Mexentypesa chiapas Raven, 1987

Salinas-Velasco, Héctor Vicente, Valdez-Mondragón, Alejandro & Villegas, Julián Bueno-, 2024, A new species of the spider genus Mexentypesa Raven (Araneae: Nemesiidae) from Hidalgo, Mexico and taxonomic comments on M. chiapas Raven, Zootaxa 5453 (2), pp. 233-244 : 241-243

Mexentypesa chiapas Raven, 1987

Figs. 28–44

Mexentypesa chiapas Raven, 1987: 358 , f. 1–9 (Description male and female).

= Aptostichus sabinae Valdez-Mondragón & Cortez-Roldán, 2016: 84 , f. 1–20 ( Description male and female), syn. n. Type material. MEXICO: Chiapas: 1♂ male holotype, 1♀ female paratype (AMNH), from Ocosingo (altitude 900 m; June 25, 1950, C. and N. Goodnight, L. J. Stannard Cols. (not examined).

Other material examined. MEXICO: Oaxaca: 1♂ male (CNAN-T1121) from Cueva Li Nita (lat 18.14767°, lon -96.79844°, 1919 m), Municipio Huautla de Jiménez , April 12, 2014, J. Mendoza, J. Cruz, S. Davlantes, M. Minkton Cols. (examined) .

Diagnosis. See comparative diagnosis of M. hidalguensis above.

Description. See Valdez-Mondragón and Cortez-Roldán (2016: figs 1–20) for a complete and detailed description of the male, and Raven (1987: fig. 8) for a complete description of the female.

Remarks. Based on the original description and illustrations by Valdez-Mondragón and Cortez-Roldán (2016: figs 1–20), the male holotype of Aptostichus sabinae Valdez-Mondragón & Cortez-Roldán, 2016 is identical to the male holotype and description by Raven (1987) of Mexentypesa chiapas Raven, 1987 . For this reason, we consider A. sabinae as a junior synonym of M. chiapas . Although Raven (1987) reports that the male holotype used in the description of the species had both embolus broken, the rest of the shape of the male palp, as well as the other body features, are the same (Robert Raven, pers. com.): a unique embolus, very long, slender, and sigmoidal, the palp tibiae with ventral and prolateral massive spines ( Figs 32–36 ) (broken in Raven 1987: fig. 4); the metatarsus I with a retrolateral-ventral small finger-shaped projection ( Figs 39–41 ), also described by Raven (1987: fig. 2); the tibiae and metatarsi III and IV have many ventral spines ( Fig. 42 ), as described by Raven (1987); similar body coloration as described by Raven (1987), with reddish brown coloration, even the abdomen dorsally brown with white mottling, ventrally with brown areas on pallid yellow as also reported by Valdez-Mondragón and Cortez-Roldán (2016) ( Figs 28–31 ). Although around 500 km separate the type locality (Ocosingo, Chiapas) from the locality (Cueva Li Nita, Huautla de Jiménez, Oaxaca) reported by Valdez-Mondragón and Cortez-Roldán (2016) ( Fig. 45 ), as well as different habitats, we cannot know the geological histories of these areas. Additional molecular evidence might help to corroborate the morphology between specimens from both localities and understand these distantly allopatric populations.

Natural history. Raven (1987) did not report any natural history data about the specimens collected from the type locality. However, Valdez-Mondragón and Cortez-Roldán (2016) mentioned that the specimen from Cueva Li Nita was collected inside the cave, in a temperate forest at 1919 m of elevation. Although the male specimen was collected within the cave, it does not present any troglomorphism or adaptation to cave life.

Distribution. MEXICO: Chiapas, Oaxaca ( Fig. 45 ).

Figures

FIGURE 45. Known records of Mexentypesa hidalguensis sp. nov. (red circle) and M. chiapas (red diamonds).

FIGURES 28–31. Mexentypesa chiapas Raven, 1987. Male: 28–29, Habitus, dorsal and ventral views, respectively. 30, Carapace, dorsal view. 31, Prosoma, ventral view showing coxae, sternum, labium, and endites (arrow indicates cuspules). Scale bars 0.5 mm (28, 29), 0.2 mm (30, 31). Modified of Valdez-Mondragón and Cortez-Roldán (2016).

FIGURES 32–36. Mexentypesa chiapas Raven, 1987. Male: 32–33, Left palp, prolateral and retrolateral views, respectively. 34, Left palp, ventral view. 35, Left palp, prolateral-apical view (arrow indicates apical spines on cymbium). 36, Detail of the bulb and embolus, ventral view. Scale bars 0.5 mm (35), 1 mm (32–34, 36). Modified of Valdez-Mondragón and Cortez-Roldán (2016).

FIGURES 37–44. Mexentypesa chiapas Raven, 1987. Male: 37, Tibia I, retrolateral view. 38, Tarsus I, retrolateral view. 39, Metatarsus and tarsus I, dorsal view (arrow indicates the small finger-shaped projection on retrolateral-ventral part of metatarsus). 40, Metatarsus I, retrolateral view (ditto). 41, Detail of the small finger-shaped projection on retrolateral-ventral part of metatarsus I. 42, Spination pattern on legs III and IV. 43, Endites, ventral view; detail of the cuspules. Female: 44, Seminal receptacles, dorsal view. Scale bars 0.2 mm (41), 0.5 mm (38, 40, 43), 1 mm (37, 39), 2 mm (42). Modified of Valdez- Mondragón and Cortez-Roldán (2016) (Figs 37–43), Modified of Raven (1987) (Fig 44).