Mexentypesa chiapas , Raven 1987
Creators: name: Salinas-Velasco, Héctor Vicente
name: Valdez-Mondragón, Alejandro
name: Villegas, Julián Bueno-
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Nemesiidae
Mexentypesa
Mexentypesa chiapas

description: 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).
description: Published as part of 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, pp. 233-244 in Zootaxa 5453 (2) on pages 241-243, DOI: 10.11646/zootaxa.5453.2.4, http://zenodo.org/record/11233890