Key to the species of the Labiobaetis claudiae group (larvae)

1. Paraproct distally expanded (Fig. 4a) ………………………………………. L. stagnum J Paraproct distally not expanded (Figs 2g, 4b) …………………………………………. 2

2. Labial palp segment II with rather broad protuberance and segment III subquadrangular (Fig. 4f) ……………………………………………………………………… L. claudiae

- Labial palp segment II with narrow protuberance and segment III slightly pentagonal (Fig. 1h) ……………………………………………………… L. academicus sp. nov.

Genetics

The genetic distances (K2P) between the species of the L. claudiae group are between 20% and 23%, and therefore much higher than 3.5%, which is generally considered as a likely maximal value for intraspecific divergence (Hebert et al., 2003; Ball et al., 2005; Zhou et al., 2010) (Table 1).