Telmatogetoninae: genera

Two genera, Telmatogeton and Thalassomya, in this subfamily are known from the region: larvae and pupae live in algal mats in the intertidal maritime zone. Although some Telmatogeton species have been found in torrential streams in Hawai’i (Wirth 1947), freshwater species are not reported in any regional off-shore islands.

1 Dorsal head anterior to frontal apotome with 2 distinct sclerites, cephalic seta S3 on strong tubercle; premandible with 3 blunt teeth (Fig. 15G, H).................................................................... Telmatogeton Schiner [marine coastal, T. japonicus Tokunaga, T. pacificus Tokunaga, n.w. Pacific, China, inc. Korea, Japan (Tang et al. 2022b); 24 spp.; global]

1’ Dorsal head without distinct sclerites, seta S3 not on tubercle; premandible 1 toothed (Fig. 15I, J)..... Thalassomya Schiner [maritime coastal, T. japonica Tokunaga & Etsuko, T. maritima Wirth, n.w. Pacific, inc. Japan, Tang et al. 2022b; 10 spp.; global]