Chisosa caquetio Huber

Huber, Bernhard A. & Carvalho, Leonardo S., 2019, Filling the gaps: descriptions of unnamed species included in the latest molecular phylogeny of Pholcidae (Araneae), Zootaxa 4546 (1), pp. 1-96: 31-33

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Chisosa caquetio Huber

sp. n.

Chisosa caquetio Huber  sp. n.

Figs 105–113View FIGURES 105–109View FIGURES 110–116

Gen.n. Geneve59: Eberle et al. 2018 (molecular data); Huber et al. 2018: fig. 2.

Type material. NETHERLANDS ANTILLES: ♂ holotype, ZFMK (Ar 20618), Curaçao, Jan Kok Lodges (12.217°N, 69.051°W), Winkler extraction, sieved litter from garden, 12–13.ix.2011 (R. Jocqué, E. Tybaert)GoogleMaps  .

Other material examined. NETHERLANDS ANTILLES, Curaçao: 1♂ 4♀ 3 juvs in pure ethanol, ZFMK (Ar 20619), same data as holotypeGoogleMaps  . 1♂ 6♀ 2 juvs, MHNG, Grot van Hato [12.180°N, 68.948°W], 9–11.ii.1985 (P. Strinati, V. Aellen). 1♂ 2♀ 5 juvs, MHNG, Grot van San Pedro [~ 12.255°N, 69.044°W], 13.ii.1985 (P. Strinati, V. Aellen).

Aruba: 3♂ 5♀ 3 juvs, MHNG, Cueba de Quadirikiri [12.482°N, 69.898°W], 12.ii.1985 (P. Strinati, V. Aellen)GoogleMaps  . 1♀, MHNG, Tunnel of Love [12.466°N, 69.897°W], 12.ii.1985 (P. Strinati, V. Aellen)GoogleMaps  . 1♀ 2 juvs, MHNG, Grot van Fontein [12.495°N, 69.907°W], 12.ii.1985 (P. Strinati, V. Aellen).

Etymology. The species remembers the Caquetio Indians, natives of Curaçao, Aruba, and neighboring regions at the time of the Spanish conquest; noun in apposition.

Diagnosis. Easily distinguished from known congeners by male chelicerae ( Figs 107–108View FIGURES 105–109; four cone-shaped apophyses on each side), by procursus and genital bulb ( Figs 105–106View FIGURES 105–109; distinctive shapes of processes), and by external and internal female genitalia ( Figs 109View FIGURES 105–109, 112–113View FIGURES 110–116; anterior epigynal plate without pair of pockets; pore plates far apart; female of C. baja  unknown). From most Arteminae  also distinguished by small body size.

Description. Male (holotype). MEASUREMENTS. Total length 0.80, carapace width 0.40. Distance PME-PME 30 µm; diameter PME 50 µm; distance PME-ALE 20 µm; distance AME-AME 5 µm, diameter AME 10 µm. Leg 1: 2.30 (0.60 + 0.15 + 0.60 + 0.65 + 0.30), tibia 2: 0.50, tibia 3 missing, tibia 4: 0.60; tibia 1 L/d: 10.

COLOR (in ethanol). Carapace pale ochre-yellow with three pairs of marginal black spots and median Y-shaped mark; sternum whitish, legs pale ochre-yellow. Abdomen monochromous, pale greenish-gray.

BODY. Habitus as in Figs 110–111View FIGURES 110–116. Ocular area barely elevated, thoracic furrow absent; clypeus unmodified. Sternum slightly wider than long (0.26/0.24), unmodified.

CHELICERAE. As in Figs 107–108View FIGURES 105–109, with several sclerotized cones; without modified hairs; with stridulatory ridges. PALPS. As in Figs 105–106View FIGURES 105–109; coxa unmodified, trochanter with ventral rounded projection, femur very strong, with stridulatory pick (modified hair) proximally, patella ventrally reduced, tarsus proximally unsclerotized, procursus with dorsal apophysis and ventral pocket, bulb with complex set of projections.

LEGS. Without spines and curved hairs, few vertical hairs; retrolateral trichobothrium of tibia 1 at 62%; prolateral trichobothrium present on all tibiae; tarsus 1 with 5–6 pseudosegments, poorly visible.

Male (variation). Tibia 1 in 5 other males: 0.57–0.72 (mean 0.68). Males from caves tend to have longer legs (tibia 1: 0.68–0.72 versus 0.57–0.60). The males from Aruba appear slightly different, with larger palps, minimally different procursus and bulb shapes and with the most distal pair of cheliceral apophyses slightly less diverging; one male from Aruba without AME.

Female. In general similar to male. Tibia 1 in 17 females: 0.50–0.68 (mean 0.61). Females from caves tend to have longer legs (tibia 1: 0.54–0.68 versus 0.50–0.53). Epigynum simple externally ( Figs 112–113View FIGURES 110–116), with additional small plate anteriorly and large posterior plate. Internal genitalia with pair of oval pore plates wide apart ( Fig. 109View FIGURES 105–109).

Distribution. Known from Curaçao and Aruba ( Fig. 344View FIGURE 344).