Potamocarcinus nicaraguensis Rathbun, 1893

Magalhães, Célio, Wehrtmann, Ingo S., Lara, Luis Rólier & Mantelatto, Fernando L., 2015, Taxonomy of the freshwater crabs of Costa Rica, with a revision of the genus Ptychophallus Smalley, 1964 (Crustacea: Decapoda: Pseudothelphusidae), Zootaxa 3905 (3), pp. 301-344 : 333-335

Potamocarcinus nicaraguensis Rathbun, 1893

( Figs. 73, 74 , 86 )

Potamocarcinus nicaraguensis Rathbun, 1893: 656 , pl. 76, 77, figs. 1–3.— Ortmann 1897: 317.— Rathbun 1898: 536,

537.— Young 1900: 222.— Rathbun 1904: 242 (in list).— Rathbun 1905: 310, pl.14, fig. 6.— Colosi 1920: 17.— Coifmann

1939: 110 (in list).— Smalley 1964b: 8.— Ng et al. 2008: 176 (in list).— Villalobos Hiriart & Álvarez 2008: 297 (in list). Potamocarcinus (Potamocarcinus) nicaraguensis — Pretzmann, 1965: 2.— Villalobos & Burgos 1975: 223, fig. 5. Potamocarcinus (Potamocarcinus) nicaraguensis nicaraguensis — Pretzmann 1971: 20.— Pretzmann 1972: 68.

Potamocarcinus (Megathelphusa) nicaraguensis — Pretzmann 1980: 653.

Material. COSTA RICA. Alajuela Province, Atlantic drainage: 1 male, INPA 1869, San Carlos Canton, San Carlos River, San Carlos estuary, 2.iii.2005, P. Gutierrez leg.; 3 males juv., UCR-MZ 771, San Carlos Canton, Danta creek, 9.iii.1973, C. Villalobos & E. Burgos leg.; 2 males, 1 female, 3 juv., UCR-MZ 772, San Carlos Canton, Habana creek, 9.iii.1974, C. Villalobos & E. Burgos leg.; 2 males, UCR-MZ 768, San Carlos Canton, Estero Hondo, 9.ii.1974, C. Villalobos & E. Burgos leg.; 3 males, 1 female, UCR-MZ 758, San Carlos Canton, Grande creek, 12.i.1974, C. Villalobos & E. Burgos leg.; 1 female juv., UCR-MZ, San Carlos Canton, Chachagua River, La Fortuna, 20.ix.2003, L.R.; 1 juv., UCR-MZ 764, San Carlos Canton, Burro River, 8.iii.1974, C. Villalobos & E.

Burgos leg.; 1 male, 3 females, 1 juv., UCR-MZ 763, San Carlos Canton, Chachagua River, 8.iii.1974, C. Villalobos & E. Burgos; 2 males, 1 female, UCR-MZ 767, San Carlos Canton, San Pedro Creek, C. Villalobos & E. Burgos; 1 juv., UCR-MZ 760, San Carlos Canton, Picueca Creek (trib. Peñas Blancas River), 8.iii.1974, C. Villalobos & E. Burgos leg.; 1 male, 2 females, UCR-MZ 762, San Carlos Canton, Azul creek, 8.ii.1974, C. Villalobos & E. Burgos leg.; 2 males, 2 females, UCR-MZ 769, San Carlos Canton, Azul creek, 8.ii.1974, C. Villalobos & E. Burgos leg.; 2 males, 5 females, UCR-MZ 760, San Carlos Canton, Los Chiles creek, 12.i.1974, C. Villalobos & E. Burgos leg.; 4 males, UCR-MZ 766, San Carlos Canton, La Balsa River, 9.ii.1974, C. Villalobos & E. Burgos leg.; 1 female, UCR-MZ 759, San Carlos Canton, Santa Rosa, 12.i.1974, C. Villalobos & E. Burgos leg.; 1 male, 1 female, UCR-MZ 770, San Carlos Canton, Chorros creek, 9.iii.1974, C. Villalobos & E. Burgos leg.; 2 males, 1 female, UCR-MZ 761, San Carlos Canton, Maquina creek, 8.ii.1974, C. Villalobos & E. Burgos leg.—Heredia Province, Atlantic drainage: 1 male, 1 female, UCR-MZ 1952, Sarapiquí River, Estación Biológica La Selva (OTS), 17.iii.1994, M. Spinola leg.; 1 m juv., NHMW 4020, Puerto Viejo River, near OTS Field Station, 28.ii.1975, I. Poglayen-Neuwall leg.

Description of gonopod. Thick, straight in both caudal, mesial views, moderately compressed mesio-laterally; caudal border concave in mesio-caudal view, smooth (no median tuft of setae), thicker on first third; mesio-caudal surface with elongated patch of short, long caudal setae along proximal half; mesio-cephalic surface with broadly rounded subdistal lobe bearing dense patch of setae. Spermatic channel opening on apex cavity, towards lateral end, between base of marginal process, mesial lobe. Marginal suture situated on mesial side, nearly straight along all stem, with row of marginal setae proximally. Marginal process (caudal process, sensu Smalley, 1964a) as apical triangular projection, distinctly longer than mesial lobe. Lateral suture incomplete, weakly marked by shallow sulcus on first two-thirds of caudal surface. Mesial process as flattened, blunt apical lobe directed cephalad on distal portion of mesial border. Apex twisted in latero-cephalic direction; mesial lobe reduced, short, not folded over apex cavity. Apex cavity rather broad; field of apical spines with fusiform patch of minute spines along caudocephalic direction. Cephalic process bifid, with 2 distinct spiniform teeth subapically on cephalic surface, distal tooth larger than proximal one.

Syntypes and type locality. Two males, 3 females (USNM 13788). Nicaragua, Río San Juan Province, near Graytown (formely San Juan del Norte, currently San Juan de Nicaragua) (Atlantic drainage).

Distribution. Northern Costa Rica, Atlantic drainage ( Fig. 86 ). Smalley (1964b) also recorded it in Costa Rica (from Trinidad, Heredia Province, and Resguardo, Guanacaste Province). The species is also found in Nicaragua ( Pretzmann 1980; Rodriguez 1982).

Figures

FIGURE 86. Distribution map of Potamocarcinus magnus (Rathbun, 1896), P. nicaraguensis Rathbun, 1893, and P. richmondi (Rathbun, 1893).

FIGURES 71 – 76. Potamocarcinus magnus (Rathbun, 1896): 71, left first gonopod, holotype, USNM 19049, caudal-mesial view; 72, same data, latero-cephalic view of distal part. Potamocarcinus nicaraguensis Rathbun, 1893: 73, left first gonopod, INPA 1869, caudal-mesial view; 74, same data, lateral view of distal part. Potamocarcinus richmondi (Rathbun, 1893): 75, left first gonopod, TMNH Acc. Nr. 94 - 100, caudal-mesial view; 76, same data, lateral view of distal part (ce, cephalic process; cp, caudal process; cst, caudal setae; fas, field of apical spines; ls, lateral suture; me, mesial process; mp, marginal process; ms, marginal suture). Scale bars: 71, 75 = 1 mm; 72 – 74, 76 = 2 mm.