Neocallichirus-Cacahuate, A New Species Of Ghost Shrimp From The Atlantic Coast Of Florida, With Reexamination Of Neocallichirus-Grandimana And Neocallichirus-Lemaitrei (Crustacea, Decapoda, Callianassidae)

14 Pages·1995·8.9 MB·

by  D L Felder

PROCEEDINGSOFTHE BIOLOGICALSOCIETY OFWASHINGTON
108(3):477-490. 1995.
Neocallichirus cacahuate, a new species of ghost shrimp
from the Atlantic coast of Florida, with reexamination of
A^. grandimana and A^. lemaitrei
(Crustacea: Decapoda: Callianassidae)
Darryl L. Felder and Raymond B. Manning
Department ofBiology, University ofSouthwestern Louisiana,
Lafayette, Louisiana 70504, U.S.A.;
Department ofInvertebrate Zoology, National Museum ofNatural History,
Smithsonian Institution, Washington, D.C. 20560, U.S.A.
yitorac/.—Diversity ofinfaunal crustaceans remainspoorly known, even for
macrofaunal forms from accessible shorelines that have been urbanized for
decades and studied extensively. Neocallichirus cacahuate, new species, is de-
scribed from sparsely vegetated intertidal flats ofPeanut Islandjust inside Lake
Worth Inlet on the Atlantic coast ofFlorida, where it occurs as a minor con-
stituent of a thalassinid fauna dominated by the callianassids Neocallichirus
rathbunae(Schmitt), Sergio mericeaeManning& Felder, and Callichirus major
(Say).Thisnewspecies,atfirstconfusedwithNeocallichirusgrandimana(Gibbes)
which also occurs occasionly in this habitat, bears ageneral resemblance to the
youngofthatlargercongenerincarapacial features,chelae, telson, anduropods.
However, in addition to the much largerbody size attained by A^. grandimana,
this species and N. cacahuate can be distinguished on the basis ofdifferences
in bodycoloration, eyes, proportionsofcheliped articles, shape ofthe uropodal
endopods, and sculpture of the first and second male pleopods. At present
known from only four small specimens, all from the type locality, N. cacahuate
appears to mature at a much smaller size than does N. grandimana.
In the early 1980's, we initiated studies deeply burrowed thalassinid ghost shrimp,
to document exhaustively the coastal deca- In the course of our subsequent studies of
podcrustaceandiversityintheIndian River these large series ofmaterials collected, we
Lagoonandadjacentembaymentsofsouth- have come to recognize the divergent mor-
eastern Florida, a task in which we remain phology which characterizes genera of the
engaged. We chose to focus initially on in- western Atlantic Callianassidae, the subtle
tertidaland shallowsubtidal infaunalgroups charactersthatoftenseparatecloselyrelated
becausethehabitatswerereadilyaccessible, western Atlantic species, and the remark-
these groups were not well represented in able diversity ofthis taxocene in southern
local collections, and both the assemblage Florida (Manning & Felder 1986, 1991,
and the habitats appeared vulnerable to 1992, 1995, Manning & Heard 1986, Man-
continuing shoreline development in this ning 1987, 1993, Rodrigucs & Manning
rapidly urbanizing region. Our experience 1992, Felder & Rodrigues 1993, Felder &
in sampling with yabby pumps (see Man- Manning 1994, Manning& Lemaitre 1994).
ning & Felder 1995, and citations therein) We herewith report yet another previ-
facilitated our obtaining large samples of ously unrecognizedthalassinid species from
macroinfaunal forms,especiallyofthe more this region, the third new thalassinid and
478 PROCEEDINGSOFTHEBIOLOGICALSOCIETY OFWASHINGTON
fifth new infaunal decapod that we have re- on loan from the Yale University Peabody
ported from this southeastern region of Museum ofNatural History. From our ex-
Florida. This new species, at first confused amination, the latter specimen was con-
with juveniles of a sympatric congener, firmed as a junior synonym of A^. grandi-
Neocallichirusgrandimana (Gibbes, 1850), mana (see Manning 1987). The types ofA^.
represents the fifth species of that genus cacahuatewere compared with fresh, com-
(sensuManning& Lemaitre 1994) tobede- parably sized topotypic material of A^. le-
scribed from the western Atlantic. As with maitreiManning, 1993 obtainedrecentlyin
several other new callianassids we have theIslasdelRosario,ColombiabyDLFand
found, the atypical coloration offresh spec- R. Lemaitre (USLZ 3556). Publication fig-
imens first suggested that they may repre- ures were prepared by DLF.
sent a unique form. In order to definitively
distinguish the new species, our present
analyses includes detailed comparisons with Family Callianassidae Dana, 1852
juvenilesandadultsofTV. grandimanafrom Subfamily Callichirinae
southern Florida, a markedly larger species Manning & Felder, 1991
at maturity. Neocallichirus Sakai, 1988
Material examined is listed by location Neocallichirus cacahuate, new species
followedbydate, collector, numberofspec- Figs, la-c, 2, 3a-e, 4a-c, 5
imens per sex and condition (mutl = mu-
tilated, ov = ovigerous, immat = imma- Type material.—Holotype: North side of
ture), and museum number. Size is ex- Peanut Island, sparsely vegetated sandy to
pressed as postorbital carapace length (cl) shellysandintertidalflats,LakeWorth,West
or postorbital total length (tl) measured in Palm Beach County, Florida, 26°46.7'N,
millimeters (mm). The holotype and two 80°2.9'W, 23 Jul 1994, coll: D. L. Felder,
paratypes oiNeocallichirus cacahuate have J. M. Felder, R. D. Felder and W. D. Lee,
been deposited in the National Museum of 1 6 (cl 13.2 mm; photographic voucher)
USNM
Natural History, Smithsonian Institution, 268770.
Washington, D.C. (USNM). Aparatype has Paratypes: Same site as holotype, 4 Mar
been deposited in the University ofSouth- 1987 (RBM station 87-5), coll: R. B. Man-
western Louisiana Zoological Collections, ning and W. D. Lee, 2 S (cl 9.9 mm) USLZ
Lafayette, Louisiana (USLZ). As the single 3552, (cl 10.5 mm) USNM 268861, 1 2 (cl
small female specimen ofA^. cacahuate ap- 7.2 mm) USNM 268769.
peared to be immature, the description was Diagnosis.—Front of carapace with 3
based primarily upon the larger male spec- small angular anterior projections, medial
imens. Comparative studies of A^. grandi- usuallymoreacuteandanteriorlyadvanced
mana are based upon males ofthat species than laterals. Eyestalks broad, with large
from the Atlantic coast ofFlorida, some of swollen cornea occupying more than halfof
which were immature stages (USLZ 3554) stalk width. Third maxilliped with arched
andofcarapacelengthsapproximatingthose dactyl and broad propodus, height ofprop-
ofA", cacahuate, othersofwhichwere much odus greater than length of dactyl; maxi-
larger and fully mature (USLZ 3553). Neo- mum diagonal length of merus-ischium
callichirus cacahuate was also compared morethantwicewidthatjointbetweenthese
with two topotypic juvenile females of A^. articles. Major cheliped with inferior mar-
grandimanafromKeyWest,Florida(USLZ ginofmeruslackingdistinctspine, regularly
3555) and to the male holotype specimen rounded in outline and armed with line of
ofGlypturus siguanensis Boone, 1927 from small slightly hooked or distally-directed
Isle of Pines, Cuba (YPM 8160), obtained denticles; carpus greater than or equal to %
VOLUME NUMBER
108, 3 479
length ofpalm, inferior marginsofboth un- exposed eyestalk in dorsal view slightly ex-
armed; dactylus with bilobed subrectangu- ceeding basal width, lobate to obtusely an-
lartoothinproximalhalf, separatedbydeep gulartips reachingto ornearly to distal end
cleft from broad subtriangular tooth distal- ofbasal antennal article; mesial surfaces of
ly, terminally with acute hooked tip. Minor eyestalks closely appressed over proximal
cheliped with fingers subequal to or slightly portion of midline, slightly divergent ter-
longer than palm, palm subequal to or minally; base of eyestalk with mesial sen-
slightly longer than carpus. Uropodal en- sory punctae on either side ofrostrum.
dopod broadly subrectangular, posterior Antennular peduncle shorterand heavier
margin truncate, nearly straight; uropodal than antennal peduncle, terminal article
exopodwithsuperiorplatenotreachingdis- about 1.5 times length ofpenultimate and
tal margin ofinferior plate. Telson broader not exceeding midlength ofterminal article
than long, posterior margin truncate to ofantennal peduncle; penultimate and ter-
weakly sinuous. minal articles of peduncle with ventrome-
Description.-SizQ small, males maturing sial and ventrolateral rows of long setae,
mm
at relatively small size; cl <15 and tl those of ventrolateral row longer; rows of
mm
<65 in known specimens. setae continued onto ventral ramus of fla-
Frontal margin ofcarapace (Figs, la, 5a) gellum, proximalarticlesofwhich alsobear
with3anteriorprominences,lateralofwhich very long midventral setae; rami of flagel-
are usually lobiform or obtusely angular, lum subequal in length or with ventral
overlying inner margins ofantennal pedun- slightly exceeding dorsal, 5-6 times length
cles; median prominence advanced slightly ofterminalarticleofpeduncle;dorsalramus
beyond laterals, forming short rostrum, not with sparse setae in proximal half, distal
extending to cornea. Rostrum usually ter- halfwith dense tufts ofshort ventrolateral
minating in acute or slightly spiniform pro- setae, articles comprising tapered tip with
jection, lateral prominences sometimes ter- dense line ofventral aesthetascs. Antennal
minating similarly in smaller specimens. peduncle with terminal article subequal to
Carapace lacking rostral carina, with dis- or slightly longer than penultimate article;
tinct linea thalassinica, and with defined short basal article forming slightly pro-
dorsal oval marked posteriorly by deep duced, setose lip above laterally produced
transverse cardiac furrow, latter extending excretory pore; secondarticle with deep, di-
anteroventrally to either side above linea agonal ventral suture, distolaterally with
thalassinica as shallow groove demarcating single tuft of setae, small, distinct, dorsal
posteriorhalfofdorsal oval. Frontal margin scale articulated at joint with third article;
of carapace continued ventrolaterally be- third article elongate, much narrower than
yond intersection with linea thalassinicaand second, distinctly longer than combined
onto branchiostegite as thickened oblique lengths of first two, proximolaterally with
ridge terminating at anterior end ofprom- partially fused condylar process articulated
inentrounded hepaticbossand lower, more to distolateral extreme of second article;
elongate swelling. Subantennular region of fourth article slightly narrower than third;
epistomeformingcalcifiedsocketforanten- antennal flagellum about 2.5 times length
nal peduncle, bearing dense tuft oflong se- ofantennular flagellum.
tae below peduncle. Mandibles (Fig. 2a) with large,
Eyestalks subtriangular, with large, bul- 3-segmented palp, elongated third article of
bous, hemispherical, darkly pigmented cor- palp slightly tapered and terminally round-
neas; swollen cornea occupying more than ed, concave on external surface, long setae
halfofstalkwidth and markedly distending distally on second article and on proximal
anterolateral margin ofeyestalk. Length of extensor surface of third, field of short.
480 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
b,e a,d c,f
Fig. 1. Neocallichiruscacahuate, newspecies, maleholotype(cl 13.2 mm)from PeanutIsland,LakeWorth,
Florida,USNM268770:a.Carapacefront,eyestalks,andbasalantennalsegments,dorsalview;b,Majorcheliped,
internal surface; c, First pleopod, posterolateral surface. Neocallichirusgrandimana (Gibbes), immature male
(cl 13.2 mm) fromjust north ofSt. Lucie Inlet, Florida, USLZ 3554: d, Carapace front, eyestalks, and basal
antennalsegments,dorsalview;e.Majorcheliped,internalsurface;f,Firstpleopod,posterolateralsurface.Scale
lines indicate 5 mm.
weakly hooked setae on most of extensor and narrowed to terminal tip; proximal en-
surface of third article, setae heavier and dite with very dense fine setation on most
lesshooked terminally; incisorprocesswith oflower mesial margin, terminal lobe with
well defined, terminally corneous teeth on fieldoflarge, terminallybifurcate setae; dis-
cutting margin, teeth largest on proximal % tal endite elongate, proximally narrow,
ofcutting margin, internal surface with lip broadening terminally where armed with
giving rise to molarprocess proximal to in- short stiff'bristles, distalmost bristles may
cisor teeth, molar process with about 6-7 beweaklybifurcate;exopoditelow,truncate
small marginal teeth, 1 of which may be and setose. Second maxilla (Fig. 2d) with
spaced proximally on internal margin apart endopod acute distally, first and second en-
from others; paragnath (Fig. 2b) rounded, dites each longitudinally subdivided and
scaliform, poorly sclerotized, setagainstand densely setose terminally; first endite with
below molar process. First maxilla (Fig. 2c) lowarcuate setose crest across external sur-
withendopodalpalp long, narrow, terminal face oflower lobe, internal surface fused to
article deflected proximally at articulation broad, rounded,platebearinglongmarginal
VOLUME 108, NUMBER 3 481
setae; exopod forming large, broad, sca- epipods as described for first and second
phognathite. First maxilliped (Fig. 2e) with maxillipedsabove; branchiaelimitedtosin-
proximal endite narrowly produced, den- gle rudimentary arthrobranch on second
tiform, marginally setose; distal endite ro- maxilliped, pair ofarthrobranchs on third
bust, subquadrate, mesial half of external maxilliped, and pair of arthrobranchs on
surface and margins heavily setose, long each offirst through fourth pereopods.
dense setae of outer surface overreaching First pereopods forming dissimilar che-
and obscuring stout bifurcate bristles on lipeds, major cheliped heavy, massive in
mesial margin, longest setae terminal, in- adults (Fig. lb), similar to minor cheliped
ternal surface concave; exopod ovoid, di- in juveniles. Major cheliped of adults
vided by transverse suture marking notch strongly calcified; ischium slender, superior
on mesial margin, longest setae in field on margin sinuous, inferior(flexor) margin with
external surface and mesial margin proxi- few widely spaced minute denticles; merus
mal to notch; epipod large, posterior lobe about 1.5 times as long as high, superior
broad, anterior end tapered to narrow ter- margin arcuate, inferior margin lackingdis-
minus. Secondmaxilliped(Fig. 2f)withlong, tinct enlarged spine, regularly rounded in
narrow endopod; endopodal merus length outlineandarmedwith lineofsmall slightly
about 4 times width, flexor margin with hookedordistallydirecteddenticles; carpus
dense fringe oflong, close-set setae; carpus almostaslongashigh,relativelyshorterand
short; propodus slightly arcuate, heaviest higher in adults than in immature speci-
distally, greatest width about % length; dac- mens, in largeradults length about % height
tylus more than '/g length ofpropodus, with and greater than or equal to V^, length of
terminal brush ofstiff'bristles; exopod nar- palm, superior margin weakly arcuate,
row, arcuate, distally overreaching end of forming keel terminated at distal acute cor-
endopodalmerus, marginallyfringedbylong ner ofarticle, proximoinferior margin reg-
setae; epipod small, partial suture subdivid- ularly rounded and smooth in outline, low
ing angular terminal lobe; arthrobranch ru- submarginal denticles on internal surface;
dimentary. Third maxilliped (Fig. 2g) with- propodus heavy, length (including fixed fin-
out exopod; endopod with long setation on ger)inadultsdistinctlylessthantwiceheight,
mesial margin, terminal 3 articles also with latter greatest proximally, superior margin
longsetation on extensor margins; length of ofpalmformingunserratedkeelinproximal
endopodalmerus-ischium exceeding2 times half, proximal inferior margin with poorly
width; ischium subrectangular, distinctly defined smooth keel extending to base of
longer than broad, proximomesial margin fixed finger, keel lined on internal side by
rounded, not strongly produced, internal lineofsubmarginaldenticlesextendingonto
surfacewithwelldefined,longitudinallyori- base of fixed finger; angular, tuberculate
entedelevation bearingcurved rowofsharp prominence at base ofgape, below which is
denticles; merus subtriangular, slightly rounded excavation in basal, opposable
broader than long; carpus heavy and sub- margin offixed finger; fixed finger in adults
triangular, with setose lobe on flexor mar- with prehensile margin ranging from nearly
gin, internal surface with dense field offine smooth, with low broad teeth, to serrate;
setae distally; propodus large, subquadrate, dactylus (movable finger) subequal to or
height subequal to or exceeding length, in- shorter than palm, opposable margin with
ternalsurfacewith median fieldoffine,dense bilobed subrectangular tooth in proximal
setae; dactylus narrow, slightly arcuate, half, separated by deep cleft fiom broad
shorter than height ofpropodus, terminally subtriangulartooth distally, terminally with
with small brush ofstiff'bristles. acute hooked tip.
Branchial formula includingexopodsand Minor cheliped (Figs. 3a, 5b) well calci-
482 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig. 2. Neocallichiruscacahuate, newspecies, maleholotype(cl 13.2 mm)from PeanutIsland, LakeWorth,
Florida, USNM 268770, rightmouthparts:a. Mandible,externalsurface;b,Paragnath,externalsurface;c, First
maxilla, external surface; d. Second maxilla, external surface; e, First maxilliped, external surface; F, second
maxilliped, external surface; g. Third maxilliped, internal surface. Scale lines indicate 2 mm.
fied but terminally more slender, less mas- subrectangular, forming most massive ar-
sive than major; ischium narrow, unarmed ticle of limb, slightly longer than merus,
or with at most a few minute denticles on length slightly exceeding height and mark-
inferior margin, subequal in length to me- edlyexceeding length ofpalm, heightgreat-
rus; meruselongatelyovoid,lengthlessthan est at orjust proximal to midlength; chela
twice height, inferior margin usually with narrower than and exceeding length ofcar-
someminutedenticlesdistally;carpuslarge, pus; palm subrectangular, length subequal
VOLUME 108, NUMBER 3 483
a,f b,c,d,e
Fig. 3. Neocallichiruscacahuate, newspecies, maleholotype(cl 13.2 mm) from Peanut Island, LakeWorth,
Florida,USNM268770:a. Minorcheliped, internalsurface;b. Rightsecondpereopod,externalsurface;c, Right
third pereopod, external surface; d. Right fourth pereopod, external surface; e. Right fifth pereopod, external
surface. Neocallichirusgrandimana (Gibbes), immature male (cl 13.2 mm) fromjust north ofSt. Lucie Inlet,
Florida, USLZ 3554: f. Minorcheliped, internal surface. Scale lines indicate 5 mm.
to height, latter distinctly less than (usually ened distally, subterminally becomingdense
<%) that ofcarpus; fixed finger subequal in patch ofshort, stiff'bristles; prehensile mar-
length to palm, opposable margin typically gins ofboth fingers corneous, graded from
with 3-5 acute teeth proximally, beyond finely micropectinate proximally to smooth
which margin grading from weakly serrate distallyin both, thatoffixed fingerobscured
to smooth; gape slightly setose, armed by by conspicuous tuft of arched bristles on
small denticle on internal side; dactylus external side near midlength, margins ter-
(movable finger) in adults consistently ex- minated distally in thickened corneous tips
ceeding length of palm, opposable margin offingers; superior margin ofdactylus near-
usuallywith low, broad toothandweak ser- ly straight, with long marginal setation
ration in proximal half proximally, dense patch ofshort stiff'setae
Second pereopod (Fig. 3b) chelate, long and bristles distally; external surface ofcar-
setaesparselydistributedon inferiormargin pus, propodus and dactylus with scattered
of ischium, more closely set over most of patches ofshort setae.
flexor margin on merus and both margins Third pereopod (Fig. 3c) merus broadest
ofcarpus,thoseofsuperiormarginofcarpus indistal half, length lessthan 3 limesheight;
set in a series of tufts, inferior margin of carpus broadest distally, length <2 times
propodus with similar long setae proximal- height, terminally with patchesoflongsetae
ly, progressively reduced in length and stiff^- overreaching propodus; propodus with
484 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
proximally-directed lobe ofinferior margin mous, composed of2 articles; in male (Fig.
not reaching beyond broadest part of car- Ic), distal article spatulate, shorter than
pus, lobe terminally with long distally-di- proximal, subdivided into 2 lobes by weak
rected setae, inferodistal margin with spaced longitudinal furrow, anterior lobe termi-
tufts ofslightly shorter setae, superior mar- nally rounded in mature specimens, poste-
gin with fieldsoflongsetaegradingto small rior lobe terminally acute with tip directed
patterned tufts of lighter, shorter setae on anteriorly; in female (immature. Fig. 5c)
outer face of article; dactylus tear-shaped, both articles narrow and elongate, terminal
densely setose on external surface, termi- article with weakly produced shoulderjust
nating in corneous tip hooked toward ex- beyond midlength. Second pleopod ofmale
ternal side. andfemalebiramous;inmale(Fig. 4a), long
Fourth pereopod (Fig. 3d) with merus setation largely restricted to tufts on lateral
heavier, longer than carpus; subchelate, in- margin and terminus of exopod, lateral
ferodistalcomerofpropodusproducedinto margin ofendopod and terminus ofappen-
short fixed finger bearing heavy microser- dix masculina; distal lobe of endopod al-
rate setae on external sideand short bristles most as long as appendix masculina, de-
at tip; soft dense setation on outer surface marcatedfromremainderofarticlebyweak
ofpropodus and dactylus, that ofpropodus transverse suture; vestige ofappendix mas-
divided into upperand lowerfields, densest culina markedby small patch ofmicrosetae
in lower field where continued onto lower on mesial margin; in female (Fig. 5d), both
halfofinternal surface; dactylus terminat- rami with long setae, appendix interna nar-
ing in narrow tip hooked toward external row and elongate. Third to fifth pleopods
side. (Fig. 4b) forming large, posteriorly cupped
Fifthpereopod(Fig. 3e)minutelychelate, fans when coupled at mesial margins ofen-
opposable surfaces ofpropodus and minute dopods; endopod of each subtriangular,
dactylus excavate, spooned, terminally short, stubby appendix interna tightly em-
rounded, forming beak-like chela obscured bedded into mesial margin ofendopod.
by dense fields of setation on distal Vi of Telson (Fig. 4c) broader than long, width
propodus and superior surface ofdactylus; less than 1.5 times length, subhexagonal,
corneous prehensile lip on fixed finger of broadest at lateral lobes in anterior half,
chela pectinate. posteriorlytruncatetoweakly sinuous, pos-
Abdominal somites smooth, glabrous terolaterally comers broadly rounded, each
dorsally, with few paired punctae bearing bearingtuft oflong setae; dorsal surface an-
short setae; second tergite posterolaterally teromediallyelevated, withshallowsulcion
with sulcus posterior to which is vertical, lateral lobes to either side and short trans-
crescentic row ofsetose punctae on low ca- verselineofsetaetoposterior. Uropodwith
rina, extreme of posterolateral lobe with angular, posterolaterally-directed lobe of
small tuft oflong setae; third through fifth protopod slightly overreaching anterior
tergites each with small midlateral depres- margin of endopod; endopod broad, sub-
sion bearing short setae, and broadly tri- rectangular, slightlybroaderthan long, pos-
angular depression bearing long soft dense terior margin truncate, nearly straight, dor-
setae on the lateral lobe, position ofthese salsurfacewithlongitudinalcarinaandsmall
depressions more anterior in the more pos- tuft oflongsetae nearposterolateralcomer;
teriormosttergites;sixthtergitewithpattern exopod with anterodorsal plate falling well
of small setose punctae and fine marginal short ofdistal endopod margin, distal edge
setation laterally and distinct transverse, of plate lined with short, thick spiniform
posteriorly-facing groove above telson. setae grading to thinner longer setae ofex-
First pleopod ofmale and female unira- opod margin; dorsal surface ofexopod be-
VOLUME 108, NUMBER 3 485
Fig. 4. Neocallichiruscacahuate, newspecies, male holotype(cl 13.2 mm) from Peanut Island, LakeWorth,
USNM
Florida, 268770: a. Right second pleopod, posteriorsurface; b. Right third pleopod, anteriorsurface; c,
Telson, uropods, and part ofsixth abdominal segment, dorsal surface. Neocallichirus grandimana (Gibbes),
maturemale(cl27.1 mm)fromBearCut,BiscayneBay,Florida,USLZ3553:d.Rightfirstpleopod,posterolateral
surface;f,Rightsecondpleopodalendopod,terminusonly,posteriorsurface.Neocallichirusgrandimana(Gibbes),
immature male (cl 13.2 mm) fromjust north ofSt. Lucie Inlet, Florida, USLZ 3554: e. Right second pleopod,
posterior surface; g, Left third pleopod, distal endopod and appendix interna, posterior surface; h, Telson,
uropods, and part ofsixth abdominal segment, dorsal surface. Scale lines indicate 5 mm.
low plate concave, distal margin with dense three appear to be malurc males ranging
mm
fringe of setation, fringe diminished and (after preservation) from cl 9.9 to 13.2
supplemented by row ofshoil spiniform se- mm and tl from 39.4 mm to 51 mm. The
mm
tae on posterior margin. single female specimen, cl 7.2 and tl
Size.—0\^ the four known specimens. 29.8 mm, isapparently immature,giventhe
486 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
a
Fig. 5. Neocallichirus cacahuate, new species, paratype immature female (cl 7.2 mm) from Peanut Island,
Lake Worth, Florida, USNM 268769: a, Carapace front, eyestalks, and basal antennal segments, dorsal view,
setae not shown; b. Minor cheliped, external surface; c. First pleopod, posterolateral surface; d, Right second
pleopod, posteriorsurface. Scale lines indicate 1 mm.
limited development of setation in its an- cles. The reddish coloration is usually dis-
terior pleopods. tinct from the pinkish-red to rose-violet
Co/or.—Reddish orange, fading quickly typical ofTV. grandimana.
toopaquewhiteinalcohol. Inhfemostadult Known range andhabitat.—Known only
specimens with striking scariet red to red- from intertidal to shallow subtidal habitats
dish orange highlights on lighter faded or- on the northern shores ofPeanut Island in
ange to cream or translucent white ground Lake Worth, a small marine embayment
color; usually with most vivid scarlet oror- immediatelyinsideLakeWorthInletonthe
ange-red patterns on the superior surfaces heavily urbanized lower Atlantic coast of
ofthe chelae, eyestalks, dorsal oval ofcar- Florida, USA. All ofthe four known spec-
apace, tergites ofabdominal segments 2-6, imens ofthis species were takenwith yabby
and as a very broad, poorly defined band pumpsatlowtideinsparselyvegetatedsand
across telson and uropods; color somewhat to shelly sand substrates. Neocallichirus ca-
less orvariably developed on antennae and cahuaterepresentedaverysmallpercentage
cardiac region. Light cream to white on in- ofthe thalassinids taken from this habitat.
feriorsurfacesofchelipedsandimmediately Both large and small specimens ofNeocal-
bordering articulations of pereopodal arti- lichirusrathbunae(Schmitt, 1935)werepar-