MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
Description of a new species of the genus Zimiromus from Argentina (Araneae: Gnaphosidae)
ZAPATA, LORENA V.; GRISMADO, CRISTIAN J.
Lugar: Auckland; Año: 2012 vol. 3317 p. 65 - 65
The Neotropical genus Zimiromus Banks, 1914 was first revised by Platnick & Shadab (1976) and comprised at that time21 species distributed from Mexico to Brazil. It was diagnosed by the combined presence of a strongly procurvedposterior eye row (Figs. 5, 6), dentate tarsal claws, tarsi without false articulations, three promarginal cheliceral teeth, themale palp with a hook-like median apophysis, and the female epigynum usually with a scape (Platnick & Shadab 1976:4). Subsequent contributions (Platnick & Shadab 1979, 1981, Platnick & Höfer 1990, Buckup & Brescovit 1993,Brescovit & Höfer 1994, Brescovit & Buckup 1998, Brescovit et al 2008) showed that the genus is more diverse; thecurrent number of recognized species is 40 (Platnick 2012). This genus was traditionally assigned to the subfamilyEcheminae (Platnick 1990) or, at least, considered related to the genus Echemus Simon (Murphy, 2007).Platnick & Shadab (1976) divided the genus in three informal groups, although these authors pointed out that thereare still no evidences of monophyly of these preliminary groupings. One of these, the tropicalis group, share anapparently autapomorphic character, a striated epigynal scape, while all of the known males assigned to that group havea bifid retrolateral tibial apophysis with a long dorsal prong (Platnick & Shadab 1976, figs. 6, 7), and all except Z. medius(Keyserling) have a distinct ledgelike distal dilation of the palpal femur.To date, no Zimiromus species have been reported from Argentina. In a recent survey of the spider fauna fromCostanera Sur Ecological Reserve, in Buenos Aires city, several specimens of this genus were collected under deadleaves of pampas grasses (Cortaderia selloana), near the margin of a coastal lagoon. The examination of the specimensshows that they do not belong to any of the previously described species, and share all the above mentioned characters ofthe tropicalis group. In this contribution we describe and illustrate this new species, the first one known from theArgentine fauna.