Thaumastodinae, Champion, 1924

Hernando, Carles, 2023, A new flightless genus of Thaumastodinae from Australia (Coleoptera: Limnichidae), Zootaxa 5315 (6), pp. 559-566 : 563

Key to the genera of the subfamily Thaumastodinae

1. Tarsal formula 4–5–5; legs slender; antennal insertions situated near eyes; metaventrite short, not covering metacoxae; riparian habitats; Palearctic and Oriental regions............................................ Acontosceles Champion, 1924

- Tarsal formula 4–4–4; legs stout; antennal insertions situated near mandibles; metaventrite projecting posteriorly, covering metacoxae; terrestrial, riparian and intertidal habitats......................................................... 2

2. Eyes round and widely separated, distance between eyes larger than the diameter of an eye; terrestrial, not associated with riparian habitats; Australian Region ................................................... Austramastodus gen. nov.

- Eyes elongated and close together, distance between eyes always narrower than the maximum length of an eye; riparian and intertidal habitats..................................................................................... 3

3. Frons between eyes distinctly and arcuately projecting anteriad, narrow; male protarsi enlarged; riparian habitats; Palearctic, Oriental and Australian regions.................................................... Pseudeucinetus Heller, 1921

- Frons only gently projecting anteriad, wide; male protarsi not enlarged; intertidal habitats............................ 4

4. Antennae 7-segmented; genal antennal groove absent; Neotropical Region..................... Martinius Spilman, 1959

- Antennae 11-segmented; genal antennal groove present; Palearctic, Oriental, Australian/Pacific and Neotropical regions...................................................................................... Mexico Spilman, 1972