Las arañas de los oasis de la región meridional de la península de Baja California, México

A spider inventory from 4 oases at the xeric and mesic environments was undertaken. Ground and vegetation spiders were captured with pit fall traps and collected by sweeping and beating. Thirty four families, 130 genera and 243 species were captured which represent 63.2% of the species recorded for the Baja California Peninsula. One genus and 11 species are cited for the first time for Mexico, 13 genera and 18 species are new records for Baja California Sur. Salticidae (36), Araneidae (29), Theridiidae (27), and Gnaphosidae (24) families had the highest specific richness. Thirty two families, 125 genera, and 215 species are reported for the xeric environment and 26 families, 96 genera, and 157 species for the mesic environment. Both environments shared 128 species; 87 and 29 species were exclusive to xeric shrub and mesic vegetation, respectively. Complementarity between xeric and mesic environment was 47.5%. Twenty eight families, 89 genera, and 144 species, and 16 families, 45 genera and 119 species were captured in soil and vegetation strata, respectively with a complementarity of 92.2%.