Mexentypesa 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 : 234-235

Genus Mexentypesa Raven, 1987 .

Type species. Mexentypesa chiapas, Raven, 1987: 358 , f. 1–9 (Dmf). Type specimen non vidi. The authors considered that the information in the original description is enough to make a comparison between the type species and M. hidalguensis sp. nov.

Diagnosis. Updated from Raven (1987). Males have a retrolateral-ventral small finger-shaped projection on metatarsus I ( Figs 19, 20 , 39–41 ). Tibia I with only one massive retrolateral spine. Biserially dentated paired claws. Eyes on a distinctly raised tubercle, AER sightly procurved, PER sightly recurved. Labium without cuspules. Females with two seminal receptacles.

General description. Updated from Raven (1987). Small sized spiders. Carapace longer than wide, flat, with smooth surface, setose, pyriform-shaped, light or dark brown coloration ( Figs 1, 2 ). Foveal groove horizontal, slightly deep ( Fig. 2 ). Male coloration in most specimens is light to dark brown. Abdominal coloration light brown, with dark brown stains in males ( Figs 1 , 28 ); females lack stains on abdomen and have dark brown coloration ( Fig. 22 ). Sternum longer than wide, nonagonal in shape ( Figs 4 , 31 ), with sigilla near the labium or without sigilla. Endites long and setose, males with an apical-prolateral conspicuous conical apophysis, but absent on females. Endites with cuspules on the apical-retrolateral face ( Figs 7 , arrow in 31). Labium wider than long ( Figs 4 , 7 , 31 ). Chelicerae light or dark brown. Rastellum consists of numerous long setae or stout spines. Chelicerae promargin with row of medium teeth and very long setae. Many spines on tibiae I and metatarsi III and IV ( Figs 13–18 , 37, 38, 42 ). Claw tufts on all legs. Spinnerets beige or dark brown. PMS small and rounded apically, single segment, with spigots. PLS long and digitiform apically, all 3 segments with spigots: basal segment length> median segment> distal segment. Legs III and IV with numerous spines ( Figs 18 , 42 ). Females have two seminal receptacles with two lobes ( Figs 25 , 44 ). Palpal cymbium with dorsal spines ( Figs 10–12 , 32–36 ). Massive ventral and prolateral spines on the palpal tibiae ( Figs 8, 9 , 32 ). Palpal bulbs piriform ( Figs 10–12 , 32–34, 36 ).

Composition. Two species: Mexentypesa chiapas Raven, 1987 (Chiapas and Oaxaca, Mexico), and Mexentypesa hidalguensis sp. nov. (Hidalgo, Mexico).

Figures

FIGURES 13–21. Mexentypesa hidalguensis sp. nov. Male holotype: 13, Holotype tibia I, proventral view. 14, Paratype proventral view. 15–16, Left leg I, retrolateral and prolateral views, respectively. 17–18, Spination pattern on tibia I, III, and IV (arrows indicate the spines). 19, Left leg I, dorsal view. 20, Metatarsus I, showing the small finger-shaped projection on retrolateral-ventral part. 21, Tarsus I, retrolateral view.

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).

FIGURES 1–4. Mexentypesa hidalguensis sp. nov. Male holotype: 1, 3, Habitus, dorsal and ventral views, respectively. 2, Carapace, dorsal view. 4, Prosoma, ventral view showing coxae, sternum, labium, and endites.

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 22–25. Mexentypesa hidalguensis sp. nov. Female: 22, 24, Habitus, dorsal and ventral views, respectively. 23, Endites showing the cuspules. 25, Seminal receptacles, dorsal view.

FIGURES 5–12. Mexentypesa hidalguensis sp. nov. Male holotype: 5, Ocular region. 6, Chelicerae, lateral view. 7, Endites, ventral view; showing detail of the cuspules. 8–9, Right palp, retrolateral and prolateral views, respectively. 10–12, Right palp, retrolateral-apical, ventral-apical, and prolateral-apical views, respectively.

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).