Mesabolivar cyaneomaculatus ( Keyserling, 1891 )

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 : 59-60

publication ID

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

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.5950556

persistent identifier

https://treatment.plazi.org/id/160AC713-C64E-FFBE-2A9C-9866319D7E46

treatment provided by

Plazi

scientific name

Mesabolivar cyaneomaculatus ( Keyserling, 1891 )
status

 

Mesabolivar cyaneomaculatus ( Keyserling, 1891) View in CoL

Figs 148–149 View FIGURES 138–149 , 227–232 View FIGURES 227–240 , 250 View FIGURES241–252

Pholcus View in CoL cyaneo-maculatus Keyserling, 1891: 173, pl. 5, figs 119 a–d (♂♀, Brazil: Rio de Janeiro).

Blechroscelis cyaneo-maculatus/-a: Moenkhaus 1898: 100 –101. Mello-Leitão 1918: 107–108, figs 22–23. (Both authors just translated Keyserling’s original description, Mello-Leitão also copied Keyserling’s figures; both without adding new data).

Psilochorus cyaneomaculatus: Mello-Leitão 1947c: 2 (Brazil: Minas Gerais).

Mesabolivar cyaneomaculatus: Huber 2000: 210 View in CoL , figs 811–819 (Brazil: Rio de Janeiro). Machado 2007: 81 (Brazil: Minas Gerais, São Paulo). Huber & Rheims 2011: 281 (Brazil: Rio de Janeiro, São Paulo).

Probable and certain misidentifications (see Notes below)

Psilochorus cyaneomaculatus: Mello-Leitão 1943: 155 (Brazil: Pernambuco, Rio Grande do Sul). Blechroscelis cyaneo-maculatus: Mello-Leitão 1947b: 233 (Brazil: Paraná). Mesabolivar cyaneomaculatus: Huber 2015: 57 View in CoL (Brazil: Espírito Santo).

Notes. I have not seen Mello-Leitão’s (1943, 1947b) specimens from Paraná, Rio Grande do Sul, and Pernambuco, but consider these records dubious. Extensive recent collections along the entire Brazilian Atlantic Forest from Rio Grande do Sul to Rio Grande do Norte do not include M. cyaneomaculatus View in CoL outside Rio de Janeiro and São Paulo states. In particular, Rio Grande do Sul and Pernambuco are far from the confirmed range of this species. The Paraná records might be valid but need confirmation. The Minas Gerais record in Mello-Leitão (1947c) receives some support from Machado’s (2007) record from this state. Finally, my own previous record from Espírito Santo (Huber 2015) is based on two females (ZFMK, Ar 19073, Br10-83) that are very similar to M. cyaneomaculatus View in CoL but have lower epigynal processes in a more anterior position; they probably represent a different, undescribed species.

Diagnosis. Distinguished from most known congeners by armature of male chelicerae (Huber 2000: fig. 812; one pair of frontal apophyses near median line), shape of procursus (Huber 2000: figs 813–816, Figs 227–229 View FIGURES 227–240 ; widely curved, distinctive distal structures), and shape of epigynum (Huber 2000: figs 817–818, Figs 230–232 View FIGURES 227–240 ; trapezoidal anterior plate with pair of apophyses and median pocket); from the very similar M. claricae by longer and more slender procursus with different distal elements (compare Figs 227–229 and 233–235 View FIGURES 227–240 ), and by larger epigynum (width>0.9, vs. <0.8 in M. claricae ) with anterior pair of low humps (compare Figs 230–232 and 236– 237 View FIGURES 227–240 ).

Type material. BRAZIL: Rio de Janeiro: 1♂ 1♀ syntypes, BMNH (1890.7.1.8325–7), Rio de Janeiro City(?), no further locality data, leg. E.A. Göldi, examined (Huber 2000).

New records. BRAZIL: Rio de Janeiro: 6♂ 3♀ 1 juv., ZFMK (Ar 19074–77), ~ 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) ; 1♂ 1♀ in pure ethanol, ZFMK (Br 07/100-6, Br 07/100-43), same data . 4♂ 1♀, ZFMK (Ar 19078), 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, ZFMK (Br 09-107), Reserva Ecológica Rio das Pedras (22°59.5’S, 44°06.0’–06.8’W), 50–200 m a.s.l., 25–26.ix.2009 (B.A. Huber) . 1♀ in pure ethanol, ZFMK (G007), Itatiaia [22.45°S, 44.59°W], 8–15.vi.2001 (H. Japyassú). GoogleMaps

São Paulo: 3♂ 4♀ 3 juvs, ZFMK (Ar 19079), Paranapiacaba, Estação Biológica do Alto da Serra (23°46.7’S, 46°18.6’W) 14–15.xii.2003 (B.A. Huber) GoogleMaps ; 2♂ 2♀ in pure ethanol, ZFMK (Br 03/100-21), same data GoogleMaps . 3♀, ZFMK ( Ar 19080), Ubatuba, Fazenda Angelim (22°36.9’S, 52°17.9’W), 16–18.xii.2003 (B.A. Huber) GoogleMaps . 1♂, ZFMK (Ar 19081), São Paulo, Parque Estadual de Cantareira (23.417°S, 46.617°W), 20.xii.2003 (B.A. Huber) GoogleMaps ; 1♂ in pure ethanol, ZFMK (Br 03/100-14a), same data GoogleMaps .

Description (amendments; see Huber 2000). Tibia 1 in nine newly examined males: 13.1–17.7 (mean 15.6); in 11 newly examined females: 10.4–13.7 (mean 12.2). Male tibia 2/tibia 4 length (N=2): 1.05, 1.08. Femora 2 and 3 in some males much wider than other femora, in others barely wider. Prolateral trichobothrium present on tibia 1. Epigynal processes slightly variable (in lateral view; Figs 231–232 View FIGURES 227–240 ).

Natural history. The spiders were found in large sheltered spaces among rocks and logs, also under bridges. They built rather flat webs that seemed to have no or a very limited tangle of lines above the sheet. During the day, the spiders sat on the rock or log; when disturbed, they ran into the web and started swinging with large amplitude and high frequency.

Distribution. Widely distributed in the Brazilian states of São Paulo, Rio de Janeiro, and Minas Gerais, possibly ranging into Paraná state ( Fig. 729 View FIGURES726–729 ).

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Mesabolivar

Loc

Mesabolivar cyaneomaculatus ( Keyserling, 1891 )

Huber, Bernhard A. 2018
2018
Loc

Pholcus

Keyserling, 1891 : 173
Loc

Blechroscelis

Moenkhaus 1898 : 100
Loc

Psilochorus cyaneomaculatus: Mello-Leitão 1947c : 2

Mello-Leitão 1947c : 2
Loc

Psilochorus cyaneomaculatus: Mello-Leitão 1943 : 155

Mello-Leitão 1943 : 155
Mello-Leitão 1947b : 233
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