First record and revised description of Herpetocypris helenae G. W. Müller, 1908 from the Neotropics (central-west Argentina)

Abstract

The genus Herpetocypris Brady & Norman, 1889 has a wide distribution in mostof the zoogeographical regions except in the Neotropical Region, where only threespecies have so far been found ? these being H. reptans (Baird, 1835), H. chevreuxi(Sars, 1895) and H. pectinata Brehm, 1934. We here report the first record of Herpetocyprishelenae G. W. Müller, 1908 from the Neotropical Region, and provide acomplete revised description and illustration of the valves and soft parts of thisspecies, as well as information on ecological factors affecting its distribution andaspects of morphological variability of its valves.