Allacanthos yawi Magalhães, Lara & Wehrtmann, 2010

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 : 328-329

Allacanthos yawi Magalhães, Lara & Wehrtmann, 2010

( Figs. 69, 70 , 85 )

Allacanthos yawi Magalhães, Lara & Wehrtmann, 2010 : 53, figs. 1, 2.— Lara et al. 2013: 689 (table), 691, fig. 4 (map).

Material examined. COSTA RICA. Puntarenas Province, Pacific drainage: male, holotype, UCR-MZ 2399, Buenos Aires county, Grande de Térraba River Basin, unnamed creek, tributary of Cañas River, near Santa María, 9°16’55.37”N 83°22’14.66”W, 1360 m, 11.xi.2009, L.R. Lara leg.; 2 males, paratypes, INPA 1830, Buenos Aires county, Grande de Térraba River basin, unnamed creek, tributary of Cañas River, near Santa Rosa, 9°15’01.32”N 83°23’17.28”W, 980 m, 26.xi.2009, L.R. Lara leg.; 1 male, paratype, MZUSP 22168, Buenos Aires county, Grande de Térraba River basin, creek unnamed, tributary of Cañas River, near Santa Rosa, 9°15’01.32”N 83°23’17.28”W, 980 m, 26.xi.2009, L.R. Lara leg.; 2 males, 2 females, paratypes, UCR-MZ 2402, tributary of Cañas River, near Santa Rosa, 9°15’01.32”N 83°23’17.28”W, 12.iv.2010, L.R. Lara; 1 male, paratype, UCR-MZ 723-01, creek Cacao, 43 km E de San Isidro, 9°13’N 83°28’W, approx. 505 m, 5.xii.1971, V. Juárez leg.

Description of gonopod (modified from Magalhães et al. 2010). Straight in both caudal, lateral views, with proximal protuberance on lateral side; distal part flattened mesiolaterally, distinctly bent in cephalic direction; spermatic channel opening on cephalic side. Marginal suture situated on mesial side, straight along most of stem, curved to cephalic side distally in mesial view, with row of marginal setae proximally. Proximal portion of mesiocaudal side with short row of setae. Subdistal portion of lateral, cephalic sides with a very weakly developed field of scattered minute spines. Marginal process (apical lobe sensu Smalley, 1964b) simple, narrow, distal border nearly straight. Lateral suture incomplete, marked by a rather deep sulcus on the proximal half of the caudal side. Distal portion of mesial border produced into a large, slightly concave mesial lobe. Apex with a narrow lateral lobe bearing a very weakly developed field of apical spines on its internal surface, a central papilla partially bordering the spermatic channel opening,, a minute subtriangular, sharp tip. G2 slender, thinner along distal quarter, nearly as long as G1.

Holotype and type locality. Male, cw 25.5, cl 15.7, UCR-MZ 2399. Costa Rica, Puntarenas Province, Buenos Aires County, Grande de Térraba River basin, unnamed tributary of Cañas River, near Santa María (Pacific drainage).

Distribution. The species is currently known from the Volcán River basin, which empties into the left bank of General River, in the Grande de Térraba River basin, Pacific drainage ( Fig. 85 ).

Figures

FIGURE 85. Distribution map of Allacanthos pittieri (Rathbun, 1898) and A. yawi Magalhães, Lara & Wehrtmann, 2010.

FIGURES 61 – 70. Ptychophallus uncinatus Campos & Lemaitre, 1999: 61, left first gonopod, holotype, USNM 276164, caudo-mesial view; 62, same data, latero-cephalic view of distal part; 63, left first gonopod, holotype of Ptychophallus barbillaensis Rodríguez & Hedström, 2000, UCR-MZ 2351 - 01, caudo-mesial view. Allacanthos pittieri (Rathbun, 1898): 64, right first gonopod, holotype, USNM 21243, caudo-mesial view; 65, left first gonopod, NHMW 4016, caudo-mesial view; 66, same data, lateral view; 67, same data, cephalic view of distal part; 68, same data, apical-cephalic view of distal part. Allacanthos yawi Magalhães, Lara & Wehrtmann, 2010: 69, left first gonopod, holotype, UCR-MZ 2774 - 01, caudo-mesial view; 70, same data, latero-cephalic view (cl, cephalic lobe; fas, field of apical spines; lb, lateral lobe; mp, marginal process; ss, subdistal field of spines; tl, trianguliform lobe). Scale bars = 1 mm.