A morphological description is provided for Amnicola limosa (Say) (Gastropoda: Hydrobiidae), type-species for the genus. The group consisting of Amnicola and several European genera is retained in the Amnicolinae Tryon, 1866, based on shared distinctive aspects of reproductive biology. Subfamilial affinities probably lie with Hydrobiidae: Emmericiinae and/or Bithyniidae, the only other rissoacean groups having tubular glands in the penis.
Holsingeria unthanksensis n. gen., n. sp., an eastern North American aquatic cavesnail (Gastropoda: Hydrobiidae) representing a monotypic genus, is described. Diagnostic features of the genus include minute, turriform-aciculate shell with apical microsculpture of low tubercles; keel-like ventral peg of opereulum; blind, unpigmented animal; reduced ctenidium; simple penis; capsule gland with ventral channel; and two sperm pouches. Affinities of this highly distinctive form lie with Phreatodrobia Hershler & Longley 1986 from southwest Texas, and/or with a number of eastern European cavesnail genera.
Resultats de tests de laboratoire sur la convenance de neuf poissons en tant qu'hote pour des glochidia de L. higginsi
