Spirothelphusa verticalis (Rathbun, 1893)

(Fig. 7)

Pseudothelphusa verticalis Rathbun, 1893: 652, plate LXXIV, figs. 8, 9.

Potamocarcinus verticalis Ortmann, 1897: 317 .

Pseudothelphusa verticalis Rathbun, 1898: 510 (key), 513, 536–537 (list).— Young, 1900: 213.— Rathbun, 1905: 274 (key), 285, 286.— Coifmann, 1939: 109 (list).

Strengeria (Spirothelphusa) verticalis Pretzmann, 1965: 8 [part].

Pseudothelphusa (Ptychophallus) verticalis — Bott 1968: 42 [part].

Spirothelphusa verticalis — Smalley 1970: 103 (list), 105 (key).

Pseudothelphusa (Spirothelphusa) verticalis — Pretzmann 1971: 22.

Spirothelphusa verticalis — Rodríguez & Smalley 1972: 74, 75.— Pretzmann 1972: 108- 109.— Rodriguez 1982: 89–90.— Villalobos-Figueroa 1982: 220 (list).— Villalobos-Hiriart 2005: 22, 23 (tabla 2), 24, 27 (tabla 4), 40, 51, 59, 60, 86, 360 (apéndice 1).— Villalobos-Hiriart et al. 1993: 286 (list).—Villalobos Hiriart & Álvarez 2008: 248 (tabla 1), 251, 297 (list).— Ng et al. 2008: 177 (list).— Villalobos & Alvarez 2010: 461, 467 (table 2), 468 (fig. 5), 471 (fig. 8), 473 (fig. 9).— Alvarez & Villalobos 2016: 254 (table 8.1).— Ojeda-Escoto 2017: 27, 38, 43, 64, 88 (apéndice 1), 95 (apéndice 3).— Villalobos-Hiriart et al. 2019: 156 (table 1).— Álvarez et al. 2020: 5 (table 1), 10 (fig. 1), 13 (fig. 2), 23–24 (key), supplementary material (table 1).

Material examined. Male cl 20.7 mm, cw 33.2 mm (CNCR 25444), La Venta river, El Aguacero cascade (16°47’26.00”N, 93°29’ 20.00”W) (850 m asl), Biosphere Reserve Selva El Ocote, Municipality of Ocozocuautla de Espinoza, Chiapas, Mexico, coll. E. Moreno, K. Zárate & M. Casella, 20 August 2008; 2 males cl 18.1–21.3 mm, cw 30.0–33.5 mm, 2 females, cl 23.0–29.9 mm, cw 36.4–46.1 mm (CNCR 28900), Los Bordos Cave (16°49’38.08”N, 93°31’35.06”W) (643 m asl), near of the Biosphere Reserve Selva El Ocote, Municipality of Ocozocoautla de Espinosa, Chiapas, Mexico, coll. K. Zárate, 28 April 2013 ; 3 males cl 17.3–25.5 mm, cw 21.3–41.4 mm, 1 female, cl 23.6 mm, cw 37.7 mm (CNCR 31677), El Encanto Cave (16°47’26.00”N, 93°29’20.00”W) (748 m asl), Los Bordos Cave (16°49’38.08 N, 93°31’35.06” W) (643 m asl), near of the Biosphere Reserve Selva El Ocote, Municipality of Ocozocoautla de Espinosa, Chiapas, Mexico, coll. K. Zárate, O.R. Sánchez, 14–17 April 2014; 7 males cl 10.7–26.8 mm, cw 17.1–44.7 mm, 1 female, cl 23.3 mm, cw 37.2 mm (CNCR 35575), El Encanto Cave (16°47’26.00”N, 93°29’20.00”W) (748 m asl), Ecotourism Center El Aguacero Cascade, Municipality of Ocozocoautla de Espinoza, Chiapas, Mexico, coll. E. Moreno, K. Zárate & M. Casella, 16 March 2020 ; 4 males cl 16.1–26.1 mm, cw 23.7–41.2 mm (CNCR 36532), Los Bordos Cave (16°49’38.08 N, 93°31’35.06” W) (643 m asl), near of the Biosphere Reserve Selva El Ocote, Municipality of Ocozocoautla de Espinosa, Chiapas, Mexico, coll. J. Arroyave, M. Buenavad, D. Torres, J. López & K. Zárate, 20 March 2022 ; 1 male cl 22.4 mm, cw 37.9 mm, 2 females cl 19.7–25.7 mm, cw 31–41.9 mm (CNCR 37054), Colonia Tierra y Libertad, Municipality of Juquipilas (16°40’08.34 N, 93°38’52.47” W) (530 m asl), coll. C. Chávez, 2 November 1998 .

Remarks. An important result derived from the present integrative molecular and multigene analysis is the new position of Spirothelphusa verticalis, previously included in the subfamily Raddausinae (Álvarez et al. 2020), and now recovered in the subfamily Pseudothelphusinae . The complex morphological pattern of the apical elements of the G1 thus far prevented a satisfactory classification of the species. A more detailed morphological revision showed the presence of a unique caudo-marginal projection. The fusion of the marginal plate and the caudal surface forming a twisted distal and laminate, oval apical lobe, which is bordered with small spines and turned around the cephalic surface of the final third of principal axis. This result, based on molecular evidence, improve the current classification of the Pseudothelphusinae .