin, internal sur- punctum abutted against low tubercle in
facefaceted, superiorfacetglaborousexcept proximal 'A oflength in addition to line of
formarginalsetae,andinferiorfacetssetose; about 6 setose punctae on internal side of
propodus large, subtriangular, about as superior margin, inferior (prehensile) mar-
broadaslong,proximal%ofinferiormargin gin with low, sinuously margined tooth en-
forminglarge, rounded, densely setoselobe; compassing distal '/2 and separated from
dactylus broad terminally, slightly longer tooth on proximal Vi by roundedgap, prox-
than broad, fringed with very dense field of imal tooth with weakly bicarinate margin
close-set, stiff"setae on broad terminal mar- bearing scant small tubercles or microser-
gin. ration, proximaltoothseparatedfromprox-
Branchial formula includes exopods and imal endofinferiormargin byroundedgap.
epipods as described for first and second Majorcheliped offemale also massive (Fig.
maxillipedsabove;branchiaelimitedtosin- la, b) but less heavily calcified and slightly
gle rudimentary arthrobranch on second different in sculpture than that of typical
maxilliped, pair ofarthrobranchs on third mature males; teeth of dactylus usually of
maxilliped, and pair of arthrobranchs on slightly lowerprofile than in males, those of
each ofthe first through fourth pereopods. fixed finger usually centered more proxi-
VOLUME 107, NUMBER 2 345
Fig. 3. Eucalliax mcilhennyi, holotype 3 (CL 10.1 mm), from Fort Pierce Inlet, norida, USNM 267112,
right appendages; a-e, external surface; f, internal surface: a, Mandible, excluding paragnath; b. First maxilla;
c. Secondmaxilla, setaenotshown;d, Firstmaxilliped, setaenotshown;e,Secondmaxilliped,setaenotshown;
f, Third maxilliped. Scale lines indicate 1 mm.
mally than in males, both fingers relatively spinules; merusunarmed; carpuswithblunt
lessmassive, morenarrow, sometimes more distal comers; propodus with distinct un-
acutelytipped, thanin males; propodus not armed furrow extending posteriorly from
as longrelative to height, and with margins just below gape offingers on outer surface,
more arched, than in males. fixed finger tapered to very narrow acute or
Minor cheliped (Fig. 2d) slightly lighter, subacute tip, prehensile margin proximally
lessarmedthanmajor, inferior(flexor)mar- serrate; propodus less elongate, relative to
gin ofischium with line ofdistinct hooked height, in females (Fig. la) and juvenile
346 PROCEEDINGSOFTHEBIOLOGICALSOCIETY OFWASHINGTON
males than in mature males; dactylus nar- ferodistalcomerofpropodusroundedwith-
row, with subacute tip, unarmed on pre- out evidence offixed finger; dense setation
hensile margin. on outersurface ofbothpropodusandtear-
Second pereopod (Fig. 4a) chelate, most shaped dactylus divided into upper and
offlexormarginsofischiumandmeruslined lower fields, setae slightly stronger in lower
with evenly spaced long setae, similar setae fields ofboth, densest ondactylus, especial-
patchy and restricted primarily to distal ly onandnearinferiormargin; internal sur-
patches on flexor margin in carpus, inferior face of propodus distally with single large
margin of propodus with similar setal very long seta originating from near supe-
patches which are long proximally, pro- rior margin and reaching distally well be-
gressively more reduced in length and stiff"- yondtipofdactyl; dactylterminatedinnar-
eneddistally, subterminallybecomingdense row corneous tip hooked toward external
patch ofshort, stiff"bristles; prehensile mar- side. Fifth pereopod (Figs, la, 4d) minutely
ginsofbothfingerscorneous, finelyanduni- chelate,opposablesurfacesofpropodusand
formlymicroserrate alongstraightedge over minute dactylus excavate, spooned, termi-
most oflength, microserration terminating nally rounded, forming beak-like chela ob-
proximallyat small corneous toothandter- scured by dense fields ofsetation on distal
minatingdistallyinthickenedcorneoustips Vi ofpropodus and superior surface ofdac-
of fingers; superior margin of dactylus tylus; corneous prehensile lip ofpropodus
slightlysinuous,withpatchesofstiff",arched finely divided into arched row ofclose-set
bristles becoming increasingly reduced in denticles.
length, close-set and more arched distally. Texture ofabdominal somites (Figs, la,
Thirdpereopod(Fig. 4b) meruslengthabout 5a, b) smooth dorsally, glabrous, typically
2 times width, ffexor margin weakly sinu- with setae limitedto isolatedpairs ofsetose
ous, typically with 2 small prominences punctae on first tergite, strongest ofwhich
bearing tufts ofsetae; carpus broadly flared areinposteriorhalf;secondtergitewithpos-
distallytoproducestronginferiorlobe,width terolateral crescentic line of small, lightly
at this point about % length, inferior lobe setose granules, anterior to which is short
terminally with field of long arched setae, obliqueline and posteriorofwhich are sev-
diminishing in length toward articulation eral small fields of similar granules and
with propodus; propodus with strong prox- punctae, posterolateral-mostofwhichbears
imallydirectedlobeoninferiormargin,lobe long setae; third to fifth tergites each with a
terminally with field of long arched setae distinct, lateral, transverse field oflong soft
diminished distally along margin to close- setae, posteriortoeach ofwhichliesa small
set shorterbristlesthatbecome slightlylon- fieldoflongstiff"setae on the lateral margin;
ger at distal extreme, superior margin with sixth tergite (Figs, la, 2g) with lateral, lon-
tufts oflongarched setae, patterned tufts of gitudinal finely setose lines of small gran-
lightersetaeonouterfaceofarticle;dactylus ules, primary line turning to transverse and
tear-shaped, length about 1.4 times width, directedtowardmidlinein posteriorhalfon
terminating in narrow corneous tip hooked lateral lobeoftergite, posteriorlywith strong
toward external side, inferior margin sinu- tuft oflong stiff"setae at each posterolateral
ous, outer (external) face crossed by fields comer, similar tuft on posterior margin
ofshort, slightlyhooked setae inwhich lon- overlying each anterolateral comer of tel-
gest setae are near superior margin, with son. Shape of first abdominal tergite nar-
separate,densefieldofslightlyheaviershort rowedanteriorly, anterior 'A off"setbylateral
weakly hooked setae along lower extreme notch and subquadrate (most striking in
ofexternal face andinferiormargin. Fourth mature males); second tergite elongate, at
pereopod (Figs, la, 4c) not subchelate, in- least 1.6 times median length ofthird; third
VOLUME 107, NUMBER 2 347
a,b,c,d
Fig. 4. Eucalliax mcilhennyi, new species, from Fort Pierce Inlet, Rorida; a-c, holotype 3 (CL 10.1 mm)
USNM 267112; d-e, paratypeV (CL 11.6 mm), USNM 267114: a. Rightsecondpereopod, externalsurface; b,
Right third pereopod, external surface; c. Right fourth pereopod, external surface; d. Right fifth pereopod,
posteromesial surface; e. Enlargedterminus offifth pereopod. Scale lines indicate 2 mm.
tergitewithdeep, elongateanterolateral sul- extended plate ofthickened, leathery integ-
cusextendingacrossanterior V3ofeach side. umentcontinuouswithmassivecontinuous
Anterior Vi of first abdominal somite covering ofleathery integument that forms
wrapped ventrally by girdle of thickened, articular membrane between first and sec-
leathery integument, girdle rounded later- ond abdominal somites and that covers en-
allyandtransverselybisectedbyafurrowed tireventral surface ofsecondabdominal so-
suture,posteriorhalfofsomiteventrallywith mite; similar leathery integument largely
pairofconspicuous ovoid plates comprised covering ventral surfaces ofremaining ab-
of similar thickened integument, each of dominal somites.
which (in males and females) articulates to First pleopod ofmale and female unira-
firstpleopodatitsposteriorextreme;medial mous, composed of2 articles; in male (Fig.
posterior margin offirst abdominal somite 6a, b), total length about % that of second
marked a triangular or rounded, anteriorly pleopod, distal article about equal in length
348 PROCEEDINGSOFTHE BIOLOGICALSOCIETY OFWASHINGTON
a,b,c,d
Fig. 5. Eucalliaxmcilhennyi, newspecies, holotype$(CL 10.1 mm)fromFortPierceInlet, Florida,USNM
267112:a,Firstandsecondabdominalsegments,ventralsurface,setaenotshown;b.Firstandsecondabdominal
segments, right lateral surface, setae not shown. Eucalliaxjonesi(Heard 1989) from Bimini Harbor, Bahamas;
c, d, paratype 3 (CL 9.6 mm) GCRL 1136; e, holotype 3 (CL 9.8 mm) USNM 221861: c. First and second
abdominal segments, ventral surface, setae not shown; d. First and second abdominal segments, right lateral
surface, setae not shown; e, Left(major) chela, internal surface, setae not shown. Scale lines indicate 5 mm.
toproximalandbifurcateatabout%length, article, terminal article with longest setae
with acute tip ofspooned terminal end di- on broad shoulder just beyond midlength.
rected laterally; in female (Fig. 6c) total Second pleopod of male and female bira-
length subequal to that ofsecond pleopod, mous, with appendix interna on endopod;
proximal article about % length ofterminal in male (Fig. 6d), dense setation largely re-
VOLUME NUMBER
107, 2 349
stricted to distal extreme ofexopod, distal segments, and uropods; when present, pat-
lobe of endopod and appendix masculina, tern usually strongest on posteriormost ab-
appendixmasculinamarkedlyoverreaching dominal segments and telson; carapace
distal lobe ofendopod and with small ap- sometimeswithsmallmediansquareofred-
pendix interna at its base; in female (Fig. dish pigment just posterior to cervical
3e), both rami with long setae, appendix groove. Chelipeds usually opaque white;
internasmallandconstricteddistally. Third sometimes with slight evidence ofpale yel-
to fifth pleopod pairs (Figs. 1a, 6f) forming lowatarticulationsofchelipedsandonuro-
large, posteriorly cupped fans when cross- pods.
linked by hooked setae ofappendices inter- Known rangeandhabitat.—Known from
nae on opposed margins of endopods; intertidalburrowsintheimmediatevicinity
endopod ofeach subtriangular, appendices ofthe type locality on the Atlantic coast of
intemae finger-like, movably articulated to Florida, U.S.A. Thetypelocalityisatidally
mesial margin ofendopod. Telson (Fig. 2g) exposedsandflatsparselyvegetatedwithsea
broaderthan long, subrectangular, broadest grass, located on the south margin ofFort
at lateral lobes in posterior half, posterior PierceInlet, Florida. A single specimen was
margin weakly bilobate; dorsal surface with taken from a second site afewhundred me-
medial tuft of large setae separating two ters distant, on the lower intertidal reaches
halves of strong, transverse carina; lateral ofawell-packedsandbeachonCoonIsland,
margins sinuous, without setae; posterior whichformsanorthernmarginonthissame
marginwithtuftofsetaeoneachoftheweak inlet. All ofthese fossorial specimens were
lateral lobes. Uropod (Fig. 2g) with heavy, extracted from their burrows with yabby
blunt, posterolaterally directed tooth on pumps. Theburrowofatleastonespecimen
protopod, toothover-reachinganterolateral appeared to also harbora small commensal
margin ofendopod; endopodbroad, subov- crab ofthe genus Pinnixa.
al, slightly longerthan broad, dorsal surface Etymology.—This species is named for
with tuft oflong setae on posterior 'Z?, setae Mr. John S. McllhennyofAvery Islandand
ofposteriormarginlongestposterolaterally; Baton Rouge, Louisiana. True to tradition
exopod with anterodorsal plate falling well in his family, Mr. Mcllhenny has melded
short ofdistal endopod margin, distal edge his passion forTabasco® peppersaucewith
of plate lined with short, thick spiniform an equal enthusiasm for nature and studies
setae grading to thinner longer setae ofex- innaturalhistory. The financial supportthat
opod margin and long stiff, spiniform setae he has contributed to a number ofresearch
at posterodistal comer ofplate, distal mar- biologists through his Coypu Foundation,
gin ofexopod with dense fringe ofsetation has furthered research in many subdisci-
grading to large spiniform setae ofpostero- plines, including crustacean biology.
distal margin. Remarks.—Of\ht four species ofthe ge-
5/ze.—Among the materials examined, nus, Eucalliax mcilhennyi, new species, E.
the largest male is the holotype (CL 10.1 jonesi(Heard 1989) from the Bahamas, and
mm) and the largest female is an ovigerous E. cearaensis Rodrigues & Manning, 1992
paratype (CL 1 1.6 mm). Egg size (max. di- from Brazil, all lack the acutely projecting
ameter) on this ovigerous specimen ranged armaturethatcharacterizesdistalcomersof
from 0.76-0.96 mm, prior to preservation. thecarpusinthechelipeds of£". quadracuta
Color(from notes and colorphotographs (Biffar 1970) from Venezuela. While each
oflive specimens).—Overallwhitish opaque of these comers has typically developed a
to very faint rosy pink; may lack color pat- doublet ofspines inE. quadracuta, they are
tern or sometimes have very faint dorsal instead weakly produced to a single sub-
patterning ofpink on carapace, abdominal acute or rounded comer in the other afore-