Navegando por Autor "Cizauskas, Igor"

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Artigo
A New Genus of Prodidominae Cave Spider from a Paleoburrow and Ferruginous Caves in Brazil (Araneae: Prodidomidae)
(2024-08-05) Cizauskas, Igor; Zampaulo, Robson de A.; Brescovit, Antonio D.
A new monotypic genus of Prodidominae, Paleotoca gen. n., is proposed to include one cave species collected in a paleoburrow and ferruginous caves from Quadrilátero Ferrífero, Minas Gerais, Brazil: Paleotoca diminas sp. n. (♂♀). The new genus is closely related to other Neotropical Prodidominae by sharing the classic claw tuft clasper. Paleotoca gen. n. is diagnosed by the absence of a dorsal abdominal scutum, a ventral parallel rows of strong spines on the tibia and metatarsus I–II, a lack of a conductor, a discrete median apophysis on the bulb and a bifid retrolateral tibial apophysis in the male palp, a posterior extension that is beak-shaped, and folds of a copulatory duct ventrally visible in the female epigyne. Like other Prodidominae species from caves, P. diminas sp. n. is a troglobitic spider with morphological characteristics that indicate specialization to live in subterranean environments, including reduction in cuticular pigments, eye loss, heavy spination and trichobothria.
Artigo
Four new species of the genus Ochyrocera (Araneae, Ochyroceratidae) from iron caves of the state of Minas Gerais, with the description of the third anophtalmic species from Brazil
(2021-12-10) Brescovit, Antonio Domingos; Zampaulo, Robson de Almeida; Pedroso, Leandro Mota; Cizauskas, Igor
Four new species of the spider genus Ochyrocera Fage, 1912 are described from iron caves in the state of Minas Gerais, Brazil. Here we present the third anophtalmic and depigmented species of the genus, O. dorinha sp. nov., and three other depigmented species: O. monica sp. nov., O. magali sp. nov. and O. rosinha sp. nov. Only O. dorinha sp. nov. and O. rosinha sp. nov. are considered as troglobites due the ocular reduction or anophthalmia and elongated appendages, two troglomorphic features absent in the other species described.
Artigo
A new genus of Micromygalinae (Araneae, Microstigmatidae) from Brazil, with transfer of Masteria emboaba Pedroso, Baptista & Bertani, 2015 and description of six new species
(2019-01-08) Passanha, Victor; Cizauskas, Igor; Brescovit, Antonio
The family Microstigmatidae is composed of two subfamilies, Microstigmatinae and Micromygalinae, seven genera and 16 species. Micromygalinae is monotypic, comprising the species Micromygale diblemma Platnick & Forster, 1982 from Panama. A new genus, Tonton is described as a new member of the Micromygalinae. Masteria emboaba Pedroso, Baptista & Bertani, 2015, is transferred to the new genus and six new species from Brazil are described and attributed to Tonton gen. n.: the type species, T. itabirito sp. n., T. queca sp. n., T. matodentro sp. n. and T. sapalo sp. n., all from the state of Minas Gerais; T. ipiau sp. n. from the state of Bahia and T. quiteria sp. n. from the state of Maranhão. Among the cavernicolous species, only T. itabirito sp. n. is considered troglobitic by the total absence of eyes.
Artigo
The first two blind troglobitic spiders of the genus Ochyrocera from caves in Floresta Nacional de Carajás, state of Pará, Brazil (Araneae, Ochyroceratidae)
(2021-04-15) D. Brescovit, Antonio; de A. Zampaulo, Robson; Cizauskas, Igor
The first two anophthalmic species of spiders of the genus Ochyrocera Simon, 1892, are described for caves located in the iron formation of Floresta Nacional (FLONA) de Carajás in southeastern Pará State, Brazil. The caves are located in the municipalities of Parauapebas and Canaã dos Carajás, in the eastern portion of the Amazon Forest domain. Ochyrocera ritxocosp. nov. and O. ritxoosp. nov. are described based on males and females. The species have similar body characteristics with the total absence of eyes and complete depigmentation, characteristics that indicate possible evolution in subterranean environments , and thus are classified as troglobites. Each species is associated with a single geomorphological unit (mountain range), with Ochyrocera ritxocosp. nov. being restricted to caves of Serra Norte (North Mountain) and O. ritxoosp. nov. to caves of Serra Sul (South Mountain). Both species were collected in aphotic zones of the caves. Small and tangled webs of O. ritxocosp. nov. were observed under blocks of stone in the soil or in cracks of the walls.
Artigo
Three new species of the genus Speocera (Araneae: Ochyroceratidae) from caves of the state of Minas Gerais, Brazil
(2023-10-20) Brescovit, Antonio ; Zampaulo, Robson de Almeida ; Pedroso, Leandro; Cizauskas, Igor
Three new species of the spider genus Speocera Berland, 1914 are described from caves of different lithologies, in the state of Minas Gerais, Brazil: Speocera canjica n. sp., S. pamonha n. sp. and S. vacaatolada n. sp., all based on males and females. Among the described species, S. vacaatolada n. sp., presents a palp morphology similar to that of Speocera pallida, where a reduction of bulb structures occurs.