Mesabolivar cavicelatus Machado et al. 2007
Creators: name: Huber, Bernhard A.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Pholcidae
Mesabolivar
Mesabolivar cavicelatus

description: Mesabolivar cavicelatus Machado et al., 2007
Figs 463–465, 516–519, 534–537
Mesabolivar sp. 5: Astrin et al. 2006: 444 (molecular data: CO1, 16S).
Mesabolivar cavicelatus Machado et al. 2007b: 171, figs 24–33 (♂♀, Brazil: São Paulo).
Diagnosis. (amendments; see Machado et al. 2007b). This species is similar to M. tandilicus (Mello-Leitão, 1940) (see redescription in Machado et al. 2013). Males of the two species can be distinguished by the cheliceral armature (frontal apophyses more proximal and longer in M. tandilicus; compare Machado et al. 2007b: figs 24–25 with Machado et al. 2013: figs 1–2) and by the tip of the procursus (more complex modifications in M. tandilicus; compare Fig. 516 with Machado et al. 2013: fig. 6); females of M. tandilicus differ by presence low processes at posterior margin of epigynal plate (Huber 2000: fig. 828; Machado et al. 2013: fig. 8).
Type material. BRAZIL: São Paulo: ♂ holotype, 1♀ paratype, IBSP (53009–10), São Paulo, Parque Estadual de Cantareira (46°37’S, 23°25’W), 2–7.v.2005 (holotype) and 13–20.xii.2001 (paratype) (F. Yamamoto), not examined (according to Machado 2011, the types were lost in the Butantan fire of May 2010).
New records. BRAZIL: Rio de Janeiro: 22♂ 15♀ 5 juvs, ZFMK (Ar 19212–16), ~ 4 km NW Penedo (22°24.5’S, 44°33.0’–33.4’W), forest along river, 700–770 m a.s.l., 14–16.viii.2007 (B.A. Huber); 2♂ 8♀ in pure ethanol, ZFMK (Br07/100-8, 13, 39).
Assigned tentatively. BRAZIL: São Paulo: 19♂ 36♀, ZFMK (Ar 19217–18), Ubatuba, Fazenda Angelim (23.392°S, 45.062°W), 16–18.xii.2003 (B.A. Huber); 4♂ 11♀ 2 juvs in pure ethanol, ZFMK (Br 03/100-4), same data.
Paraná: 1♂ 1♀, ZFMK (Ar 19219), Saint-Hilaire / Lange National Park, forest along river above Fazenda Niteroi (25.657°S, 48.601°W), ~ 100 m a.s.l., 11.x.2014 (B.A. Huber, L.S. Carvalho); 3♀ in pure ethanol, ZFMK (Br 14-129), same data; 2♂ 4♀, ZFMK (Ar 19220), and 1♀ in pure ethanol, ZFMK (Br 14-135), same data but night collecting. 1♀, ZFMK (Ar 19221), Saint-Hilaire/Lange National Park, forest above Hotel Mata Atlântica (25.670°S, 48.600°W), ~ 200–300 m a.s.l., night collecting, 12.x.2014 (B.A. Huber, L.S. Carvalho).
Description (amendments; see Machado et al. 2007b). Male eye measurements: distance PME-PME 80 µm, diameter PME 90 µm, distance PME-ALE 80 µm, distance AME-AME 15 µm, diameter AME 30 µm. Tibia 1 in 42 newly examined males: 4.2–5.6 (mean 4.7); in 55 newly examined females: 2.9–3.8 (mean 3.3). Tibia 2/tibia 4 length in four males: 0.94–0.96; in two females: 0.91, 0.90 (in original description: 1.46 – female tibiae mismeasured). Femora 2 and 3 in some males much wider than other femora, in others barely wider (diameters femora 1–4 in two males: 0.14, 0.15, 0.16, 0.14; 0.20, 0.30, 0.29, 0.21). Male tibia 1 L/d: 48. Retrolateral trichobothrium on tibia 1 at 5%; prolateral trichobothrium present on tibia 1.
Specimens from Ubatuba and from Saint-Hilaire/Lange National Park differ slightly and are therefore assigned tentatively: males with slightly different procursus tip (compare Figs 516, 517); females differ slightly in shape of dark sclerotized arc in internal genitalia (compare Figs 518, 519). Note, however, that the difference between Figs 518 and 519 results in part from slightly different angles of view: the genitalia of the female from Penedo (Fig. 518) are shown in slightly posterior view (in better agreement with fig. 33 in Machado et al. 2007b) while Fig. 519 shows the cleared genitalia in perfect ventral view. The pore-plates do not seem to differ among specimens from different localities.
Natural history. The spiders were found in leaf litter. At Saint-Hilaire/Lange National Park they occupied a slightly higher level in the litter than M. niteroi; at Penedo, they occupied a slightly deeper level than M. goitaca, with their small webs entirely hidden under the leaves (not partly exposed as in M. goitaca). When disturbed, they either vibrated rapidly with small amplitude or ran away.
Distribution. Widely distributed from eastern Paraná state to western Rio de Janeiro state (Brazil) (Fig. 738), but note that specimens from Paraná are assigned tentatively.
description: Published as part of Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, pp. 1-178 in Zootaxa 4395 (1) on page 121, DOI: 10.11646/zootaxa.4395.1.1, http://zenodo.org/record/1202519