Ptychophallus montanus Rathbun 1898
Creators: name: Magalhães, Célio
name: Wehrtmann, Ingo S.
name: Lara, Luis Rólier
name: Mantelatto, Fernando L.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pseudothelphusidae
Ptychophallus
Ptychophallus montanus

description: Ptychophallus montanus (Rathbun, 1898)
(Figs. 35–38, 79)
Pseudothelphusa montana Rathbun, 1898: 516, 535, figs. 5, 6.— Young 1900: 14.— Rathbun 1904: 242 (in list).— Rathbun 1905: 286.— Rathbun 1906: 501 (in list).— Coifmann 1939: 108 (in list).— Ng. et al. 2008: 176.
Pseudothelphusa convexa Rathbun, 1898: 525, fig. 16.— Young 1900: 218.— Rathbun 1904: 242 (in list).— Rathbun 1905: 307.— Coifmann 1939: 107 (in list).
Pseudothelphusa (Ptychophallus) montana — Smalley 1964b: 10, figs. 9, 10.
Ptychophallus (Ptychophallus) montanus — Pretzmann 1965: 5.
Ptychophallus (Ptychophallus) montanus montanus — Pretzmann 1971: 20.— Pretzmann 1972: 85, figs. 511–513.
Ptychophallus (Ptychophallus) montanus convexus — Pretzmann 1971: 20.— Pretzmann 1972: 86, figs. 502–504, 532, 533.
Ptychophallus montanus — Rodriguez 1982: 85.— Hobbs, 1994: 101.— Campos & Lemaitre 1999: 560 (map).— Rodríguez & Hedström 2000: 423, 424, fig. 2B, G.— Ng et al. 2008: 176 (in list).— Villalobos Hiriart & Álvarez 2008: 296 (in list).
Fredius convexa — Ng et al. 2008: 174 (in list).
Material examined. COSTA RICA. Alajuela Province, Atlantic drainage: 1 male, 2 ovigerous females, UCR-MZ 3124-01, Macadamia Creek, 10°17’02.033”S 84°30’54.932”W, 23.i.2013, L.R. Lara; 1 male, INPA 2085, same data; 1 male, CCDB 4540, same data; 1 male, UCR-MZ 3126-01, creek tributary of Balsa River, 10°16'51.618"N 84°29'08.825"W, 7.x.2010, L.R. Lara leg.; 1 male, 1 female, UCR-MZ 3126-02, creek tributary of Balsa River, 10°16'49.526"N 84°30'52.29"W, 7.x.2010, L.R. Lara leg.; 1 male, INPA 2086, same data; 1 male, CCDB 4536, same data; 3 males, 1 female, UCR-MZ 3127-02, spring of Santa Rita, 10°16'07.36"N 84°30'43.8"W, 22.i.2013, L.R. Lara leg.; 3 males, 1 female, INPA 2084, same data; 2 males, 1 female, CCDB 4546, same data.—Alajuela Province, Pacific drainage: 1 male (cw 25.3, cl 14.8), UREG, Zapotal, San Antonio, Maquina Creek (tributary of Barrancas River), 10°09.087’N 84°36.851’W, xii.2009, T. Poettinger leg.; 1 male (cw 18.4, cl 11.4), UREG, Valvera Creek (tributary of Barranca River), near Zapotal, 10°09,487’N 84°38.954’W, 1157 m, xii.2009, T. Poettinger leg.; 1 male (cw 29.6, cl 11.7), UREG, Valvera Creek (tributary of Barranca River), near Zapotal, 10°09.657’N 84°38.708’W, xii.2009, T. Poettinger leg.; 1 male (cw 20.7, cl 12.2), UREG, Palmital Creek (tributary of Barranca River), near San Antonio (near Zapotal), 10°09.521’N 84°36.992’W, xii.2009, T. Poettinger leg.; 1 male (cw 26.0, cl 14.9), UREG, Palmital Creek (tributary of Barranca River), near San Antonio (near Zapotal), 10°08.880’N 84°36.871’W, xii.2009, T. Poettinger leg.; 1 male, UCR-MZ, near Zapotal, 10°09.481'N 84°38.154'W, date unknown, T. Poettinger leg.; 1 male, UCR-MZ, near Zapotal, 10°08.880'N 84°36.877'W, date unknown, T. Poettinger leg.; 1 male, UCR-MZ, near Zapotal, 10°09.175'N 84°37.186'W, date unknown, T. Poettinger leg.; 1 male, UCR-MZ, near Zapotal, 10°09.675'N 84°38.709'W, date unknown, T. Poettinger leg.; 1 male, UCR-MZ, near Zapotal, 10°09.511'N 84°36.992'W, date unknown, T. Poettinger leg.; 1 male, UCR-MZ, near Zapotal, 10°09.087'N 84°36.857'W, date unknown, T. Poettinger leg.; 1 male, UCR-MZ, Valverde Creek, near Zapotal, 10°09.670'N 84°38.795'W, 1033 m, T. Poettinger & N. Thiercelin leg.—Heredia Province, Atlantic drainage: 3 males, 3 females, UCR-MZ 178, Vara Blanca, 7.v.1967, leg. D.C. Robinson et al.; 1 male, UCR-MZ 170, Vara Blanca, 27.viii.1967, D.C. Robinson leg.—Heredia Province, Pacific drainage: 3 males, 2 females, 2 juv. females, UCR-MZ 733, San José de La Montaña, Porroz River, 3.xi.1971, C. Villalobos & R.A. Cruz leg.—Cartago Province, Atlantic drainage: 2 males, 5 females, USNM 32257, Cachí, Reventazón River, xii.1902, P. Biolley leg.; 2 males, 6 females, UCR-MZ 652, reservoir of Cachí, 15.x.1972, C.E. & C. Villalobos leg.; 1 male, INPA 1843, same data; 4 males, INPA 2019, Turrialba, road Vargas in Santa Cruz de Turrialba, 24.xii.2013, D. Hernández leg.; 1 male, UCR-MZ 3227-01, Buena Vista, Pacayas, Alvarado Canton, 9°55'43.44"N 83°47'36.6"W, 1750 m, 9.xi.2013, D. Hernández leg.—San José Province, Atlantic drainage: 1 male, UCR-MZ 718, Vásquez de Coronado Canton, Claro River, Bajo de La Hondura, 29.iv.1972, R.A. Cruz & C. Villalobos leg.—San José Province, Pacific drainage: 3 males (cw 28.8, cl 17.8; cw 31.8, cl 18.9; cw 38.0, cl 23.8) 1 immat. female (cw 20.0, cl 12.8), UCR-MZ 171, San Isidro de Coronado, 3.ii.1968, col. unknown; 1 male lectotype, 1 male paralectoptype, 2 females paralectotypes, USNM 19486, La Palma, 1500 m, ii.1896, G.F. Tristan leg.; 1 male, 5 females, TMNH 4442, Grande de Tárcoles River, 0.2 mi S Alto La Palma, 4.4 mi N San Jerónimo, Moravia Canton, 9.vii.1962, A.E. & G. Smalley leg.— Puntarenas Province, Pacific drainage: 1 male (cw 39.3, cl 24.9), holotype of Pseudothelphusa convexa Rathbun, 1898, USNM 19483, Palmar, undated, G.K. Chemie leg.
PANAMA. Chiriquí Province, Pacific drainage: 4 males, 5 females, USNM 1089227, vicinities La Concepción, vi.1964, local children leg.
Description of gonopod. Straight in mesiocaudal view. Marginal suture on mesial side, straight; marginal process rounded to subtriangular, not produced beyond distal border of apex. Mesial process subtriangular, slightly downturned. Lateral process moderately long, approximately 70–75% of stem length (from proximal opening to caudal border of apex), strongly bilobed, with distinct median concavity on caudal surface; lateral border with distinct median incision; proximal lobe rather angled, usually as wide as or sometimes wider than distal lobe, with few to several scattered minute setae on caudal, lateral surfaces; distal lobe broad, usually transversal, moderately swollen distally on cephalic surface, narrower or usually as wide as lateral end of apex. Distocaudal ridge distinct, narrow, well separated from distal border of lateral process by distinct depression. Apex bent approximately 90° towards laterocephalic side; oblong, narrow in distal view; caudal border with narrow notch near lateral end. Field of apical spines well developed, facing towards cephalolateral side.
Lectotype and type locality. Male, cw 25.5, cl 15.1, USNM 19486. Costa Rica, San José, La Palma (Alto La Palma, 10°03’N 83°58’W, according to Smalley, 1964b) (Pacific drainage). Rathbun (1898) based the description of Pseudothelphusa montana on two males and two females. The smaller male is designated here as lectotype. Both gonopods were dissected and probably was the specimen used by Rathbun (1898: 516, fig. 6b, c) and Smalley (1964b: 12, figs. 9, 10) to illustrate the G1. The larger male (27.3:15.4) and the females (32.5:18.2; 33.2:18.8) are paralectotypes.
Distribution. Central and southeastern Costa Rica, in both Atlantic and Pacific drainages, and western Panama, Pacific drainage (Fig. 79).
Remarks. Rathbun (1898) mentioned that the G1 of P. tumimanus, although resembling that of P. montanus, had less thickened distal lobe and the proximal lobe less angular than in the latter species. Rathbun (1898) also distinguished them by the presence of a large protuberance on the palm between the fingers in P. tumimanus. In the keys provided by Rathbun both species are differentiated by the morphology of the lobes of the lateral process. Pretzmann (1972) considered P. tumimanus having a lateral process bearing a thick section in contrast to a slim section in P. montanus. For Smalley (1964b) and Rodriguez (1982) P. montanus has a marginal process nearly as long as distal border of apex and a subacute proximal lobe in contrast to a marginal process much shorter and a proximal lobe broadly rounded in P. tumimanus. Smalley (1964b) also distinguished them by size: small (P. montanus) or large (P. tumimanus) species. These diagnostic characters are indeed subject to some degree of variation in our material, particularly the size and shape of the lateral process of the G1 (see Figs. 35, 37, 38). The cheliped protuberance and the size are also poor characters because some large specimens can have gonopods with subacute proximal border of the lateral process and bear a protuberance in the palm (e.g., UCR-MZ 170, 171).
Such variability as well as the largely sympatric distribution of both species would suggest that they could be synonymized. We nevertheless prefer to keep them separate for the time being until genetic studies are undertaken. Pseudothelphusa convexa Rathbun, 1898 was already synonymized by Rodriguez (1982) under Ptychophallus montanus (Rathbun, 1898).
description: Published as part of 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), pp. 301-344 in Zootaxa 3905 (3) on pages 314-317, DOI: 10.5281/zenodo.235127