Mecolaesthus trampa Huber

Huber, Bernhard A. & Villarreal, Osvaldo, 2020, On Venezuelan pholcid spiders (Araneae, Pholcidae), European Journal of Taxonomy 718, pp. 1-317: 124-127

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Mecolaesthus trampa Huber

sp. nov.

Mecolaesthus trampa Huber   sp. nov.

Figs 427–428 View Figs 427–434 , 435–443 View Figs 435–443 , 462–464 View Figs 462–470 , 1044


Distinguished from similar congeners ( M. grandis   group) by armature of male chelicerae ( Figs 441– 442 View Figs 435–443 ; pair of large frontal processes divided into lateral apophysis with 3–5 modified hairs each and frontal ridge with 4–5 modified hairs each; small process more distally, with 3–4 modified hairs each), by shape of main bulbal process ( Figs 438–440 View Figs 435–443 ; distinctive transversal prolateral sclerite), by shape of epigynum ( Figs 462–463 View Figs 462–470 ; triangular plate with pair of additional low sclerotized processes laterally), and by internal female genitalia ( Figs 443 View Figs 435–443 , 463–464 View Figs 462–470 ; distinctive pair of anterior processes).


The species name refers to the type locality; noun in apposition.

Type material

VENEZUELA   – Táchira • ♂ holotype, ZFMK (Ar 21926), SE Pregonero, forest near La Trampa (7.9236° N, 71.7152° W), 1300 m a.s.l., 10 Feb. 2020 (B.A. Huber, O. Villarreal M., Q. Arias C.) GoogleMaps   .

Other material examined

VENEZUELA   – Táchira • 2 ♂♂, 3 ♀♀, ZFMK (Ar 21927–28), and 1 ♂, 1 ♀ in pure ethanol, ZFMK (Ven20-122), same collection data as for holotype GoogleMaps   .


Male (holotype)

MEASUREMENTS. Total body length 3.5, carapace width 1.3. Distance PME–PME 110 µm; diameter PME 120 µm; distance PME–ALE 120 µm; diameter AME 25 µm; distance AME–AME 20 µm. Leg 1: 50.7 (12.0 +0.6+12.1 + 23.1 +2.9), tibia 2: 7.9, tibia 3: 6.0, tibia 4: 6.9; tibia 1–4 diameters: 120 µm, 140 µm, 150 µm, 150 µm; tibia 1 L/d: 101.

COLOR (in ethanol). Carapace pale ochre-gray with wide median dark band and lateral marginal dark bands, ocular area and clypeus also darkened; sternum pale ochre-grey, labium darker brown; legs pale ochre, without darker rings; abdomen pale greenish-gray, dorsally and laterally with dark bluish marks, ventrally with small brown mark in gonopore area, light brown book lung covers, with large median bluish mark; without lateral anterior plates opposing fourth coxae and without plate above pedicel opposing carapace inflation.

BODY. Habitus similar to M. lechosa Huber   sp. nov. (cf. Figs 429–430 View Figs 427–434 ). Ocular area distinctly raised. Carapace anteriorly with distinct thoracic groove, posteriorly slightly inflated. Clypeus unmodified. Sternum wider than long (0.90/0.75). Abdomen slightly elongated, pointed at spinnerets.

CHELICERAE. As in Figs 441–442 View Figs 435–443 , with pair of large frontal processes divided into lateral apophysis with 3–5 modified (short conical) hairs each and frontal ridge with 4–5 modified hairs each; with pair of small processes more distally, each with 3–4 modified hairs.

PALPS. In general very similar to putative close relatives [e.g., M. tuberculosus ( González-Sponga, 2009)   ; cf. Figs 365–366 View Figs 365–366 ]; coxa with retrolateral apophysis, trochanter with very small ventral process, femur proximally with large retrolateral process, distally with prominent rounded ventral process, retrolateral trichobothrium of tibia in very distal position; procursus ( Figs 435–437 View Figs 435–443 ) at basis with bifid dorsal process with branches of unequal length, with small retrolateral apophysis, distally with pair of partly membranous processes; genital bulb complex ( Figs 438–440 View Figs 435–443 ), distally mostly membranous/whitish but with distinctive prolateral transversal sclerite (arrows in Figs 438–439 View Figs 435–443 ).

LEGS. Without spines and curved hairs; few vertical hairs; coxa 4 unmodified; retrolateral trichobothrium of tibia 1 at 3%; prolateral trichobothrium present on all leg tibiae; tarsus 1 with ~40–45 pseudosegments, mostly distinct.

Male (variation)

Tibia 1 in two other males: 10.1, 11.7; other males with indistinct darker rings on leg femora (subdistally).


In general similar to male ( Figs 427–428 View Figs 427–434 ) but without carapace inflation, book lung covers not  darkened. Tibia 1 in three females: 8.0, 8.1, 8.1. Epigynum ( Fig. 462 View Figs 462–470 ) relatively small, triangular, anterior margin straight, with pair of low sclerotized posterior processes laterally (arrows in Fig. 463 View Figs 462–470 ); anterior part of internal receptacle visible in uncleared specimens; without posterior plate. Internal genitalia ( Figs 443 View Figs 435–443 , 463–464 View Figs 462–470 ) with pair of distinctive anterior processes arising from sclerite with pore plates, with additional pair of anterior sclerites extending towards lateral and large median receptacle.


Known from type locality only, in Venezuela   , Táchira (Fig. 1044).

Natural history

Most specimens were collected in sheltered spaces near the ground, in similar webs but less exposed than M. arepa Huber   sp. nov. at the same locality.


Germany, Bonn, Zoologische Forschungsinstitut und Museum "Alexander Koenig"


Zoologisches Forschungsmuseum Alexander Koenig