Abstract

The monotypic genus Diminutella gen. n. is proposed to include the type species, Diminutella cortina sp. n., described from San Diego de los Baños, based on male and female specimens. This species is amongst the smallest Sparianthinae known to date reaching only 4.4 mm body length. It can be distinguished from other Sparianthinae by the combination of eye arrangement, with anterior eye row recurved, posterior eye row straight, spination pattern of legs I–II, with three ventral pairs on tibiae and one on metatarsi, and by the peculiar genitalia, with male palps bearing a large, laminar, layered conductor that rests within a retrolateral depression in the cymbium, and a female vulva with long copulatory ducts coiled around the stalk of a globose blind ending appendage.

Highlights

  • Sparianthinae Simon, 1897 is a well-established subfamily of Sparassidae Bertkau, 1872, characterized by the presence of a trilobate membrane with small or inconspicuous median lobe on metatarsi I–IV, small retromarginal denticles on the chelicerae and a median apophysis on the male palps (Jäger 1998, Ramírez 2014)

  • The subfamily occurs worldwide, but the Neotropical region is rich in terms of Sparianthinae fauna and recent papers (Rheims 2013, 2017, Rheims and Alayón 2014, 2016) show that the number of new species and genera is growing as its systematics is studied

  • Eight genera and 54 species are known from the region: Decaphora (5 species), Defectrix (1 species), Neostasina (27 species), Pseudosparianthis (8 species), Sampaiosia (1 species), Sparianthis (1 species) Stasina (4 species) and Uaiuara (7 species) (World Spider Catalog 2018)

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Summary

Introduction

Sparianthinae Simon, 1897 is a well-established subfamily of Sparassidae Bertkau, 1872, characterized by the presence of a trilobate membrane with small or inconspicuous median lobe on metatarsi I–IV, small retromarginal denticles on the chelicerae and a median apophysis on the male palps (Jäger 1998, Ramírez 2014).

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