Ptychophallus colombianus ( Rathbun, 1896 )

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 : 307-309

Ptychophallus colombianus ( Rathbun, 1896) , species inquirenda

( Figs. 10–14 , 79 )

Pseudothelphusa colombiana Rathbun, 1893: 653 , pl. 74, fig. 10; pl. 75, fig. 1.— Rathbun 1898: 511, 513, 533.— Young 1900: 219.— Rathbun 1904: 242 (in list).— Rathbun 1905: 302.— Coifmann 1939: 107 (in list).— Smalley 1964b: 10.

Potamocarcinus colombianus — Ortmann 1897: 317.

Ptychophallus (Ptychophallus) columbianus [sic]— Pretzmann 1965: 5.

Ptychophallus (Semiptychophallus) columbianus [sic]— Pretzmann 1971: 21.

Ptychophallus (Semiptychophallus) colombianus .— Pretzmann 1972: 88, figs. 514, 515, 525, 526.

Ptychophallus (Semiptychophallus) colombianus .— Pretzmann 1980: 653.

Ptychophallus colombianus — Rodriguez 1982: 83.— Villalobos 1982: 220 (in list).— Rodríguez 1994: 302, fig. 3A–C.— Campos & Lemaitre 1999: 560 (map).— Rodríguez & Hedström 2000: 423.— Ng et al. 2008: 176 (in list).— Villalobos Hiriart & Álvarez 2008: 297 (in list).— Lara et al. 2013: 689 (table), 691, fig. 4 (map).

Ptychophallus (Ptychophallus) exilipes— Pretzmann 1980: 651.

Material examined. COSTA RICA. San José Province, Pacific drainage: 1 immat. male, 1 female, SMF, Pérez Zeledón Canton, Páramo District, road from División to Santa Eduviges, 09°29’32"N 83°44’33"W, 1860 m, 13.ii.2007, G. Köhler leg.; 1 male, 1 female, UCR-MZ 2757-01, Pérez Zeledón Canton, unnamed creek, tributary Buena Vista River, drainage of Grande de Térraba River, 09°28’9.33”N 83°39’24.53”W, 1200 m, 13.vi.2007, L.R. Lara leg.; 1 male, 1 female, INPA 1654, same data locality and date, L.R. Lara leg.; 1 left G1, INPA 1659, same data locality and date; 2 males, 1 female, INPA 1845, same data locality and date, L.R. Lara leg.; 4 males, INPA 1831, same data locality, 26.x.2009, L.R. Lara leg.— Puntarenas Province, Pacific drainage: 2 males, 2 females, NHMW 4014, San Vito, trib. stream of Aguabuena River, 13–14.ii.1975, I. Poglayen-Neuwall leg.; 2 males, 6 females, NHMW 4013, Caño Seco River, Aguabuena, 980 m, 12.ii.1975, I. Poglayen-Neuwall leg.

PANAMA. Chiriquí Province, Pacific drainage: 1 male, 1 immat. male, 1 immat. female, ZMB 4476, locality not specified, Standinger leg.; 3 males 1 female, NHMW 4001, creek near Bambito, 11.ii.1975, I. Poglayen- Neuwall leg.; 1 immat. male (soft shell, damaged), USNM 58182, Volcán, Chiriquí Viejo River, 1.iii.1924, Foster leg.; 1 male, 4 females, USNM 230098, Hato de Volcán, 18.vi.1960, M. & C. Robinson leg.; 1 male, 1 female, NHMW 4011, Cochea River, above Dolega, 280 m, 8.ii.1975, I. Poglayen-Neuwall leg.; 1 female (cw 49.9, cl 28.4), USNM 1256156, lectotype, David River, about 8°28’N 82°24’W, approximately 1200 m elevation; 1 female (cw 31.3, cl 19.2), paralectotype, USNM 5512, same data as lectotype.

Description of gonopod. Straight in mesiocaudal view, apex bent approximately 90° in laterocephalic direction. Marginal suture on mesial side, straight; marginal process short, angled, not produced beyond the distal border of apex. Mesial process small, subtriangular, slightly downturned. Lateral process long, approximately 70–80% of stem length (from proximal opening to caudal border of apex), usually slightly shorter than or as wide as lateral end of apex, with shallow depression around middle; lateral border nearly straight or slightly concave, distal lobe thicker distally. Distocaudal ridge short, narrow, well separated from distal border of lateral process by distinct depression. Apex oblong, narrow; caudal border straight or slightly convex, with small notch near lateral end. Field of apical spines well developed, facing towards cephalolateral side.

Lectotype and type locality. Female, cw 49.9, cl 28.4, USNM 1256156. Panama, Chiriquí Province, David River, about 8°28’N 82°24’W, approximately 1200 m elevation (Pacific drainage).

Distribution. Southern Costa Rica (San José and Puntarenas Provinces) and western Panama (Chiriquí Province), Pacific drainage ( Fig. 79 ).

Remarks. This species was described from two female syntypes ( Rathbun, 1893). Because the current classification of pseudothelphusid crabs is based on the G1 morphology ( Smalley, 1964a, b; Rodriguez, 1982), the validity of this species is questionable, particularly because new records presented in this paper show that other Ptychophallus species ( P. paraxantusi and P. montanus ) can also occur in the same region of its type locality in the Pacific drainage of western Panama. To avoid nomenclatural instability, we decided to recognize the present species based on Rodríguez remarks (1994: 302), but suggest that further morphological and molecular studies including large series of specimens from western Panama should be performed to clarify the taxonomic status of this species.

The G1 morphology of the present species resembles that of P. exilipes and P. lavallensis , particularly the very long lateral process. In P. colombianus , the lateral process has a subrectangular format and it is not wider than the lateral end of the apex, while it has a broadly subtriangular appearance and it is wider than the lateral end of apex in the other two species, a subtle difference that sometimes can be hardly noticed if the specimens are not fully grown males.

Figures

FIGURE 79. Distribution map of Ptychophallus colombianus (Rathbun, 1896), and P. montanus (Rathbun, 1898).

FIGURES 10 – 21. Ptychophallus colombianus (Rathbun 1896): 10, left first gonopod, INPA 1845, caudo-mesial view; 11, same data, latero-cephalic view of distal part; 12, outline of left first gonopod, INPA 1654, caudo-mesial view; 13, same data, INPA 1659; 14, same data, NHMW 4001. Ptychophallus costaricensis Villalobos, 1974: 15, right first gonopod, paratype, UCR-MZ 719, latero-cephalic view of distal part; 16, same data, caudo-mesial view. Ptychophallus goldmanni Pretzmann, 1965: 17, left first gonopod, holotype, USNM 54044, caudo-mesial view; 18, same data, cephalic-apical view of distal part; 19, same data, latero-cephalic view of distal part. Ptychophallus kuna Campos & Lemaitre, 1999: 20, left first gonopod, holotype, USNM 184340, latero-cephalic view of distal part; 21, same data, caudo-mesial view (dr, disto-caudal ridge; lp, lateral process; me, mesial process; mp, marginal process). Scale bars = 1 mm.