The nymph of Anisagrion Selys 1876, based on the discovery of A. inornatum (Selys, 1876) in Ecuador (Odonata: Coenagrionidae)

Abstract

The final instar nymph of Anisagrion inornatum is described and illustrated based on five specimens (one reared) from southern Ecuador. It is the first to be discovered for the genus. The nymph of Anisagrion inornatum differs from its closest relative, Apanisagrion lais, by: (1) antenna shorter in relation to head length (ratio 1.35 in An. inornatum vs 1.55 in Ap. lais); (2) fewer palpal and premental setae (5 palpal and 4 or 5 premental setae in An. inornatum vs 6–8 palpal and 5–8 premental setae in Ap. lais); (3) venter of S3–S8 with medial dark stripe. The nymphs were found in a slow shallow seep overgrown with emergent wetland plants.