Mesabolivar huberi, Machado, Éwerton O., Brescovit, Antonio D. & Francisco, Rafael C., 2007

Machado, Éwerton O., Brescovit, Antonio D. & Francisco, Rafael C., 2007, Three new ground dweller Mesabolivar González-Sponga, 1998 (Araneae: Pholcidae) from Blumenau, Santa Catarina, Brazil, Zootaxa 1560, pp. 55-61: 56

publication ID 10.5281/zenodo.178315

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scientific name

Mesabolivar huberi

n. sp.

Mesabolivar huberi  n. sp.

( Figs. 1–11View FIGURES 1 – 11)

Types. Male holotype from Parque Natural Municipal Nascentes do Ribeirão Garcia (27 o01’– 27 o06’ S; 49 o04’– 49 o 10 ’ W; 290–910 m), Blumenau, Santa Catarina, Brazil, 23.I. 2005, R.C. Francisco col. with pitfall traps, deposited in IBSP 62441. Paratypes: 1 male and 2 females, same data as holotype, 18.IV. 2004, ( IBSP 62438–62440).

Etymology. The species is named in honour of the Austrian arachnologist Bernhard A. Huber from Alexander Koenig Zoological Research Museum (Bonn, Germany).

Diagnosis. The male can be distinguished from the congeners by the single pair of large and curved cheliceral apophyses ( Fig. 1View FIGURES 1 – 11) and the constriction on the basal segment of chelicerae ( Fig. 2View FIGURES 1 – 11), combined with the shape of the strong procursus ( Fig. 4View FIGURES 1 – 11) with a prominent membranous projection on the retrolateral side of the procursus tip ( Figs. 6–7View FIGURES 1 – 11). The female can be distinguished by the shape of the ventral pair of projections on the epigynal plate combined with the relatively large and shallow median pocket ( Figs. 9–10View FIGURES 1 – 11).

Description. Male (Holotype): Total length 1.9, carapace width 1.0; leg I: 19.8 (4.6 + 0.4 + 5.1 + 8.5 + 1.2), tibia II: 3.0, tibia III: 2.1, tibia IV: 3.7, tibia I L/d: 47. Carapace light brown; sternum light ochre. Distinct thoracic groove. Eight eyes on slightly elevated ocular area; distance PME –ALE about 70 % of PME diameter. Chelicera light brown, basal segment with a median constriction in lateral view ( Fig. 2View FIGURES 1 – 11) and with one large frontal, very curved apophysis ( Figs. 1–3View FIGURES 1 – 11), approximately perpendicular to the chelicera ( Fig. 2View FIGURES 1 – 11). Palps as in figs. 4–8. Palpal coxa with narrow and approximately rectangular retrolateral apophysis, conical at tip ( Fig. 4View FIGURES 1 – 11). Palpal femur proximally with relatively small retrolateral apophysis ( Fig. 4View FIGURES 1 – 11). Procursus dark brown, strongly curved in the proximal region ( Fig. 4View FIGURES 1 – 11), with a strong proximal-prolateral hair ( Fig. 5View FIGURES 1 – 11). Procursus with distinct tip very sclerotised and enlarged laterally, with a distal and slightly retrolateral projection and a salient retrolateral semitransparent membranous projection ( Figs. 6–7View FIGURES 1 – 11). Bulb simple, embolar division slightly curved dorsally with no transparent projection ( Fig. 8View FIGURES 1 – 11). Legs light brown; without spines, vertical or curved hairs. Tarsus I with approximately 18 pseudosegments. Opisthosoma globular, pale green, with several lateral bluish-green spots.

Female. (Paratype IBSP 62439): Total length 2.5, carapace width 0.9; leg I: 11.8 (2.8 + 0.4 + 3.1 + 4.5 + 1.0), tibia II: 2.0, tibia III: 1.6, tibia IV: 2.7, tibia I L/d: 31. In general appearance very similar to male. Tarsus I with approximately 18 pseudosegments. Epigynum dark brown, elevated, with a medium-sized median shallow pocket, situated slightly anterior, and a pair of ventral lateral projections ( Figs. 9–10View FIGURES 1 – 11). Internal genitalia with two contiguous and almost square pore plates ( Fig. 11View FIGURES 1 – 11).

Variation. Three males: carapace width 0.9 –1.0; tibia I: 4.3–5.1. Five females: carapace width 0.8 –1.0.

Other material examined. Brazil: Santa Catarina: Blumenau, Parque Natural Municipal Nascentes do Ribeirão Garcia; 27 o01’– 27 o06’ S; 49 o04’– 49 o 10 ’ W; R.C. Francisco col. with pitfall traps, 18.IV.2004, 1ɗ, 1 Ψ ( IBSP 62444, 62447); 17.VII.2004, 1Ψ ( IBSP 62446); 20.X.2004, 1Ψ ( IBSP 62445).

Distribution. Known only from type locality.

Natural history. The specimens were all collected with pitfall traps, suggesting a ground level life style. The pitfall traps were installed in four sampling periods for one year (18.IV. 2004; 17.VII. 2004; 20.X. 2004; 23.I. 2005), and M. huberi  n. sp. was collected in three of them (see material examined). Sampling dates suggest the presence of the species throughout the year, but too few specimens (eight) were collected to allow more assumptions.


Instituto Biologico de Sao Paulo