Speocarcinus granulimanus Rathbun, 1894

Brandão, Marianna, Coelho-Filho, Petronio Alves & Tavares, Marcos, 2012, A review of the genus Speocarcinus Stimpson, 1859 (Crustacea: Brachyura: Xanthidae), with a key to its species and the description of one new species, Zootaxa 3327, pp. 1-19 : 10-12

Speocarcinus granulimanus Rathbun, 1894

( Fig. 2B , D; 9A–B)

Speocarcinus granulimanus Rathbun, 1894: 242 .

Speocarcinus granulimanus — Faxon 1895: 236; Tesch 1918: 45; Rathbun 1918: 40; Garth 1961: 154; Guinot 1969: 710; Ng et al. 2008: 201; Brandão et al. 2010: 137.

Material examined. Lectotype, male cl 17.5 mm, cl 21.0 mm ( USNM 17461), Mexico, Gulf of California, off Point San Fermin, R/V Albatross, st. 3035, 30°21’00N–114°25’15W, gray mud, 54 m. Baja California, north of Punta Estrella, R/V Albatross, st. 3031, 31°06’45N– 114°28’15”W, 27.iii.1869, brown mud, 60 m: 1 female ( USNM not numbered). Baja California, Southwest of Ballenas Bay, st. 2837, 28 °10’00”N– 115°09’45”W, 5.v.1888, fine sand, 42 m: 1 juv. male ( USNM not numbered). Off Huatulco, Oayaca, S. A. Glassell coll., 03.vii. 1938, 91 m: 1 female ( USNM not numbered). San Felipe, Baja California, S. A. Glassell coll., 02.vi.1934, mud, 9 m: 2 juv. males, 1 juv. female ( USNM not numbered). Tenela, Gulf of Tehuantepec R/V Stranger, st. 5, Fred E. Lewis, coll., 01.ii.1939, 23– 32 m: 1 ovig. female, 1 male ( USNM not numbered). Tenacatita Bay, Mexico, R/V Stranger, st. 26, Fred E. Lewis coll., 25.iii.1929, 18– 32 m: 1 juv. male, 1 juv. female ( USNM not numbered).

Panama: Canal Zone, Pacific entrance to canal, suction dredge, H.O. Wright coll., iii.1967, F.A. Chace Jr. det., 1968: 1 juv. female ( USNM 125902).

Type locality. Point San Fermin, Gulf of California, Mexico, 30°21’00N–114°25’15W, 54 m.

Description of lectotype. Carapace wider than long, maximal width at fifth anterolateral tooth, minutely granular near margins, pitted dorsally, pits deeper posteriorly; mesogastric and cardiac regions laterally defined by grooves, cardiac groove markedly deeper. Fronto-orbital width distinctly more than half of maximal width of carapace; frontal margin divided by distinct V-shaped median notch; frontal margin dense, coarsely granular; just behind frontal margin secondary transversal row of coarse granules; transverse groove with row of setae extending across between frontal margin and secondary row of granules; frontal area behind secondary row of granules pitted. Supraorbital margin interrupted by 2 notches, lined with distinct granules, granulation coarsest in lateral half, continued to outer orbital (first anterolateral) tooth; suborbital margin lined with coarse granules, mesially with broad, squarish lobe directed toward front. Anterolateral margin strongly convex, projecting in 4 distinctly granular teeth, decreasing successively in size posteriorly; first (outer orbital) and second teeth completely fused together into single, broad lobe; third tooth apparent as broad lobe separated from both teeth 1+2 and tooth 4 by incipient notch only; teeth 4 and 5 well distinct from each other; fourth broadly triangular, directed anteriorly with arched lateral margins; fifth smallest, directed outwards, rather acute. Posterolateral margins well defined, rather straight behind last anterolateral tooth. Limit between epistome and endostome well defined, forming pronounced, sinuous lip, interrupted by 3 shallow notches, one at each side of mesial notch. Ocular peduncle distinctly flattened dorsally, anterior border granular, freely movable, thick, constricted subdistally, fully retractable into orbital cavity; cornea small, brownish ommatidia well recognizable. Antennules prominent; basal article thickest laterally, with row of transverse granules; second article smooth, elongated, subcylindrical, articulated to basal article at mesial end of antennular fossa; third article nearly equal in length to second, swollen distally, tapered to proximal articulation with second article, terminally with long marginal setae at either side of dorsal flagellum on dorsal side. Antennal article 2+3 immovable, filling orbital gap; articles 4 and 5 freely movable, subcylindrical. Thoracic sternum smooth, scarcely punctate, pits inconspicuous; sterno-abdominal cavity minutely granular anteriorly, lateral margins lined with strong granules. Abdominal locking system functional, thoracic sternal button placed next to thoracic sternal suture 5/6. Third maxillipeds widely separated from each other; ischium with marked longitudinal furrow, scattered granules near mesial margin; merus distinctly shorter than ischium, evenly granular. Chelipeds weakly heterochelous. Merus of major P1 trigonal, dorsal margin with ridge of strong granules ending in strong subdistal spine, ventrolateral margin granular, granules stronger anteriorly. Carpus with strong spine on inner margin, mesial margin granular, dorsal surface evenly coarsely granular. Propodus stout, dorsal margin with row of small granules extending across longitudinally; ventral margin with row of coarse granules extending across longitudinally; lateral surface with coarsely granular posteriorly, otherwise microscopic granules evenly distributed. Fingers gaping proximally; cutting edges bluntly dentate proximally, teeth becoming coalescent anteriorly; fingers pinkish throughout length. Ambulatory legs (P2–P5) long, slender, relative lengths P4>P3>P2>P5. P2, P5 meri each with row of scattered, minute granules dorsally. Carpi and propodi of P2–P4 with rows of dorsal setae, scattered pitted. Dactyls of P2–P5 depressed each with corneous tip, 5 longitudinal rows of long setae, 2 dorsal, 1 ventral, 2 lateral. Abdomen of 4 segments and telson; segments 3–5 fused together; abdominal suture 3/4 distinct, suture 4/5 faint; segment 1 much broader than segment 2 (female abdomen of 6 segments and telson).

Remarks. Rathbun (1918) selected a male (USNM 17461) to serve as the name-bearing type of Speocarcinus granulimanus Rathbun, 1894 , although incorrectly referring to it as the holotype. As discussed by Brandão et al. (2010) Rathbun’s procedure actually constitutes a valid lectotype designation. The lectotype of S. granulimanus is first described herein.

Distribution. From the Gulf of California south to the Pacific coast of Panama, 9 to 60 m.

Figures

FIGURE 2. A – B, Lateral view of right and left chelipeds, respectively. C – H, Habitus, dorsal view. A, C, Speocarcinus amazonicus Brandão, Tavares & Coelho-Filho, 2010, holotype male cl 8 mm, cw 11 mm (MZUSP 23654). B, D, Speocarcinus granulimanus Rathbun, 1894, lectotype male cl 17.5 mm, cw 21 mm (USNM 17461). E, Speocarcinus lobatus Guinot, 1969, holotype male cl 16 mm, cw 12 mm (USNM 101081). F, Speocarcinus meloi D’Incao & Silva, 1991, holotype male cl 12 mm, cw 15.6 mm (MZUSP 9577). G, Speocarcinus monotuberculatus Felder & Rabalais, 1986, holotype female cl 6 mm, cw 7.8 mm (USNM 228459). H, Speocarcinus spinicarpus Guinot, 1969, male holotype cl 16 mm, cw 19 mm (USNM 231701). Note the differences in the chelipeds inner carpal spines. Scale bars: C – F, H, 10 mm; G, 2.5 mm.