Tehuana lamellifrons (Rathbun, 1893)

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 lamellifrons (Rathbun, 1893)

Figs 8F , 9F

Pseudothelphusa lamellifrons Rathbun, 1893: 654, pl. 75, figs 2-5; 1898: 534, 537.- Young 1900: 221.- Rathbun 1905: 304.-Coiffman, 1939: 108.

Potamocarcinus lamellifrons .-Ortmann, 1897: 317 (key).

Pseudothelphusa (Pseudothelphusa) lamellifrons .-Pretzmann, 1965: 4.

Pseudothelphusa (Tehuana) lamellifrons lamellifrons .-Pretzmann, 1971: 22 (list).- Pretzmann 1972: 107, figs 612-614, 662-664.

Pseudothelphusa (Tehuana) lamellifrons .- Rodríguez & Smalley, 1972: 79, fig. 10.- Türkay 1978: 144.

Tehuana lamellifrons. -Rodriguez, 1982: 129, fig. 84.- Villalobos 1982: 220 (list).- Villalobos-Hiriart et al. 1993: 284 (list).- Alvarez and Villalobos 1994: 730.- Álvarez and Villalobos 1997a: 416, 417, fig. 4.17 (list).- Álvarez and Villalobos 1997b: 438, appx. 4.23 (list).- Álvarez et al. 1999: 20, fig. 3 (map).-Villalobos and Alvarez 2003: 228 (in key).- Villalobos Hiriart and Álvarez 2008: 282, 298 (list).- Ng et al. 2008: 177 (list).-Villalobos and Alvarez 2010: 475, 477, fig. 11 (map).- Guinot and Hendrickx 2014: 477.- Alvarez and Villalobos 2016: 254, tab. 8.1 (list).- Villalobos-Hiriart et al. 2019: 156, tab.1 (list).

Material examined.

Mexico - Oaxaca • 1 ♂, CL 50.4 mm, CW 80.6 mm; Municipality of Asunción Ixtaltepec, Nizanda, Cerro del Naranjo , Naranjo stream; 16°41'14.8"N, 95°02'09"W; alt. 293 m; 15 Apr. 1999; D. Barreto, V.H. Reynoso leg.; CNCR 16875 . 1 ♂, CL 31.2 mm, CW 43.4 mm; Municipality of Asunción Ixtaltepec, Naranjo stream; 16°41'24"N, 95°22'53"W; alt. 639 m; 15 Sep. 1997; V.H. Reynoso leg.; CNCR 18951 . 3 ♂, 2 ♀, CL 8.9-40.8 mm, CW 12.4-65 mm; Municipality of Asunción Ixtaltepec, Nizanda , stream; 16°39'30"N, 95°00'37"W; alt. 186 m; 26 Apr. 2017; J.L. Villalobos, I.A. Toledano, E. Moreno leg.; CNCR 33939 .

Diagnosis.

G1 slender, almost straight. Meso-distal lobe conical, in mesial view somewhat compressed caudo-cephalically. Mesial process in transversal position relative to G1 main axis, laying over proximal lobe of caudo-marginal projection, reduced, rounded, superior margin projected distally, without lateral tooth; in cephalic view internal angle triangular, pointing towards distal lobe of caudo-marginal projection (Figs 8F , 9F ). Lobes of CMP separated by long incision, lobes not gaping; in cephalic view proximal lobe oblique relative to main axis of gonopod, distal lobe slightly curved laterally. Distal lobe of caudo-marginal projection simple, rounded, projected cephalically; proximal lobe broadly rounded extending proximally, with internal semicircular carina. Apical cavity with elongated field of setae next to lateral margin; opening of spermatic channel in caudal position.

Type material.

The syntypes are deposited in the National Museum of Natural History, Smithsonian Institution, Washington, D.C. (USNM 3289).

Type locality.

Mexico, Oaxaca, Municipality of Santo Domingo Tehuantepec, Tehuantepec, Tehuantepec River; 16°18'60"N, 95°13'60"W; alt. 60 m (Rathbun, 1893).

Distribution.

Along the Pacific versant of the Isthmus of Tehuantepec, in the drainage systems of the Tehuantepec and Zanatepec rivers, in SW Oaxaca, Mexico (Fig. 1 ).

Remarks.

A new diagnosis for T. lamellifrons is here presented since those of Rathbun (1893) and Rodríguez and Smalley (1972) are too short omitting important characters of the G1. Other remarks see those for T. jacatepecensis .

Figures

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

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).