Mesabolivar brasiliensis ( Moenkhaus, 1898 )

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: 69-71

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-C630-FFC3-2A9C-9808300F7BC9

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scientific name

Mesabolivar brasiliensis ( Moenkhaus, 1898 )
status

 

Mesabolivar brasiliensis ( Moenkhaus, 1898) 

Figs 274–279View FIGURES 271–279, 298–299View FIGURES 292–305

Litoporus brasiliensis Moenkhaus, 1898: 110  , pl. 5, figs 6, 6a–c (♂, Brazil: São Paulo). Mello-Leitão 1918: 95, figs 5–6 (copy of Moenkhaus 1898).

Blechroscelis viridis Mello-Leitão, 1918: 105  , figs 19–20 (♂, Brazil: Rio de Janeiro). Mello-Leitão 1947c: 2 (dubious record, see Notes below). Synonymized in Huber 2000: 217.

Mesabolivar brasiliensis: Huber 2000: 217  , figs 843–850 (Brazil: São Paulo, Rio de Janeiro, Paraná). Ramalho et al. 2008: 454 (São Paulo). Huber & Rheims 2011: 281 (São Paulo, Rio de Janeiro). Castanheira et al. 2016: 13 (Rio de Janeiro).

Diagnosis. Distinguished from similar congeners ( M. kathrinae  , M. azureus  , M. pallens  ) by shape of procursus ( Figs 274–279View FIGURES 271–279; without distal spine-like process; bent rather than evenly curved as in M. azureus  ; with widened rather than slender tip as in M. kathrinae  and M. pallens  ); from M. kathrinae  also by male chelicerae (Huber 2000: fig. 843; distal apophyses in more distal position; presence of indistinct proximal processes) and by epigynum with median pocket (pocket absent in M. kathrinae  ). Females of M. brasiliensis  , M. pallens  , and M. azureus  may be indistinguishable externally ( Figs 292, 294, 298–299View FIGURES 292–305).

Type material. Litoporus brasiliensis Moenkhaus, 1898  : BRAZIL: São Paulo: ♂ lectotype, 1♀ paralectotype (designated in Huber 2000), MZSPAbout MZSP, Poço Grande, “margem do Rio Juquiá” [23.756°S, 46.667°W], i.1898 (W. Moenkhaus), examined (Huber 2000).

Blechroscelis viridis Mello-Leitão, 1918  : BRAZIL: Rio de Janeiro: 3♂ syntypes, MNRJAbout MNRJ, Pinheiro [22.52°S, 44.00°W], no further data, examined (Huber 2000).GoogleMaps 

New records. BRAZIL: São Paulo: 2♂ 3♀ 1 juv., ZFMKAbout ZFMK (Ar 19105), Ubatuba, Fazenda Angelim (23.394°S, 45.063°W), 16–18.xii.2003 (B.A. Huber); 1♂ in pure ethanol, ZFMKAbout ZFMK (Br03/100-7), same data. 1♂ 1♀, ZFMKAbout ZFMK (Ar 19106), São Paulo City, Parque Estadual de Cantareira (23.417°S, 46.617°W), 20.xii.2003 (B.A. Huber); 1♂ 1♀ in pure ethanol, ZFMKAbout ZFMK (Br03/100-16), same data. 5♂ 4♀ in pure ethanol, ZFMKAbout ZFMK (G002), São Paulo City, Parque Estadual de Cantareira, 28.vi.2001 (R. Pinto da Rocha, C. Rheims).

Rio de Janeiro: 3♂, ZFMKAbout ZFMK ( Ar 19107–08), Reserva Ecológica Rio das Pedras (22°59.5’S, 44°06.0’–06.8’W), 50–200 m a.s.l., 26.ix.2009 (B.A. Huber, A. Giupponi)  . 3♂ 1♀, ZFMKAbout ZFMK (Ar 19109), Cachoeira da Pedra Branca near Paraty (23°11.8’S, 44°46.0’W), forest near river, ~ 230 m a.s.l., 22.viii.2007 (B.A. Huber).GoogleMaps 

Assigned tentatively (see Notes below). BRAZIL: Rio de Janeiro: 4♂ 3♀, ZFMKAbout ZFMK ( Ar 19110), Cachoeiras de Macacu, Reserva Ecológica de Guapiaçú (22°24.4’–25.3’S, 42°44.2’–44.3’W), 140–300 m a.s.l., 25.ix.2009 (B.A. Huber)  ; 3♀, ZFMKAbout ZFMK ( Ar 19111), same locality at 140–280 m a.s.l., 23.ix.2009 (B.A. Huber, A. Giupponi)  . 1♂ 7♀, ZFMKAbout ZFMK (Ar 19112), Reserva Ecológica Rio das Pedras (22°59.5’S, 44°06.0’W), 50 m a.s.l., 25.ix.2009 (B.A. Huber)GoogleMaps  ; 6♂ 4♀, ZFMKAbout ZFMK ( Ar 19113–14), same locality at 50–200 m a.s.l. (22°59.5’S, 44°06.0’–06.8’W), 26.ix.2009 (B.A. Huber, A. Giupponi)GoogleMaps  ; 3♂ in pure ethanol, ZFMKAbout ZFMK ( Br 09-113), same locality, 25–26.ix.2009 (B.A. Huber)GoogleMaps  . 4♂ 3♀, MNRJAbout MNRJ (14317), Reserva Ecológica Rio das Pedras (22°59.5’S, 44°06.0’–06.8’W), 50–200 m a.s.l., night, 25.ix.2009 (A. Giupponi, A. Kury)  ; 1♀, MNRJAbout MNRJ (14318), same data but day  . 4♂ 2♀ 2 juvs, ZFMKAbout ZFMK (Ar 19115), ~ 3.5 km NW Paraty (23°11.5’S, 44°43.9’W), degraded forest, ~ 50 m a.s.l., 21.viii.2007 (B.A. Huber)GoogleMaps  ; 1♂ 1♀ in pure ethanol, ZFMKAbout ZFMK (Br 07/100-19), same dataGoogleMaps  . 4♂ 1♀ 2 juvs, ZFMKAbout ZFMK (Ar 19116), Cachoeira da Pedra Branca near Paraty (23°11.8’S, 44°46.0’W), forest near river, ~ 230 m a.s.l., 22.viii.2007 (B.A. Huber)GoogleMaps  . 1♀ in pure ethanol, ZFMKAbout ZFMK (G005), Itatiaia [22.496°S, 44.561°W], 8–15.vi.2001 (H.F. Japyassú).GoogleMaps 

Description (amendments; see Huber 2000). Tibia 1 in 32 newly examined males: 8.8–13.1 (mean 11.3); in 30 newly examined females: 6.8–10.4 (mean 8.7). Male femora 2 usually wider than other femora, especially distal thirds. Femora significantly longer than tibiae (e.g., male tibia 1 length 83% of femur 1 length). Prolateral trichobothrium present on tibia 1. Tip of procursus variable, possibly indicating presence of more than one species ( Figs 274–279View FIGURES 271–279; see Notes below). Proximal processes on male chelicerae sometimes distinct, sometimes barely visible in dissecting microscope. Female femora all about same diameter. Epigynum slightly variable in size and shape, depending on degree of sclerotization of anterior plate and on distinctness of internal ‘valve’ visible through cuticle.

Natural history. The spiders were found in domed webs freely suspended among the vegetation, mostly ~ 0.5– 1 m above the ground. The webs seemed to consist of two sheets: a domed upper sheet where the spider rested (diameter ~ 20 cm), with a tangle of silk lines above the dome, and a lower rather flat sheet slightly below the dome.

Distribution. Widely distributed from eastern Paraná state to Rio de Janeiro state, Brazil ( Fig. 731View FIGURES 730–731) (but see Notes below).

Notes. As already noted previously (Huber 2000), two species might be included: the ‘true’ M. brasiliensis  with a procursus as shown in Figs 274–276View FIGURES 271–279 (slender, with distinct dorsal widening), and a possible second species with a procursus as shown in Figs 277–279View FIGURES 271–279. The male chelicerae and the epigyna do not seem to differ between these two ‘morphs’ or ‘species’.

‘True’ M. brasiliensis  also seem to have a consistently shorter abdomen and shorter legs. Tibia 1 length in ten males of ‘true’ M. brasiliensis  : 8.8–11.5 (mean 9.9); in 22 males of the possible second species: 10.8–13.1 (mean 11.8). Tibia 1 length in seven females of ‘true’ M. brasiliensis  : 6.8–8.1 (mean 7.6); in 23 females of the possible second species: 8.0–10.4 (mean 9.0).

Geographically, the ‘true’ M. brasiliensis  is more southern, the possible second species more northern, but there is considerable overlap in southern Rio de Janeiro state, where both ‘morphs’ or ‘species’ were found to even share localities (Reserva Ecológica Rio das Pedras, Cachoeira da Pedra Branca near Paraty).

The species is not formally split here because I have not (re)examined all material available in collections. Ideally, a much denser sampling combined with molecular species delimitation methods should be done before splitting (or not splitting) this species.

Mello-Leitão (1947c) reported the species (under Blechroscelis viridis  ) from Minas Gerais, Carmo do Rio Claro. I have not seen his specimens (not specified) but consider the record dubious because of the distance to confirmed records. Ramalho et al. (2008) reported the species from “Estação Ecológica de Boracéia (22°11’S, 48°46’W), Salesópolis” but give wrong coordinates (of the town Boracéia: 22.18°S, 48.77°W; instead of the Ecological Station near Salesópolis: ~23.63°S, 45.83°W).

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Mesabolivar

Loc

Mesabolivar brasiliensis ( Moenkhaus, 1898 )

Huber, Bernhard A. 2018

2018
Loc

Litoporus brasiliensis

Moenkhaus, 1898 : 110

Loc

Blechroscelis viridis Mello-Leitão, 1918: 105

Mello-Leitão 1947c : 2