Abstract
A new species, Hyalella tepehuanasp. nov., is described from Durango state, Mexico, a region where studies on Hyalella have been few. This species differs from most species of the North and South American genus Hyalella in the number of setae on the inner plate of maxilla 1 and maxilla 2, characters it shares with Hyalella faxoni Stebbing, 1903. Nevertheless, H. faxoni, from the Volcan Barva in Costa Rica, lacks a dorsal process on pereionites 1 and 2. Also, this new species differs from other described Hyalella species in Mexico by the shape of the palp on maxilla 1, the number of setae on the uropods, and the shape of the telson.
Highlights
Covich et al (2009) recorded seven species of the amphipod Hyalella Smith, 1874 for North America and emphasized that there were probably one or more undescribed species
Most of the studies on amphipods in northern Mexico are focused on the stygobitic environment (e.g. Holsinger 1973)
We record and formally describe for the first time an epigean amphipod, Hyalella tepehuana sp. nov., from Durango state. This new species is the first epicontinental freshwater amphipod described in the Nearctic Region of Mexico
Summary
Covich et al (2009) recorded seven species of the amphipod Hyalella Smith, 1874 for North America (including northern Mexico) and emphasized that there were probably one or more undescribed species. Coxae 1–3 (Fig. 2A, B) subequal in shape, subrectangular, longer than wide; coxa 1 shorter than coxae 2 and 3; coxa 4 wider than coxae 1–3 with a deep posterior excavation; coxae 1–4 slightly overlapping anterior coxa, distal margin rounded with small setae widely separated, acumination absent.
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