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Crustacea: Decapoda: Thalassinidea) 11 June 1992 PROC. BIOL. SOC. WASH. 105(2), 1992, pp. 324-330 TWO NEW CALLIANASSID SHRIMPS FROM BRAZIL (CRUSTACEA: DECAPODA: THALASSINIDEA) Sergio de A. Rodrigues and Raymond B. Manning Abstract. —Biffarius delicatulus and Eucalliax cearaensis are described from Brazil. Each species is the third of their genus to be recorded from the western Atlantic and the first of their genus known from South America. Among the unstudied callianassids ac­ Diagnosis.—Size very small, cl less than cumulated by the senior author since his 7 mm in adults. Telson subquadrate, un­ review of the Brazilian callianassids (Ro­ armed. Mxp3 ischium-merus operculiform, drigues 1971) are two previously unde- without exopod, inner surface without crest scribed species. One of these is referable to or teeth. Male with one form of cheliped, the genus Biffarius and the other to Eucal­ merus of both chelipeds with ventral hook. liax; both of these" genera were recently Plp2 of male small, uniramous. Uropods erected for American species by Manning unarmed. &Felder(1991). Description.—Carapace smooth, with The holotypes have been deposited in the dorsal oval, without cardiac prominence, Museu de Zoologia, Universidade de Sao cervical groove distinct, linea thalassinica Paulo, Sao Paulo, Brazil (MZUSP) and distinct, parallel to longitudinal axis of body; paratypes are in that collection and in the rostrum short; lateral frontal projections ab­ National Museum of Natural History, sent. Smithsonian Institution, Washington, D.C. Abdominal somites smooth, somite 1 (USNM). saddle-like, shorter than others; somite 2 Carapace length (cl) is postorbital cara­ longer than others, with small tuft of setae pace length in millimeters (mm). Other ab­ on posterolateral margin; somites 3-5 sub- breviations used include: Al, antennule; A2, equal in length, each with small lateral row antenna; leg., collector; m, meters; Mxpl-3, of setae; somite 6 about as long as telson, maxillipeds 1-3; P1-5, pereopods 1-5; Plpl- with small posterolateral rows of setae. Tel­ 5, pleopods 1-5. son subquadrate, slightly wider than long, with 1 tuft of setae on mid-dorsal surface, 2 other tufts near extremities of distal mar­ Biffarius delicatulus, new species gin. Fig. 1 Eyes flattened, slightly convex, about as Material. —Brazil, State of Sao Paulo: Sao long as first segment of Al peduncle, exter­ Sebastiao, Praia de Enseada [city of Sao Se- nal margins moderately convergent, mesial bastiao = 23°40'S, 45°20'W], dug from sand margins parallel up to level of cornea, there at low tide, 3 Jun 1981, leg. S. Rosso: 1 S, divergent towards pointed tips; cornea cl 3.8 mm (paratype, USNM 252546).-Sao rounded, darkly pigmented, subterminal. Sebastiao, Praia do Ara§a, collected in sand Al peduncle reaching slightly beyond tip at low tide with yabby pump, 18 May 1985, of penultimate segment of A2 peduncle; seg­ leg. S. A. Rodrigues: 6 S, cl 4.0-6.8 mm, 2 ment 3 twice as long as segment 2, segment 2, cl 4.3, 4.4 mm (1 S is holotype, MZUSP 1 a little longer than segment 2; flagellum 10582; other specimens are paratypes, shorter than peduncle. A2 peduncle with MZUSP (uncat.) and USNM 252547). segment 4 slightly shorter than segment 3 VOLUME 105, NUMBER 2 325 Fig. 1. Bijfarius delicatulus, new species, a. Lateral view; b, Carapace and anterior appendages; c, Front and eyes; d, Mandible; e, Maxilla 1; f. Maxilla 2; g, Mxpl; h, Mxp2; i, Mxp3; j, Major cheliped of male; k. Minor cheliped of male; 1, P2; m, P3; n, Left cheliped of female; o, Right cheliped of female; p, P4; q, P5; r, Male Plpl; s, Male Plp2; t, Female Plpl; u, Female Plp2; v, Plp4; w, Telson and left uropod. a-m, p-s, v-w, male paratype, cl 4.0 mm; n-o, t-u, female paratype, cl 4.3 mm. 326 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Table 1. —Gill formula oiBiffarius delicatulus. Maxiliipeds Pereopods Pleurobranchs Arthrobranchs Podobranchs Epipods Exopods and as long as segment 1 and 2 together; portion serrated; carpus about 1.5 times antennal scale small; flagellum about 3 times longer than wide; palm shorter than carpus, longer than peduncle. slightly longer than wide; fingers shorter than Mandible with 7 sharp teeth on incisor palm, gaping, tips acutely pointed, cutting process; molar process unarmed; palp edges minutely serrated. Smaller cheliped 3-segmented, segment 3 longer than seg­ of male with ischium smooth, merus usually ments 1 and 2 combined. Maxillule with with small, acute hook at midlength of pos­ broad protopodal endites; palp slender, with terior margin (absent in 1 specimen); carpus curved tip. Maxilla with protopodal endites longer than other joints, length about 3 times bilobed; palp slender, reaching slightly be­ width; propodus widening distally; fingers yond middle of basal endite; exopod broad, subequal, curved, longer than palm, sharply with crenulated margins bearing equally- pointed, with some serrations on cutting spaced setae, longer on distal margin. Mxp 1 edges. Females with both chelipeds of same with protopodal endites as illustrated (Fig. size and shape, differing from small cheliped Ig); palp small but distinct, longer than wide; of male only in setation and proportions of exopod appearing articulated, distal portion carpus (2.2 rather than 3 times longer than with crenulated margin bearing long setae; wide). epipod divided by constriction, anterior P2 with fingers not gaping, cutting edges portion short and truncate, posterior por­ straight, smooth. P3 with ischium and me­ tion produced into curved lobe. Mxp2 with rus of about same width, merus longer than endopod 5-segmented, as illustrated (Fig. ischium; carpus broadening distally; prop­ Ih); exopod unsegmented, shorter than en- odus wider than carpus, anterior and pos­ dopodal merus; protopod with small setose terior margins convex, posterior margin exopod, lacking arthrobranch. Mxp3 ischi- mjjch longer than anterior; dactylus as long um-merus operculiform; ischium 1.5 times as wide, with rounded tip. P4 with posterior wider than long, mesial surface with sparse margin of propodus bending towards dac­ small setae, without crest or teeth; merus 2 tylus, lacking subchelar projection. P5 dis­ times wider than long, proximal margin as tinctly chelate, fingers small, tips curved. long as distal margin of ischium, 4 times Branchial formula, differing from normal wider than carpus and prodopus; propodus callianassid formula in complete absence of longer than wide, only slightly wider than arthrobranch on Mxp2, as shown in Ta­ digitiform dactylus. ble 1. Larger cheliped of male with ischium Plpl of male uniramous, 2-segmented; smooth, unarmed; merus with anterior distal segment spatulate, with 5 long apical margin smooth, posterior margin produced setae. Plp2 rudimentary, uniramous, 2-seg­ into distally directed hook and with distal mented; distal segment with 1 short apical VOLUME 105, NUMBER 2 327 seta. Plpl of female uniramous, 2-seg- leg. S. A. Rodrigues: 2 3, cl 7 mm, 3 9, cl mented; proximal segment with a few sub- 6-7.2 mm (1 male is holotype, MZUSP terminal short setae; distal joint about 2 10583; other specimens are paratypes, times longer than proximal, with about 12 USNM 252546). small setae at midlength, 4 small subter- D/a^no5/s.—Rostrum short, not spined. minal slender setae, and 4 spiniform apical Carpus of chelipeds lacking distal acute pro­ setae. Plp2 of female biramous; endopod jections or spines. Male Plpl terminating in straight, with 5 terminal setae and a few single hook. setae scattered along its length; exopod sim­ Description.—Carapace about 'A as long ilar to endopod but curved. Plp3-5 with as body, lacking cardiac prominence, dorsal stubby, projecting appendices internae in oval, rostral spine, and rostral carina, cer­ both sexes. vical groove indistinct, present as suture; Uropodal endopod widening to its distal dorsal midline with 2 small rounded pits, extremity, about as long as broad, marginal one on anterior portion of gastric area, other setae delicate; exopod slightly longer than on caudal portion of cardiac area; linea thal- endopod, upper plate incomplete, distal assinica parallel to midline of body; rostrum margin convex, without strong setae. short; lateral frontal projections of carapace Etymology.—From the Latin, delicatus, inconspicuous. Abdominal somites smooth, delicate, as, like B. biformis and B. fragilis, somite 1 shortest, somite 2 longest; somites specimens are very easily damaged when 3-5 subequal in length, each with small lat­ handled. eral row of setae. Telson distinctly broader Remarks.—This species resembles B. bi­ than long, subquadrate, unarmed. formis (Biffar, 1971) and B. fragilis (Bilfar, Eyes flattened, extending slightly beyond 1970), the only other species assigned to the distal margin of first segment of Al, almost genus, but differs from both in having ves­ 2 times longer than wide; external margins tigial pleopods on the second abdominal convergent, internal margins parallel for somite of the male. It further differs from most of length, diverging near pointed tips; B. biformis in lacking spinules on the pos­ cornea distinct, darkly pigmented, subter- terolateral comer of the telson and in having minal. only one form of major cheliped in the male. Al peduncle about as long as A2 pedun­ It differs from B. fragilis in having a weak cle; segment 1 shortest, segment 3 longest; hook on the merus of the smaller cheliped, antennular flagellum about 1.5 times longer a relatively short antennular peduncle, and than peduncle. Antennal scale absent; an- no spinules on the inner face of the ischium tennal flagellum about 5 times as long as r\f \V\f^ fViit-H mQYillir^p»rl Ac in R hi-fnvwiiv peduncle. ^^A LXXV.J ^LLA-A.^^ iilk4^ViXXA^V/«^. A &LJ AAA. AJ . .J AJ \^ I ItAKJf the female of B. delicatulus lacks a major Mandible with molar process smooth, in­ cheliped—both chelipeds are of the same cisor process with about 10 small, unequal size and shape.
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