Subgenus Chaetonotus sensu stricto Ehrenberg, 1830

Type species: Chaetonotus larus (Müller, 1773) Terra typica: Denmark

Clearly a polyphyletic subgenus in terms of the molecular data (Kånneby et al. 2012, 2013); encompasses 78 nominal freshwater and 4 nominal marine species. Present in benthic, interstitial, peryphytic and rarely also in semiplanktonic habitats.

A, E—Dorsal view with visible outer layer of cuticle in different specimens, B, F—Ventral view with visible outer layer of cuticle in different specimens, C, D, G, H—Variations of outer layer of cuticle in different specimens. All measurements in micrometers.