Underestimated diversity of hydrobiid snails. The case of Pseudamnicola (Corrosella) (Mollusca: Caenogastropoda: Hydrobiidae) Author Delicado, Diana Author Machordom, Annie Author Ramos, Marian A. text Journal of Natural History 2011 J. Nat. Hist. 2012-01-31 46 1 - 2 25 89 http://dx.doi.org/10.1080/00222933.2011.623358 journal article 10.1080/00222933.2011.623358 1464-5262 5199547 Pseudamnicola Paulucci, 1878 Type species Bithynia lucensis Issel, 1866 ( Kennard and Woodward, 1926 ), subsequent designation. Etymology The name Pseudamnicola was used to distinguish the European species formerly included in Amnicola ( Paulucci, 1878 ) . Diagnosis (new diagnosis) Shell ovate-conic, with an inflated body whorl about three-quarters of shell length and aperture complete and oval; operculum corneous, yellowish, thin, pliable, ellipsoidal, paucispiral with submarginal nucleus; ctenidium well-developed; osphradium elliptical of intermediate width; radula with central tooth having one basal cusp on each lateral margin and a basal tongue broadly V-shaped; stomach with two chambers and a thin caecum lying on ventral side of posterior chamber; one digestive gland opening in posterior chamber; renal oviduct pigmented; only one seminal receptacle arising from renal oviduct close to insertion of bursa copulatrix duct; bursa copulatrix welldeveloped protruding behind pallial oviduct; prostate gland bean-shaped and penis simple with a distal patch of pigmentation, variable in size; nervous system pigmented with supraoesophageal connective longer than suboesophageal.