Mesabolivar cyaneus ( Taczanowski, 1874 )

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 : 31

Mesabolivar cyaneus ( Taczanowski, 1874)

Figs 100–101 , 108–109

Pholcus cyaneus Taczanowski, 1874: 103 , pl. 2, fig. 6 (♂♀, Brazil: Amapá; see Note below). Blechroscelis cyanea: Mello-Leitão 1940b: 175 .

Blechroscelis rubristernus Caporiacco, 1947: 22 (♂♀, Guyana). Caporiacco 1948: 627, figs 19–21. Mesabolivar rubristernus: Huber 2000: 204 , figs 796–800.

Mesabolivar cyaneus: Huber 2000: 190 . Huber & Zhu 2001: 152 (synonymy of M. rubristernus ).

Diagnosis. Distinguished from most similar known relative ( M. spinosus ) by more slender and longer procursus (compare Figs 101 and 103 ), bulbal process distally simpler (compare Figs 109 and 111 ), and by female external and internal genitalia (epigynum narrower; relatively smaller internal sclerotized structure, compare Huber 2000: figs 799–800 and Figs 112, 114 ).

Type material. BRAZIL (see Note below): Amapá: ♂ lectotype, 1♂ paralectotype, MIZW, “Uassa-Guyane française” [Rio Uaça, ~ 4.13°N, 51.53°W], leg. K. Yelski, examined ( Huber & Zhu 2001).

Note. Taczanowski (1874) described the species from “Uassa et de Saint Laurent de Maroni”. Huber & Zhu (2001) designated a lectotype from “Uassa”. According to various authors (e.g., Mlíkovský 2009), this locality is now Rio Uaça in the state of Amapá, Brazil.

New records. VENEZUELA: Bolívar: 3♂ 4♀, ZFMK (Ar 19650), km 109 from El Dorado (6°01’N, 61°23.5’W), ~ 800 m a.s.l., domed webs near ground, 3.xii.2002 (B.A. Huber) . 1♂, ZFMK (Ar 19651), km 102 from El Dorado (6°04’N, 61°24’W), ~ 500 m a.s.l., near ground, 2.xii.2002 (B.A. Huber).

Description (amendments; see Huber 2000). Tibia 1 in four newly examined males: 14.5, 14.9, 16.0, 16.4; in two females: 10.8, 10.9. Tibia 1 L/d in two males: 78, 81; male leg femora 3 of different color (pale yellowish in ethanol rather than brown to black) and much wider than other femora (diameters femora 1–4 in one male: 0.21, 0.22, 0.41, 0.21). Male palpal trochanter with indistinct ventral hump (not with finger-shaped apophysis as in M. aurantiacus and M. spinosus ). In most females, the distinctive median sclerotized sac(?) in the internal female genitalia (cf. Huber 2000: fig. 800) is clearly visible through the cuticle.

Distribution. Widely distributed, ranging from northeastern Brazil (Amapá) to eastern Venezuela ( Fig. 725 ).

Figures

FIGURES96–103.Left procursi, prolateraland retrolateral views.96–97.Mesabolivar macushi sp.n.(ZFMK Ar 18962).98– 99. M. aurantiacus (Mello-Leitão, 1930) (ZFMK Ar 18963). 100–101. M. cyaneus (Taczanowski, 1874) (ZFMK Ar 18989). 102–103.M.spinosus (González-Sponga, 2005) (MIZA MAGS 1176). Scale line:0.5 (all at same scale).

FIGURES 104–114. Left bulbal processes, dorsal and prolatero-ventral views (104–111), epigynum, ventral and lateral views (112–113), andcleared female genitalia,dorsal view (114). 104–105.Mesabolivar macushi sp. n. (ZFMK Ar 18962).106–107. M. aurantiacus (Mello-Leitão, 1930) (ZFMK Ar 18963). 108–109. M.cyaneus (Taczanowski, 1874) (ZFMK Ar 18989). 110– 114.M.spinosus (González-Sponga, 2005) (MIZA MAGS 1176). Scale lines: 0.5 (all bubal processes at same scale).

FIGURES 724–725. Known distribution of the Mesabolivar aurantiacus ‘group’.TL, type locality.