Mesabolivar similis

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: 45

publication ID

https://doi.org/10.11646/zootaxa.4395.1.1

publication LSID

lsid:zoobank.org:pub:B43C234D-45C4-4A6D-9836-8A7524A5B291

persistent identifier

http://treatment.plazi.org/id/160AC713-C658-FFA9-2A9C-9E3D37027E2A

treatment provided by

Plazi

scientific name

Mesabolivar similis
status

sp. n.

Mesabolivar similis  sp. n.

Figs 141–142View FIGURES 138–149, 165–171View FIGURES 165–171, 194View FIGURES188–199

Diagnosis. Distinguished from most known congeners by armature of male chelicerae ( Figs 165–166View FIGURES 165–171; two pairs of frontal apophyses, one oblique pair distally and one smaller conical pair proximally), by shape of procursus ( Figs 167–169View FIGURES 165–171; in general as in M. togatus  , cf. Huber 2000: fig. 856; widely curved, with distal prolateral process and membranous structures), and by shape of epigynum ( Figs 170View FIGURES 165–171; in lateral view like M. togatus  , cf. Huber 2000: fig. 862; oval anterior plate with posterior margin divided into three lobes by whitish membrane); from two most similar congeners ( M. togatus  , M. baianus  ) by much smaller proximal cheliceral apophyses ( Figs 165–166View FIGURES 165–171); from M. baianus  also by shapes of lobes on anterior epigynal plate (median lobe wider; lateral lobes narrower; Figs 170View FIGURES 165–171, 194View FIGURES188–199).

Etymology. The specific name refers to the similarity of this species to M. togatus  ; adjective.

Type material. BRAZIL: Bahia: ♂ holotype, UFMGAbout UFMG (21509), 1♂ 1♀ (♀ abdomen only, prosoma in pure ethanol) paratypes, ZFMKAbout ZFMK (Ar 19039), Fazenda Morro de Pedra (12°31.6’–31.8’S, 40°36.1–36.4’W), 490 m a.s.l., 14.v.2015 (B.A. Huber, L.S. Carvalho).

Other material examined. BRAZIL: Bahia: 2♀ (one ♀ abdomen with ♂ paratype) in pure ethanol, ZFMKAbout ZFMK (Br15-182), same data as types. 2♂ 1 ♀ in pure ethanol, UFPI (ARA 278), Maracás, near Sede da Ferbasa (13.471°S, 40.438°W), 955 m a.s.l., 11–13.iii.2012 (E. Araújo, A. Medeiros).

Description. Male (holotype)

MEASUREMENTS. Total body length 4.5, carapace width 1.7. Distance PME-PME 125 µm, diameter PME 170 µm, distance PME-ALE 130 µm, distance AME-AME 30 µm, diameter AME 65 µm. Sternum width/length: 1.0/ 0.67. Leg 1 missing, tibia 2: 11.1, tibia 3: 6.4, tibia 4: 10.0. Femora 1–4 width (at half length): –, 0.26, 0.26, 0.19.

COLOR (in ethanol). Carapace ochre-yellow, with wide dark brown median mark including posterior part of ocular area, no lateral marks; clypeus not darkened; sternum orange to light brown; legs brown, tips of femora and tibiae lighter, indistinct darker rings on femora (subdistally) and tibiae (proximally and subdistally); abdomen greenish gray, dorsally and laterally densely covered with dark bluish marks, ventrally with orange to light brown plate in front of gonopore, very indistinct plate in front of spinnerets.

BODY. Habitus as in Fig. 141View FIGURES 138–149; ocular area raised; carapace with distinct median furrow; clypeus unmodified; sternum unmodified.

CHELICERAE. With two pairs of frontal apophyses, proximal pair small and conical, distal pair oblique, angle between outer margins ~100° ( Figs 165–166View FIGURES 165–171).

PALPS. In general like in M. togatus  (cf. Huber 2000: figs 855–856); palps in these two species may be indistinguishable (the minimal differences between Figs 158–159View FIGURES156–164 and Figs 167, 169View FIGURES 165–171 may partly be due to slightly different angles of view and may be in the same order of magnitude as intraspecific variation).

LEGS. Without spines, without curved hairs, few vertical hairs.

Male (variation). Other male lighter, slightly smaller; carapace width: 1.3; leg 1: 57.3 (13.5 + 0.7 + 12.9 + 27.1 + 3.1), tibia 2: 9.3, tibia 3: 6.3, tibia 4: 9.1.

Female. In general similar to male ( Fig. 142View FIGURES 138–149). Tibia 1: 8.5 (missing in second female). Epigynum as in Figs 170View FIGURES 165–171, 194View FIGURES188–199, very similar to M. togatus  , especially to females from Bahia assigned tentatively to M. togatus  (compare Figs 190 and 194View FIGURES188–199). Internal genitalia as in Fig. 171View FIGURES 165–171, also very similar M. togatus  (compare Figs 171View FIGURES 165–171 and 189View FIGURES188–199).

Natural history. The spiders were found in large sheltered spaces among rocks and logs.

Distribution. Known from two localities in Bahia state ( Brazil) ( Fig. 727View FIGURES726–729).

UFMG

Universidade Federal de Minas Gerais

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Mesabolivar