Mesabolivar anseriformis (González-Sponga, 2011),

Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, Zootaxa 4395 (1), pp. 1-178: 36-38

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Mesabolivar anseriformis (González-Sponga, 2011)


Mesabolivar anseriformis (González-Sponga, 2011) 

Figs 88–89View FIGURES 78–89, 122–127View FIGURES 122–127, 135–137View FIGURES 128–137

Mesabolivar  sp. 4: Astrin et al. 2006: 444 (CO1 sequences).

Caruaya anseriformis González-Sponga, 2011b: 41  , pl. 2, figs 1–7 (♂, Venezuela). Mesabolivar anseriformis: Huber et al. 2014a: 418  .

Diagnosis. Easily distinguished from known congeners by male pedipalp ( Figs 122–123View FIGURES 122–127; long and widely curved procursus with hinged tip, complex bulbal process with retrolateral apophysis), by armature of male chelicerae ( Fig. 124View FIGURES 122–127; pair of apophyses overhanging fangs), and by epigynum ( Figs 125–126View FIGURES 122–127, 135–136View FIGURES 128–137; strongly protruding anterior plate with pair of shallow pockets on scape-like posterior process).

Type material. VENEZUELA: Bolívar: ♂ holotype, 1♂ paratype, MIZA ( MAGS 938), Municipio Gran Sabana, Salto Caruay (5°12.2’N, 62°23.2’W), 1000 m a.s.l., 30.iv.1986 (S. Callizo), not examined (but see Notes below).

Material examined. VENEZUELA: Bolívar: 8♂ 2♀ 2 juvs, ZFMK (Ar 19012), km 109 from El Dorado to Santa Elena de Uairen (6.013°N, 61.391°W), ~ 800 m a.s.l., domed webs from ground to ~ 2 m, 3.xii.2002 (B.A. Huber); 1♂ in pure ethanol, ZFMK (Ven02/100-52), same data. 2♂ in pure ethanol, ZFMK (Ven02/100-17), km 118 from El Dorado to Santa Elena de Uairen (5.965°N, 61.392°W), ~ 1250 m a.s.l., 3.xii.2002 (B.A. Huber). 1♂ 1♀, ZFMK (Ar 19013), km 126 from El Dorado to Santa Elena de Uairen (5.949°N, 61.439°W), ~ 1400 m a.s.l., 3.xii.2002 (B.A. Huber); 4♂ 2♀ in pure ethanol, ZFMK (Ven02/100-14), same data.

Redescription. Male ( ZFMK Ar 19012)

MEASUREMENTS. Total body length 2.9, carapace width 1.2. Distance PME-PME 150 µm, diameter PME 90 µm, distance PME-ALE 110 µm, distance AME-AME 30 µm, diameter AME 30 µm. Sternum width/length: 0.85/ 0.60. Leg 1: 51.4 (12.4 + 0.5 + 11.9 + 23.7 + 2.9), tibia 2: 7.1, tibia 3: 4.8, tibia 4: 6.3; tibia 1 L/d: 99. Femora 1–4 width (at half length): 0.16, 0.26 (0.30 in distal third), 0.18, 0.15.

COLOR (in ethanol). Carapace pale ochre-yellow, slightly orange medially, with dark median line and brown lateral marginal bands; ocular area and clypeus not darkened; sternum orange; legs brown, without light or dark rings, coxae 1 and 4 whitish; abdomen greenish gray, posteriorly with dark internal marks, ventrally with light orange plate in front of gonopore.

BODY. Habitus as in Figs 88–89View FIGURES 78–89; ocular area slightly raised; carapace with shallow but distinct median furrow; clypeus unmodified; sternum unmodified.

CHELICERAE. With one pair of frontal apophyses overhanging fangs, not close to median line ( Fig. 124View FIGURES 122–127).

PALPS. As in Figs 122–123View FIGURES 122–127; coxa with small retrolateral apophysis; trochanter with large rounded retrolateroventral process; femur with retrolateral apophysis proximally and small unsclerotized ventral process distally; procursus widely curved, distal part hinged; bulbal process with distinctive retrolateral apophysis.

LEGS. Without spines; with curved hairs dorsally on all femora, tibiae, and metatarsi, on metatarsi 2 also ventrally and laterally; few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium present on tibia 1; tarsus 1 with ~50 pseudosegments, distally distinct.

Male (variation). Tibia 1 in four other males: 10.8, 10.9, 11.2, 11.7. Femora 2 in smaller males barely wider than other femora. Some males with few dark marks also anteriorly on abdomen.

Female. In general similar to male but all leg femora approximately same width; without curved hairs on legs. Tibia 1 in 2 females: 7.3, 7.8. Epigynum as in Figs 125–126View FIGURES 122–127, 135–136View FIGURES 128–137; anterior plate strongly protruding, with pair of shallow pockets on scape-like posterior process; posterior plate simple. Internal genitalia as in Figs 127View FIGURES 122–127, 137View FIGURES 128–137, with pair of small pore-plates.

Natural history. The type specimens were collected from between tree buttresses (González-Sponga 2011b).

Distribution. Known from several localities in Bolívar state, Venezuela ( Fig. 725View FIGURES 724–725).

Notes. I have not directly examined the two male type specimens in MIZA. However, photos of one of the specimens were kindly provided by Quintin Arias and all diagnostic structures seem to be identical.

In contrast to González-Sponga (2011b), it is not the femora 3 that are wider, but femora 2.


Museo del Instituto de Zoologia Agricola Francisco Fernandez Yepez


Zoologisches Forschungsmuseum Alexander Koenig














Mesabolivar anseriformis (González-Sponga, 2011)

Huber, Bernhard A. 2018

Mesabolivar anseriformis:

Huber et al. 2014: 418

Caruaya anseriformis González-Sponga, 2011b: 41

Gonzalez-Sponga 2011: 41