Corynosoma Lühe, 1904

Genus Corynosoma Lühe, 1904 View in CoL

The morphology of all three species conformed to the generic diagnosis of Corynosoma according to Lühe ( 1904, 1911), Van Cleave (1953), Arai (1989) and Aznar et al. (2006). The genus is characterized by a small body size, comprising a clubbed fore-trunk and a cylindrical hind-trunk. Trunk spines on the anterior and ventral surface of the fore-trunk. Neck trapezoid, short and spineless; can be retracted into fore-trunk. Proboscis subcylindrical, enlarged midway along its length or just posterior to the midpoint. Proboscis hooks arranged in longitudinal rows. Posterior 3–5 hooks in a longitudinal row without roots; all other hooks with simple, unbranched roots. Largest hooks occur on broadest part of proboscis. Proboscis receptacle double-walled. Lemnisci shorter than proboscis receptacle, broad and leaf-like. Gonopore terminal or slightly subterminal in both genders. Male reproductive system either confined to the hind-trunk or extending into posterior part of fore-trunk. Paired testes elongate-oval, partially overlapping. Six pyriform cement glands. Eggs fusiform, with relatively short polar prolongations of the thickened shell membrane, filling body cavity of gravid females. Gonopore of female sometimes covered by a copulatory cap.