Remarkable micro-endemism and high congeneric richness: eight new cave-restricted species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the Brazilian semi-arid

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  Remarkable micro-endemism and high congeneric richness: eight new cave-restricted species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the Brazilian semi-arid Abstract Eight new species of pseudoscorpions belonging to the genus Pseudochthonius Balzan, 1892 are described from the semi-arid region of Brazil. Comprehensive morphological descriptions, diagnostic characters, detailed illustrations, and ecological remarks of the habitats are provided for Pseudochthonius celestialis sp. nov., P. caritas sp. nov., P. patientia sp. nov., P. temperantia sp. nov., P. diligentia sp. nov., P. castitas sp. nov., P. humilitas sp. nov., and P. benignitas sp. nov. In addition, we present a brief discussion of the potential factors underlying the remarkable congeneric species richness observed in this geographically restricted region, as well as the principal threats faced by these species. These findings underscore the importance of conserving caves in order to pr...

Four new species of Harmonicon F. O. Pickard-Cambridge 1896 from Brazil with the first male description of H. rufescens (Araneae: Mygalomorphae: Dipluridae)

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Four new species of Harmonicon F. O. Pickard-Cambridge 1896 from Brazil with the first male description of H. rufescens (Araneae: Mygalomorphae: Dipluridae)

Abstract
Four new species of Harmonicon F. O. Pickard-Cambridge 1896 are described from the Cerrado biome of Brazil. Three new species are from Tocantins state, in the North region of Brazil: H. arraias n. sp. (♂), H. palmas n. sp. (♂♀), H. tocantins n. sp. (♂), and one new species is from Mato Grosso state, in the Central-west Brazil: H. guimaraes n. sp. (♂♀). Furthermore, we here describe for the first time the male of H. rufescens F. O. Pickard-Cambridge 1896 and expand the distribution range of this species and that of H. candango Wermelinger-Moreira, Castanheira & Baptista 2024.
Gabriel Wermelinger-Moreira, Renner Luiz Cerqueira Baptista, Four new species of Harmonicon F. O. Pickard-Cambridge 1896 from Brazil with the first male description of H. rufescens (Araneae: Mygalomorphae: Dipluridae), Acta Arachnologica, 2026, Volume 75, Issue 1, Pages 25-46, Released on J-STAGE June 07, 2026, Online ISSN 1880-7852, Print ISSN 0001-5202, https://doi.org/10.2476/asjaa.75.25, https://www.jstage.jst.go.jp/article/asjaa/75/1/75_25/_article/-char/en