Mesabolivar niteroi, Huber, 2018

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 : 107-111

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Mesabolivar niteroi

sp. n.

Mesabolivar niteroi sp. n.

Figs 449–451 View FIGURES 447–458 , 481–487 View FIGURES 481–488 , 521 View FIGURES 520–537

Diagnosis. Easily distinguished from most known congeners by shape of male palp (very similar to M. itapoa , cf. Huber 2015: figs 193–194; wide femur; distinctive shape of procursus; genital bulb with slightly sclerotized process and long membranous side branch), by shape of male chelicerae ( Figs 481–482 View FIGURES 481–488 ; distinctive pair of processes), by pair of posterior processes on female sternum, and by shape of epigynum ( Figs 484–486 View FIGURES 481–488 ; distinctive processes on anterior plate; rows of stronger hairs on small sclerotized plates behind epigynum); from very similar M. itapoa by male chelicerae (apophyses much less projecting in lateral view, compare Fig. 482 View FIGURES 481–488 and Huber 2015: fig. 198), by anterior epigynal plate (only one pair of processes in posterior view, compare Figs 486, 488 View FIGURES 481–488 ); also by shorter processes on female sternum (<100 µm long vs. 150 µm in M. itapoa ).

Etymology. The specific name is derived from the type locality; noun in apposition.

Type material. BRAZIL: Paraná: ♂ holotype, 1♀ paratype, UFMG (21530–31), 2♂ 1♀ paratypes, ZFMK (Ar 19198), 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).

Other material examined. BRAZIL: Paraná: 1♀ in pure ethanol, ZFMK (Br 14-130), same data as types ; 2♀, ZFMK (Ar 19199), and 1♀ in pure ethanol, ZFMK (Br 14-136), same data but night collecting . 1♂ 4♀, ZFMK (Ar 19200), 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); 1♀ in pure ethanol, ZFMK (Br 14-142), same data .

Description. Male (holotype)

MEASUREMENTS. Total body length 2.3, carapace width 1.05. Distance PME-PME 95 µm, diameter PME 110 µm, distance PME-ALE 80 µm, distance AME 25 µm, diameter AME 25 µm. Sternum width/length: 0.75/0.55. Leg 1: 21.3 (5.1 + 0.5 + 5.5 + 9.2 + 1.0), tibia 2: 3.4, tibia 3: 2.5, tibia 4: 4.4; tibia 1 L/d: 69. Femora 1–4 width (at half length): 0.17, 0.22, 0.20, 0.14.

COLOR. Carapace pale ochre, with darker margins and three pairs of darker radial lines, ocular area and clypeus also darker; sternum ochre-brown; legs ochre to light brown, without light or dark rings; abdomen greenish grey with dark bluish marks dorsally and laterally; genital plate in front of gonopore slightly darker.

BODY. Habitus as in Figs 449–450 View FIGURES 447–458 ; ocular area raised; carapace with distinct median furrow; clypeus and sternum unmodified.

CHELICERAE. As in Figs 481–482 View FIGURES 481–488 , with distinctive pair of wide frontal projections, similar M. itapoa but less projecting in lateral view.

PALPS. Very similar M. itapoa (see Huber 2015: figs 193–194), but proximal segments slightly stronger (femur maximum diameter 340 µm vs. 300 µm; tibia maximum diameter 240 µm vs. 210 µm); procursus slightly different in shape (compare Fig. 483 View FIGURES 481–488 and Huber 2015: fig. 196; proximal ventral process larger, narrowing towards distal); bulbal process in dorsal view slightly different (distal sclerite narrower).

LEGS. Without spines and curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 4.5%; prolateral trichobothrium present on tibia 1; tarsus 1 with>15 pseudosegments, distally distinct.

Male (variation). Tibia 1 in three other males: 4.7, 5.2, 5.6.

Female. In general similar to male ( Fig. 451 View FIGURES 447–458 ) but sternum with pair of processes at posterior margin; processes not as long and slender as in M. itapoa (rather conical, 70–100 µm long, vs. 150 µm in M. itapoa ). Tibia 1 in eight females: 3.0–3.5 (mean 3.2). Anterior epigynal plate strongly protruding, with only one pair of short processes, without pocket but with strongly sclerotized plate on frontal side ( Figs 484–486 View FIGURES 481–488 ); posterior plate narrow and weakly developed, with row of 3–4 stronger hairs on small sclerotized plates on each side. Internal genitalia as in Figs 487 View FIGURES 481–488 , 521 View FIGURES 520–537 , very small relative to epigynum, with tiny elongate pore-plates embedded in transversal sclerite.

Natural history. The spiders were found in small wet cavities in the ground. When disturbed, they vibrated with high frequency and small amplitude and eventually ran away quickly.

Distribution. Known from two neighboring sites in Saint-Hilaire/Lange National Park, Paraná state ( Brazil) only ( Fig. 438 View FIGURES 433–446 ).


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