PROCEEDINGSOFTHE BIOLOGICALSOCIETYOFWASHINGTON 108(2):266-280. 1995. Description of the ghost shrimp Sergio mericeae, a new species from south Florida, with reexamination of S. guassutinga (Crustacea: Decapoda: Callianassidae) Raymond B. Manning and Darryl L. Felder (RBM) Department ofInvertebrate Zoology, National Museum ofNatural History, Smithsonian Institution, Washington, D.C. 20560, U.S.A.; (DLF) Department ofBiology, University ofSouthwestern Louisiana, Lafayette, Louisiana 70504, U.S.A. Abstract.—Sergio mericeae is here described from intertidal sandflats ofthe AtlanticcoastofFlorida, whereitshareshabitatswithNeocallichirusrathbunae and A^. grandimana. This new species, formerly identified with the Brazilian species, Sergio guassutinga (until recently assigned to Neocallichirus), bears a strongresemblancetoitsBraziliancounterpartinbodysize,theuniquedactylar dentition ofthe majorchela, and most othermorphologicalfeatures. However, these apparent sibling species can be distinguished on the basis ofbody col- oration and subtle but consistent differences in the third maxilliped and major cheliped.ImmaturespecimensfromLouisiana,TexasandTamaulipas,Mexico, strongly resemble topotypic juveniles from Fort Pierce, Florida, and suggest that S. mericeae ranges into the western GulfofMexico. Uniqueness ofthe species described be- ed on by Biffar (1971), as many specimens lowwas recognized in the course ofour on- upon which his earlier records were based going effort to document diversity of in- were lost in a laboratory fire just prior to faunal decapods inhabiting intertidal sub- publication ofhis work. strates of the Indian River Lagoon on the Recent studies of the American Calli- Atlantic coast ofFlorida. Our collecting ef- anassidae have revealed a number ofcases forts in this region of marked tropical to wherespeciesformerlythoughttobeofwide warm-temperate faunal transitions have distribution were actually complexes com- employed yabby pumps (Hailstone «& Ste- prised of regionally endemized species phenson 1961, Manning 1975) for extrac- (Felderetal. 1991, Felder&Manning 1994, tion ofa speciose assemblage ofthalassinid Felder & Rodrigues 1993, Manning 1993). ghostshrimpandassociated fossorial forms. In the context ofthose patterns, the previ- Materials from thisregion haveledto com- ous report of the Brazilian Callianassa parative studies of thalassinids from guassutinga Rodrigues from south Florida throughout the western Atlantic, as well as (Biffar 1971) suggested such an extensive systematic revisions and new distribution range that we were led to question the con- records, especially for members ofthe Cal- specific assignment of its northern and lianassidae (Felder & Manning 1994; Man- southernpopulations. AsmaterialsthatBif- ning 1987, 1993; Manning & Felder 1986, farassignedtothisspeciesfromFloridawere 1991, 1992; Manning & Heard 1986; Man- for the most part destroyed in the afore- ning & Lemaitre 1994; Rodrigues & Man- mentioned fire (see Biffar 1971), detailed ning 1992). Collectionofnewmaterialsfrom comparisons with the Brazilian form were Florida was essential in order for us to re- delayed until we could accumulate an ad- examine the populations previously report- equate series of adult specimens from the VOLUME NUMBER 108, 2 267 Roridapopulation. Inthecourseofmaking drigues, 1966, 1971].-Abele & Kim, those collections, we photographically doc- 1986: vii, 26, 294, 296, 298, figs, a-c on umented coloration in northern popula- 299.-Williams et al., 1989: 28, 61. tions which differed markedly from report- "nearCallianassaguassutinga'\—Manning ed coloration ofthe Brazilian species (Ro- &Felder, 1989: 16. C drigues 1966, 1971), and this further en- Callianassa(nr. guassutinga).—Rabalais couraged us to undertake detailed etal., 1989: 35. & morphological studies and the present de- Sergio sp.-Staton Felder, 1995: 505. scription ofa new species. Sergioguassutinga.—Manning&Lemaitre, Material examined is listed by location 1994: 40 [Florida record only. Not listed followedbydate, collector(coll), numberof and figured Brazilian materials]. = specimens per sex and condition (mutl mutilated, ov = ovigerous, immat = im- Type material—Holotype: North side of mature), and museum number. Size is ex- Fort Pierce Inlet, Florida, island immedi- pressed as postorbital carapace length (cl) atelywestofCoon Island, St. LucieCounty, or total length (tl) measured in millimeters IndianRiverLagoon,intertidalsandflatjust (mm). The holotype and some paratypes of shoreward of sparse seagrass, 27°28.2'N, Sergio mericeaehave been deposited in the 80°18.8'W, 20 May 1994, coll D. L. Felder National Museum of Natural History and W. D. Lee, 1 5 (cl 29.8 mm), USNM (USNM), Smithsonian Institution, Wash- 268645. ington, DC. Paratypes have been deposited Paratypes: Same site as holotype, 6 Mar in the University of Southwestern Louisi- 1985, coll W. D. Lee and S. Petry, 1 6 (cl ana Zoological Collections (USLZ), Lafa- 28.3 mm; tl 106 mm), USNM 268682; 5 yette, Louisiana, theHarborBranchOcean- Mar 1985, coll W. D. Lee and S. Petry, 1 ographicMuseum(HBOM;formerlytheIn- mutl S (cl ca 30 mm), USNM 268683; no dian River Coastal Zone Museum, date, coll W. D. Lee and S. Petry, 1 9 (cl (IRCZM), Fort Pierce, Florida, and the 31.1 mm;tl 115 mm),USNM268684;north Florida Marine Research Institute Inver- side ofFortPierce Inlet, Florida, Dynamite tebrate Collection (FSBC-I), St. Petersburg, Point site near Fort Pierce Inlet State Park, Florida. Comparisons with the Brazilian St. Lucie County, Indian River Lagoon, speciesSergioguassutingawerebasedupon 27°28.3'N, 80n7.8'W, 12 Aug 1989 (RBM the published figures and descriptions by station FP 89-5), coll D. L. Felder and R. Rodrigues(1966, 1971)andexamination of Brown, 1 5 (cl 20.4 mm), USNM 268685; a mature female from Aracaju, Brazil 3 Jun 1993, coll D. L. Felder, 1 $ (cl 10.7 (USNM 268644), herein illustrated, as well mm; tl 35.8 mm), USLZ 3542; north side as comparisons with a female topotype of Fort Pierce Inlet, Florida, Coon Island, (USNM 221802), a male paratype (USNM St. Lucie County, Indian River Lagoon, 256886), a male from Praia de Pirangi-Sul, 27°28.2'N, 80°18.2'W, 3 Apr 1985, coll W. Rio Grande do Norte, Brazil (USNM D. Lee and S. Petry, 1 c5 (cl 31.1 mm; tl 221810), and a female specimen from Na- 115.2 mm), USNM 268686; 16 Jul 1994, tal, Rio Grande do Norte, Brazil (USNM coll W. D. Lee, 1 9 (cl 27.1 mm; tl 105.6 221804). mm), USLZ 3543; north side ofFort Pierce Sergio Manning & Lemaitre, 1994 Inlet,Florida,northeastofCoastGumardSta- tion, near exposed sand bar, 0.3 depth, Sergio mericeae, new species 25 Apr 1972, coll H. B. Russell, 1 d (cl 29.7 Figs, la-f, 2a-f, 3a-f, 4a-f, 5a-g mm; tl 1 18 mm),HBOM 89:103; south side — Callianassaguassutinga. Biffar, 1971:651, ofFort Pierce Inlet, Florida, intertidal sand 653, 674, figs. 9, 10 [VirginaKey, Miami, barjust north ofand separated by shallow Florida.NotCallianassaguassutingaRo- channel from U.S. Highway AlA causeway 268 PROCEEDINGSOFTHE BIOLOGICALSOCIETYOFWASHINGTON between Fort Pierce and South Hutchinson coll D. L. Felder, W. D. Lee, and P. Mik- Island, St. Lucie County, Indian River La- kelsen, 1 6 (cl 17.0 mm), USNM 268698; 1 goon, 27°27.7'N, 80°18.7'W, 23 Jul 1985 6 (cl 14.5 mm, photographic voucher), (RBM station FP 85-4), coll R. B. Manning USLZ 3547, 2 66 (cl 13.4, 13.8 mm), 2 mutl and D. L. Felder, 1 mutl 2 (cl ca. 29 mm), ov 22, FSBC-I 47980; 8 Sep 1985, coll W. USNM268687; 12Aug 1986 (RBM station Lee and P. Mikkelsen, 1 6 (cl 16.0 mm), FP 86-4), coll R. B. Manning, D. L. Felder, USNM 268699; 23 July 1994, coll D. L. and W. D. Lee, 1 mutl 6, USNM 268688; Felder, J. M. Felder, R. D. Felder, and W. 15 Aug 1986 (RBM station FP 86-7), coll D. Lee, 222(cl 1 1.9, 18.5 mm),USLZ3548; R. B. Manning, D. L. Felder, and W. D. Seaquarium Flats, Virginia Key, Dade Lee, 1 mutl (5 (cl 13.7 mm), 2 ov 22 (1 mutl, County, Florida, 29 Feb 1964, coll S. Dob- other cl 30.5 mm; tl 114.9 mm), USNM kin, 1 2 (cl 10.3 mm; tl 37.4 mm), USNM 268689; 2 Mar 1987 (RBM station FP 87- 122732. 2), coll R. B. Manning and W. D. Lee, 2 SS Other material examined. —Louisiana: male (cl 9.1, 9.4 mm), USNM 268690; 3 Just off" Cat Island Pass, mouth of Terre- Mar 1987 (RBM station FP 87-4), coll R. bonne Bay, 28°56.8'N, 90°33.7'W, trawl, B.ManningandW.D.Lee, 1 mutl2,USNM depth of 12-13 m, 12 Jul 1984, coll N. N. 268691; 5 Mar 1987 (RBM station FP 87- Rabalais and students, 5 mutl immat (cl 6), coll R. B. Manning and W. D. Lee, 2 $6 6.5-7.9 mm), USLZ 3549. Texas: Port Is- (cl 10.4, 17.5 mm), USNM 268692; 17 Apr abel,Texas, lowerLagunaMadrenearBraz- 1988 (RBM station FP 88-1), coll R. B. osSantiagoinlet, muddysandflatjustnorth Manning and M. Schotte, 1 mutl 6 (cl ca. of mainland end of old abandoned cause- 15 mm), USNM 268693; 1 Jun 1993, coll wayto South Padre Island, CameronCoun- D. L. Felder, 1 2 (cl 26.5 mm, dissected for ty, Jul 1991, coll D. L. Felder, J. M. Felder hindgut study), USLZ 3544; 2 Jun 1993, and R. D. Felder, 1 mutl 2 (cl 10.4 mm), coll D. L. Felder, 1 S (cl 12.3 mm, dissected USLZ 3550. Mexico: Barra del Tordo, Ta- forhindgutstudy),USLZ3545; 6Aug 1993, maulipas, Mexico, depthca. 0.3 m, margins coll D. L. Felder and J. M. Felder, 1 2 (cl of sandy Halodule flat just inside inlet at 14.0 mm), USLZ 3546; St. Lucie, Rorida, mouthofRioCarrizalestuary, 24May 1982, intertidal unvegetated sand flat just inside coll D. L. Felder and R. K. Tinnin, 5 66 (cl St. Lucie Inlet, Martin County, Indian Riv- 9.5, 9.7, 9.9, 10.6, 12.0 mm), 3 22 (cl 9.5, er Lagoon, 27°10.5'N, 80°10.4'W, 11 Feb 10.6, 10.8), USLZ 3551 (two are photo- 1983 (RBM station FP 83-2), coll R. B. graphic vouchers). Manning, W. D. Lee, and H. Schiff; 3 66 (cl Diagnosis.—Front ofcarapace with three 8.3, 9.2, 10.2 mm), USNM 268694; Lake small spinous anterior projections, usually Worth Inlet, Florida, intertidal, sparsely subequalorwithmedialslightlylongerthan vegetated, sandytoshelly-sandflatsonnorth laterals. Eyestalks broad, tapered over side ofPeanut Island, Palm Beach County, length, usuallyterminatedinspine, tubercle 26°46.7'N, 80°2.9'W, 4 Mar 1987 (RBM or acute angle, often not reaching to distal station FP 87-5), coll R. B. Manning and endoffirstantennularsegment. Thirdmax- W. D. Lee, 3 22 (cl 10.6, 18.7, 30.0 mm), illiped with dactyl arched and propodus USNM 268695; 10Aug 1987 (RBM station broad,heightofpropodusgreaterthanlength 87-8), coll D. L. Felder, W. D. Lee, P. Mik- ofdactyl; diagonal length ofmerus-ischium kelsen, and R. Bieler, 1 6 (cl 12.5 mm), less than or equal to 2 times width atjoint USNM 268696; 1 1 Aug 1987 (RBM station between these articles. Major cheliped of 87-9), con D. L. Felder and W. D. Lee, 2 adultswith inferior margin ofmerus armed 66 (1 mutl, other cl 27.2 mm), USNM proximallybyelongate process of2-3 fused 268697; 12Aug 1987 (RBM station 87-10), spines, beyond which is short gap in mar- VOLUME NUMBER 108, 2 269 ginal dentition, lateral surface with low, closely opposed over proximal portion of rounded longitudinal carina; carpus about midline, divergent terminally; weakly sin- halfas long as palm; dactylus shorter than uous anterolateral margin arching from palm, cutting edge with rectangular tooth broad base of eyestalk to anterior taper, proximally, acute recurved tooth at mid- joiningmesialmarginanteriorlyin variable length, and seriesofsmalleracuteteeth dis- terminus,endingasspinule,tubercleoracute tally. Minor cheliped with dactylus usually comer; rarely with subterminal spinule or longer than palm. Uropodal exopod with tubercleinadditiontoterminalone. Cornea dorsalplatemuch shorterthanventralplate. dark, area ofpigmentation sexually dimor- Telson with posteriormargin weakly emar- phic; inboth sexes, roundedcorneal surface ginate. is small, subterminal, anterolateral in po- Description.—Adults of relatively large sition, larger relative to eyestalk and more size, with postorbital carapace lengths bulbousin immaturethaninadultanimals; mm sometimes >30 and total lengths oc- in adult males, pigmented area large, often casionally >1 10 mm. diffuse, almost broad as stalk, often occu- Frontal margin ofcarapace (Figs, la, 5a, pying much ofdistal third to % ofeyestalk; b) with three anterior prominences, each in adult females and juveniles, pigmented acute or terminated by short spine, median area smaller, more restricted to area of ofwhich is slightly more produced on tri- rounded corneal surface. angular base to form rostrum, lateral of Antennularpeduncle shorterand heavier whichoverlie innermargins ofantennal pe- than antennal peduncle, terminal article duncles; low, obtuse tooth on anterolateral slightly longer than penultimate and reach- margin just lateral to outer margin of an- ing to or beyond midlength ofterminal ar- tennal peduncle. Rostrum extending less ticleonantennalpeduncle; penultimateand than V3 visible length ofeyestalks in dorsal terminal articles of peduncle with ven- view. Carapace lacking rostral carina, with tromesial and ventrolateral rows oflong se- distinct linea thalassinica, and with a de- tae, those ofventrolateral rowlonger, dens- fineddorsalovalmarkedposteriorlybydeep er, andcontinuedonto ventralramusoffla- transversecardiacfurrow, furrowextending gellum; ramiofflagellum subequalinlength, anteroventrally to either side above linea 4-5 times length ofterminal article ofpe- thalassinica as shallow sinuous groove de- duncle; dorsal ramus with sparse tufts of marcating posterior half of dorsal oval. long setae, distal halfwith heavier articles Shallow cervical groove originating imme- bearing dense tufts of short ventral setae, diately below linea thalassinica on anterior articles comprising tapered tip with dense halfofbranchiostegite and curved antero- line of short ventral aesthetascs. Antennal ventrally, intersecting raised sinuous ridge peduncle with penultimate article subequal in anteriorthird ofbranchiostegite; portion to or slightly longer than terminal article; ofridge anterior to intersection positioned basal article with dorsolateral carina above ventrolaterallyto roundedhepaticboss and laterally produced excretory pore; second usually sculpted by weak crenelations on article with deep, diagonal ventral suture, upper surface. Subantennular region ofep- distolaterally with single tuft ofsetae, small istome with dense tuft oflong setae brack- rounded vestige ofdorsal scale articulated eting those ofantennular peduncle. atjoint with third article; third article elon- Eyestalks flattened, weakly concave dor- gate, narrower than second, slightly longer sally, length equal to or slightly less than 2 than combined lengths of first two, proxi- timesbasalwidth, indorsalviewtipsreach- molaterally with partially fused condylar ing to or nearly to distal end of basal an- process articulated to distolateral extreme tennal article; mesial surfaces of eyestalks ofsecondarticle;fourtharticlenarrowerthan 270 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON b,d,f,h,i c_ 29.F8ig.mm1).,SUerSgNioMme2r6i8c6e4a5e,;nd,ewe,sfpeemciaelse,ptayrpaetmyaptee(rcilal2s6.f5rommm)F,orUtSPiLeZrc3e5I4n4l.et,a.FCloarriadpaa;cae-cf,rofn,tm,aelyeeshtoallkost,ypbeas(acll antennal segments, dorsalview, setaenot shown; b, Majorchelipedofmaturemale, carpusandchela, external surface; c, Major cheliped ofmature male, ischium and merus, external surface; d, Major cheliped ofmature female, carpus and chela, external surface; e. Major cheliped ofmature female, ischium and merus, external surface; f, Telson, uropods and part ofsixth abdominal segment, dorsal view. Sergioguassutinga (Rodrigues) fromAracaju,Brazil,female(cl23.5mm),USNM268644;g,Carapacefront,eyestalks,basalantennalsegments, dorsal view, setae not shown; h. Majorchelipedofmature female, carpus andchela, externalsurface; i, Major chelipedofmaturefemale,ischiumandmerus,externalsurface;j, Telson,uropodsandpartofsixthabdominal segment, dorsal view. Scale linesindicate 5 mm. VOLUME NUMBER 108, 2 271 third; flagellum 2-2.5 times length of an- carpus short; propodus slightly arcuate, tennular flagellum. heaviest distally, length almost 3 times Mandibles (Fig. 2a) with large, width; dactylus short, about Vs length of 3-segmentedpalp, elongatedthirdarticle of propodus, with terminal brush ofstiff"bris- palp slightly tapered and terminally round- tles; exopod phylloform, nearly as long as ed,longsetaeonexternalanddistalsurfaces endopodalmerus,marginallyfringedbylong ofsecond article and on proximal extensor setae; epipodsmall, sutures subdividinginto surface ofthird, field ofshort setae on most 2 proximal lobes and minute trianguliform ofextensorsurfaceandterminalendofthird terminal lobe. Third maxilliped (Figs. 2f, article; incisor process with well-defined, 3a) without exopod; endopod with long, terminally corneous teeth on cutting mar- dense setation on mesial margin, terminal gin,teethlargest,lesscoalescedonproximal 3articlesalsowithlongsetationonextensor two thirds ofcutting margin, internal sur- margins; length ofendopodal merus-ischi- face with lip giving rise to molar process um about 2 times width; ischium subquad- proximaltoincisorteeth,molarprocesswith rate, slightly longer than broad, diagonal 4-6smallmarginalteeth;paragnath(notfig- length in adults about 1.6 times width at ured) rounded, scaliform, poorly sclero- suture with merus, proximomesial margin tized, set against and below molar process. forming subacute comer, internal surface First maxilla (Fig. 2b) with endopodal palp withpoorlydefined, longitudinallyoriented long, narrow, terminal article deflected elevation bearing curved row ofsmall den- proximally at articulation; proximal endite ticles; merus subtriangular, distinctly densely setose on sinuous margin, terminal broader than long; carpus heavy and sub- lobe additionally with field oflarge, termi- triangular, with setose lobe on flexor mar- nally bifurcate setae; distal endite elongate, gin, internal surface with dense field offine proximally narrow, broadening terminally setae in distal third; propodus large, where armed with short stiff* bristles and subquadrate in adults, height often exceed- fieldofshortsetae, somewithbifurcatetips; inglength, internal surfacewithnarrowme- exopodite low, truncate and setose. Second dian field of fine, dense setae, opposable maxilla (Fig. 2c) with endopod narrowed margin slightly emarginate; dactylus nar- distally, first and second endites each lon- row,arcuate,inadultsdistinctlyshorterthan gitudinally subdivided, internal surface of height of propodus, terminally with small first endite fused to broad, rounded, mar- brush ofstiff"bristles. ginally setose plate; exopod forming large, Branchial formula includes exopods and broad, scaphognathite. Firstmaxilliped(Fig. epipods as described for first and second 2d) with proximal endite narrowly pro- maxillipedsabove;branchiaelimitedtosin- duced, dentiform, marginally setose; distal gle rudimentary arthrobranch on second endite robust, subquadrate, mesial half of maxilliped, pair ofarthrobranchs on third externalsurfaceandmarginsheavilysetose, maxilliped, and pair of arthrobranchs on longest setaeterminal, internal surface con- each ofthe first through fourth pereopods. cave; exopod ovoid, divided by transverse First pereopods oftwo sides forming dis- suture marking notch on mesial margin, similar chelipeds, major cheliped heavy, longestsetaeinfieldonexternalsurfaceand massive in adults ofboth sexes (Fig. Ib-e), mesial margin proximal to notch; epipod much less altered from minor cheliped in large,broad, anteriorendtaperedtonarrow juveniles than in adults (Fig. 5c-f). Major terminus. Second maxilliped (Fig. 2e) with cheliped ofadults strongly calcified; ischi- long, narrow endopod; endopodal merus um slender, superior margin weakly sinu- length exceeding 4 times width, flexor mar- ous, inferior (flexor) margin with row of ginwithdensefringeoflong, close-setsetae; minutedenticles; merusabouttwiceas long 272 PROCEEDINGSOFTHE BIOLOGICALSOCIETYOFWASHINGTON a,b,c,d,e Fig. 2. Sergio mericeae, newspecies, typematerialsfromFortPierceInlet, Rorida;a-e, femaleparatype(cl 26.5 mm), USLZ 3544; f, male holotype (cl 29.8 mm), USNM 268645, right mouthparts. a, Right mandible, externalsurface;b,Firstmaxilla,externalsurface;c.Secondmaxilla,externalsurface;d.Firstmaxilliped,external surface;e,Secondmaxilliped,externalsurface,rudimentaryarthrobranchnotshown;f,Thirdmaxilliped,internal surface. Scalelinesindicate 5 mm. as high, superior margin weakly sinuous, length about %q ofheight, superior margin sometimes with few minute tubercles prox- nearlystraight,formingthinunserratedkeel imally, inferior margin more strongly ar- slightly overhanging internal surface, prox- cuate, proximally with strongprojecting of- imoinferior margin regularly rounded in ten bifurcate process of 2-3 fused spines, outline, serrations ofkeel most evident on margindistaltoprocesswithshortunarmed internalsurface;propodusheavy,length(in- regionbeyondwhichmarginislinedbysmall cluding fixed finger) in large adults about inferodistally directed teeth; carpus broad, 1.7 timesheight, heightgreatestbasally, su- relatively shorter and higher in adults than perior margin ofpalm forming unserrated in immature specimens, in large adults keel, especially in proximal half, inferior VOLUME 108, NUMBER 2 273 Fig. 3. Sergiomericeae, newspecies, typematerialsfromFortPierceInlet,Florida;a,b, femaleparatype(cl 26.5 mm), USLZ 3544; c-f, male holotype (cl 29.8 mm) USNM 268645. a. Right third maxilhped, external surface, setae not shown; b. Minor cheliped, internal surface; c. Right second pereopod, external surface; d. Rightthirdpereopod,externalsurface;e,Rightfourthpereopod,externalsurface;f.Rightfifthpereopod,external surface. Sergio guassutinga (Rodrigues) from Aracaju, Brazil, female (cl 23.5 mm), USNM 268644: g, Right third maxilliped, external surface, setae not shown; h. Minor cheliped, internal surface. Scale lines indicate 5 surface with serrated keel most developed to unarmed; dactylus (movable finger) sub- proximally, usually with 2-3 sharp short equal in length to palm, prehensile margin spinesorteethonexternalsurfacejustprox- atmidlengthwithlarge, hookedacute tooth imal to gape; fixed fingerin adultswith pre- bearing a single setose punctum at its base, hensilemarginrangingfromstronglyserrate separated proximallyby deep emargination 274 PROCEEDINGSOFTHE BIOLOGICALSOCIETY OFWASHINGTON from a single heavy, quadrate basal tooth, minated in slightly comified tip hooked to- and distally by another deep emargination ward external side, external surface densely fromserratemarginondistalthirdoffinger, setose, setae arranged in transverse bands finger terminated in acute, hooked tip. on superior half. Minorcheliped(Fig. 3b)slender, elongate Fourth pereopod (Fig. 3e) subchelate, in- in adults; ischium narrow, unarmed; merus ferodistal comer of propodus produced to elongately ovoid, length subequal to or form short fixed finger; soft dense setation slightly less than 2 times height, subequal on outer surface ofpropodus and dactylus, to length of ischium; carpus rectangular, that of propodus divided into upper and slightly longer than merus, length twice lower fields, setae slightly longer in lower height, smooth; chela about as long as car- field which continues onto lower halfofin- pus;palmsubrectangular,lengthslightlyex- ternal surface; dactyl terminated in narrow ceeding height; fixed finger subequal in tip hooked toward external side. length to palm, prehensile margin weakly Fifthpereopod (Fig. 3f) minutely chelate, serrate; dactylus (movable finger) in adults opposable surfaces ofpropodusand minute consistently exceeding length ofpalm, pre- dactylus excavate, spooned, terminally hensile margin very weakly serrate. rounded, forming beak-like chela obscured Second pereopod (Fig. 3c) chelate, patch- by dense fields of setation on distal Vi of es oflong setae on inferior margin ofischi- propodus and superior surface ofdactylus; um, most of flexor margin on merus and corneous prehensile lip ofpropodus pecti- both margins of carpus lined with evenly nate. spaced long setae, inferior margin ofprop- Anteriorabdominal somites smoothdor- odus with similar long setae proximally, sally, surface sculptureofthirdthroughfifth progressively more reduced in length and tergites progressively more pitted, eroded, stiffened distally, subterminally becoming or undulated in appearance; second tergite densepatchofshort, stiff"bristles;prehensile withtuftoflongsetaeonposterolaterallobe; marginsofboth fingerscorneous, finelyand thirdthrough fifthtergiteseachwithasmall uniformly microserrate along straight edge broadly transverse field ofvery soft dense over most oflength in both, microserration setae on the lateral lobe; sixth with distinct terminated distally in thickened corneous transverse, terminal, posteriorly facing tips offingers; superior margin ofdactylus groove above telson. slightlysinuous,withlongmarginalsetation First pleopod ofmale and female unira- becoming increasingly shorter length dis- mous, composed of2 articles; in male (Fig. tally, replaced by dense patch ofshort stiff" 4a), distal article subequal in length to or bristles subterminally; external surface of slightly shorter than proximal, subdivided carpus, propodus and dactylus with scat- into 2 lobes by weak longitudinal furrow, tered patches ofshort setae. in mature male anterior lobe terminally Third pereopod (Fig. 3d) merus length rounded, posterior lobe terminally acute about 3 times width; carpus broadest dis- with tip directed anteroventrally; in female tally, terminally with large patches oflong (Fig. 4b)proximalarticlesubequalinlength setaeoverreachingpropodus; propoduswith to terminal article, terminal article with strong proximally directed lobe on inferior weaklyproducedshoulderjustbeyondmid- margin, lobe terminally with long distally length. Second pleopod ofmale and female directedsetaegivingwaytosubdividedtufts biramous; in male (Fig. 4c), dense setation of slightly shorter setae along inferodistal largely restricted to tufts on lateral margin margin, superior margin with field oflong ofexopod, distal extreme ofexopod, lateral setae, patternedtufts oflightersetae onout- margin ofendopod and appendix masculi- er face ofarticle; dactylus tear-shaped, ter- na, appendix masculina weakly separated VOLUME 108, NUMBER 2 275 fromandnotoverreachingendofdistallobe of live specimens).—Variable and fading ofendopod, no evidence ofappendix inter- quickly to opaque white in alcohol. In life na; in female (Fig. 4d, e), both rami with most adult specimens with violet pink to long setae, appendix interna small and rose pink ground color, occasionally very acutely tapered distally. Third to fifth pleo- pale; usually with darker pink to scarlet or podpairs(Fig. 4f)forminglarge, posteriorly orange-red on the chelae, cardiac region of cupped fans when coupled at mesial mar- carapace, dorsal tergites ofabdominal seg- ginsofendopods;endopodofeachsubtrian- ments 1-2, mid-dorsal and posterior ex- gular, appendix internaembedded into me- tremesofabdominaltergites3-5,telsonand sial margin ofendopod. uropods. Sixth abdominal tergite usually Telson (Figs. If, 5g) broader than long, with 2 faint, reddish longitudinal bands to subhexagonal, broadest at lateral lobes at either side ofmidline in anterior %. Juve- midlength or in anterior half, posterior niles often with striking scarlet red to rosy emargination producing pair ofweak lobes red coloration almost overall, but also with or obtuse posterolateral comers, each ter- pigment deepest in same body areas as in- minated by a tuft oflong setae; dorsal sur- dicated for adults above. face with low, lightly setose boss near each Known rangeandhabitat.—Known from anterolateral comer, medially with subdi- intertidal to shallow subtidal in the Indian videdshorttransversecarinaborderedpos- River Lagoon and along the lower Atlantic teriorlybyline ofsetae. Uropodwith acute, coast ofFlorida, USA, and (on the basis of posterolaterallydirectedspineonprotopod, juveniles only) from coastal GulfofMexico spine overreaching anterolateral margin of localitiesinLouisiana,southTexas,andTa- endopod; endopod broad, trapezoidal, maulipas, Mexico. The single immature slightly longer than broad, dorsal surface specimen of Sergio collected from Maya- with tuft of long setae near posterolateral guez, Puerto Rico, in 1934 (coll: V. Biaggi, comer, setae of posterior margin longest Jr., tl 73 mm, USNM 77462) which was posterolaterally; exopod with anterodorsal previouslyreportedasS.guassutingabyBif- platefallingwellshortofdistalexopodmar- far (1971) may or may not be correctly as- gin, distal edge of plate lined with short, signed to that species, but we must defer thickspiniformsetaegradingtothinnerlon- this determination until additional, fully ger setae of exopod margin and long stiff, mature and better preserved materials of spiniform setae at posterodistal comer of thatsoutherlypopulationbecomeavailable. plate, distal margin of exopod with dense While most specimens have been taken fringe ofsetation, fringe diminishedandre- with yabby pumps from intertidal to shal- placed by row of short spiniform setae on low subtidal substrates, specimens from off posterior margin. Louisianawere taken in atrawl deployed at Size.—Among the materials examined, a depth ofapproximately 12-13 m. In vir- the largest male (cl 31.1 mm; tl 1 15 mm) tually all cases, the animals appear to be and largest female (cl 30.7 mm; tl 1 15 mm; distributedwithin ornearinletsto the open ovigerous) were both taken from the im- ocean. IninletsoftheIndian RiverLagoon, mediate vicinity ofFort Pierce Inlet, Ror- wheretheyburrowalongsideNeocallichirus ida. Eggs on ovigerous specimens are small rathbunae, they typically occupy less vege- with sizes (max. diameter) after preserva- tatedareasofsandbars,oftenjustshoreward mm tion ranging from 0.58-0.62 for im- ofwhere larger mounds ofejecta mark the mature eggs without developed eyespots to burrowsofA^. rathbunae. Atleastin shallow mm 0.62-0.68 for more mature eggs with waters, adults ofSergio mericeae appear to well developed eyespots. havemud-linedburrowswith surfaceopen- mm Color(from notes and color photographs ings6-10 indiameter, andmay ormay