Description of two new epigean species of the genus Hyalella S.I. Smith, 1874 (Crustacea: Amphipoda: Hyalellidae) from Jalisco, Mexico

Two new species of Hyalella S.I. Smith, 1874 are described from state Jalisco, Mexico. marysolae sp. nov. can be identified by the presence small projections or carinae on pleonites 1−2, with first antenna being composed 12 articles and second 15 articles. The maxilla bearing 2−3 distal pappose setae, propodus in male gnathopod is hammer-shaped. Conversely, H. morronei nov., dorsal absent 10 14 always bears two hatchet-shaped. Both distinguishable other found Mexico antenna. In these species, approximately half as long total body length, peduncle comprises −15 articles; whereas, Mexican it shorter maximum Here, we add to four previously necessary increase knowledge alpha taxonomy this group crustaceans compensate for biodiversity genus underestimated.