Figure: 244

In addition to the Ecdyonurinae characteristics, the following combination of characteristics will identify the genus:

Larval Diagnosis

We do not know of any unique diagnostic characters for larvae of Thamnodontus. They can be identified, however, by the combination of having simple setae on the ventral surface of the maxillae (as in Fig. 49), only one row of long, fine setae on the mid- and hindtibiae, rounded supracoxal sclerites (as in Fig. 80), an unthickened anterior margin of the head capsule (as in Fig. 34), no dorsal ridge on the abdomen, tarsal claws with at least one denticle, well-developed lamellae on all gills, gills 1 with a concave anal margin (as in Fig. 88), and rounded posterolateral projections on the superlinguae. Larvae of Electrogena are similar, but the two genera are not sympatric.

Adult Diagnosis

Adults of Thamnodontus have anteriorly expanded head capsules, as is found in Notacanthurus. The two genera are not sympatric except in Korea. The Korean species of Notacanthurus is not known in the adult stage, so differentiating characters cannot be provided at this time.


Palearctic in far eastern Russia, Korea, and Japan (Fig. 244).