Genus Gammanema Cobb, 1920
Type species
Gammanema ferox Cobb, 1920 (junior synonym of Gammanema rapax (Ssaweljev, 1912)).
Cuticle without lateral differentiation, four slender cephalic setae; outer labia either papillose or setose. Amphideal fovea usually spiral, rarely loop-shaped.Anterior buccal cavity large, cup-shaped, surrounded by rhabdions with pointed projections at their posterior ends; posterior buccal cavity smaller, often with broad column-shaped rhabdions. Pharynx without anterior or posterior bulb. Pre-cloacal supplements present, usually cup-shaped, rarely setose or tubular. Short conical tail.
Gammanema paramenzeli (Allgén, 1935) was considered doubtful by Gerlach (1964), Trogolaimus uniformis Cobb, 1920 was transferred to Gammanema by Tchesunov & Okhlopkov (2006) and G. fennicum Gerlach, 1953 was re-established as a valid species by Okhlopkov (2002).
*approximate values only since no anus was observed in female specimens
G. anthostoma Okhlopkov, 2002
G. cancellatum Gerlach, 1955
G. curvata Gagarin & Klerman, 2007
G. conicauda Gerlach, 1953
G. fennicum Gerlach, 1953
G. kosswigi Gerlach, 1964
G. mediterraneum Vitiello, 1970
G. polydonta Murphy, 1965
G. rapax (Ssaweljev, 1912)
G. smithi Murphy, 1964
G. tchesunovi Gagarin & Klerman, 2007
G. uniformis (Cobb, 1920)