Tehuana complanata (Rathbun, 1905)

Moreno-Juarez, Eric G., Villalobos, Jose Luis & Alvarez, Fernando, 2022, Revision of the freshwater crabs of the genus Tehuana Rodriguez & Smalley in Smalley 1970 (Decapoda, Pseudothelphusidae), with the descriptions of two new species, ZooKeys 1117, pp. 1-35 : 1

Tehuana complanata (Rathbun, 1905)

Figs 8D , 9D

? Pseudothelphusa bocourti .-Rathbun, 1898: 512 (in key), 513, 533 (list) [not Boscia bocourti A. Milne-Edwards, 1866].

Pseudothelphusa complanata Rathbun, 1905: 303, fig. 3.- Coifmann 1939: 107 (list).

"Pseudothelphusa" complanata .-Pretzmann, 1965: 10 (list).

Pseudothelphusa Pseudothelphusa ( Pseudothelphusa ) Pseudothelphusa lamellifrons gruneri .-Pretzmann, 1968: 7.- Pretzmann 1971: 22 (list).

Pseudothelphusa (Pseudothelphusa) americana lamellifrons .-Bott, 1970: 334, pl. 2, figs 11-13.

Potamocarcinus (Raddaus) bocourti complanata .-Pretzmann, 1971: 20.(list).

Potamocarcinus (Raddaus) bocourti complanatus .-Pretzmann, 1972: 78, text fig. 18, fig. 542.

Pseudothelphusa Pseudothelphusa (Tehuana) lamellifrons gruneri .-Pretzmann, 1972: 108, figs 621-623, 674-677.

Pseudothelphusa (Tehuana) cordobensis Rodríguez & Smalley, 1972: 77, fig. 8, pl. 5.

Pseudothelphusa (Tehuana) complanata Türkay, 1978: 145, figs 2a, b, 3.

Tehuana complanata Rodriguez, 1982: 131, fig. 85.- Villalobos 1982: 221 (list).- Villalobos-Hiriart et al. 1993: 284 (list).- Alvarez and Villalobos 1994: 730.- Álvarez et al. 1999: 20, fig. 3 (map), 23, box 3 (list).-Villalobos and Alvarez 2003: 2003 (in key).- Villalobos Hiriart and Álvarez 2008: 280, 298 (list).- Ng et al. 2008: 177 (list).-Villalobos and Alvarez 2010: 474, 477, fig. 11 (map).- Álvarez et al. 2011a: appx. VIII.20, p. 13 (list).- Mejía-Ortíz et al. 2011: 97, 136 (map 2).- Álvarez et al. 2012: 1078, box 1 (list).- Cumberlidge et al. 2014: 144, tab. 3 (list).- Alvarez and Villalobos 2016: 254, tab.8.1 (list).- Villalobos-Hiriart et al. 2019: 156, tab.1 (list).

Material examined.

Mexico - Veracruz • 1 ♂, holotype of Pseudothelphusa (Tehuana) cordobensis Rodríguez and Smalley (1972); LC 38.2 mm, AC 59.0 mm; Municipality of Córdoba Ojo de Agua, Paraje Nuevo , 18°52'35"N, 96°51'49"W; alt. 661 m; 2 May 1953; A. Villalobos leg.; CNCR 311 . 1 ♂; LC 30.0 mm, AC 45.4 mm; Municipality of Amatlán de Los Reyes, Lourdes River Cave ; 18°47'00"N, 96°54'00"W; alt. 439 m; 13 Jun. 1996; J. Herrera, E. Ramírez leg.; CNCR 11958 . 3 ♂, 3 ♀; LC 15.4-27.9 mm, AC 22.9-42.7 mm; Municipality of Amatlán de Los Reyes, Amatlán II Power Station ; 18°51'23"N, 96°54'19"W; alt. 730 m; 6 Jun. 1992; J. Herrera, E. Ramírez leg.; CNCR 11957 . 1 ♀, LC 26.2 mm, AC 18.9 mm; Motzorongo, Municipality of Tezonapa, Motzorongo River ; 18°38'30"N, 96°43'53"W; alt. 271 m; C. Pedraza, L. García leg.; CNCR 34618 .

Diagnosis.

G1, in cephalic view, with three protuberances on lateral surface, proximal one being the most developed. In mesial view, meso-distal lobe conical, with round and slender apex. In caudal view, median constriction forming a large lobe oriented proximally. Caudo-marginal projection with distal lobes separated by linear notch without leaving space in between. Distal lobe with rounded cephalic edge, shorter than proximal lobe. Proximal lobe ax-shaped, higher than distal (1.5 ×); cephalic border circular, caudal border straight; distal crest slightly laterally oriented, lobe with sloping appearance. Internal carina well marked, circular, its length covering at least ⅓ of internal surface. Mesial process reduced, in transversal position, without lateral spine; distal edge oriented cephalad. Internal angle developed in form of lobe, two-thirds as high as mesial process, wide, touching the internal surface of distal lobe (DL) of CMP. In distal view, mesial process concave, internal angle hidden below the proximal lobe (PL) of caudo-marginal projection.

Distribution.

Tehuana complanata is distributed around the city of Cordoba, Veracruz, Mexico (Fig. 1 ).

Remarks.

The recognition of the type locality of Tehuana complanata has been problematic since Rathbun (1905) cited "Coban, Alta Vera Paz, Guatemala" as the type locality of Pseudothelphusa complanata. Later, Rodríguez and Smalley (1972) described Pseudothelphusa (Tehuana) cordobensis from "Paraje Nuevo, Córdoba, Veracruz" which fits the description of T. complanata . Türkay (1978) discussed this situation concluding that it was a labelling error by Bocourt who placed crabs from Veracruz, Mexico in a jar with specimens from Coban, Guatemala. Rodriguez (1982) synonymized P. (T.) cordobensis under T. complanata and designated the male from "Paraje Nuevo, Córdoba, Veracruz" (CNCR 311) as the holotype.

Morphologically, the G1 of T. complanata is similar to that of T. jacatepecensis ; both species have a broadly rounded to semicircular proximal lobe of the CMP, although in the former the distal and proximal lobes are subequal in length, whereas in the latter the proximal lobe is clearly shorter (Fig. 8D ). Tehuana complanata is also similar to T. lamellifrons even when they are geographically distant within the genus range (Fig. 1 ); however, in the obtained phylogeny they appear as sister species (Fig. 3 ).

Figures

Figure 1. Distribution of the species of the genus Tehuana in southeastern Mexico.

Figure 3. Phylogenetic tree obtained for the genus Tehuana based on the concatenated analysis of three genes (H 3, 16 S, COI), using maximum likelihood and Bayesian inference. Branch supports values are posterior probability / bootstrap. Only clades with branch support above 50 % indicated. Clades a, b, and c are labelled for discussion purposes.

Figure 8. Mesial view of the apical portion of the G 1 of the species of Tehuana A T. ayotzintepecensis sp. nov., CNCR 34628 B T. chontalpaensis, CNCR 17093 C T. col sp. nov., CNCR 33928 D T. complanata, CNCR 11957 E T. diabolis, CNCR 12056 F T. lamellifrons, CNCR 33939 G T. lamothei, CNCR 8812 H T. jacatepecensis, CNCR 11920 I T. poglayenorum, CNCR 33931 J T. veracruzana, CNCR 33934. Scale bars: 1 mm.

Figure 9. Cephalic view of the apical portion of the G 1 of the species of Tehuana A T. ayotzintepecensis sp. nov., CNCR 34628 B T. chontalpaensis, CNCR 17093 C T. col sp. nov., CNCR 33928 D T. complanata, CNCR 11957 E T. diabolis, CNCR 12056 F T. lamellifrons, CNCR 33939 G T. lamothei, CNCR 8812 H T. jacatepecensis, CNCR 11920 I T. poglayenorum, CNCR 33931 J T. veracruzana, CNCR 33934. Scale bars: 1 mm (A, C, H, J); 0.5 mm (B, D, E, F, G, I).