Stenochironomus, Kieffer, 1919

Epler, John H., 2017, AN ANNOTATED PRELIMINARY LIST OF THE CHIRONOMIDAE (DIPTERA) OF ZURQUÍ, COSTA RICA Abstract Introduction, CHIRONOMUS Journal of Chironomidae Research 30 (30), pp. 4-18 : 11

Stenochironomus

- Ten species of Stenochironomus were collected, only one of which was positively identified as a previously described species: S. nudipupa is known from Brazil, Costa Rica, Ecuador and Venezuela ( Borkent 1984; Reis et al. 2013). A single specimen of S. cf. varius appears to be S. varius but lacks any coloration on its fore femur; it does have a darkened fore coxa and trochanter, and may represent a slight color variation of the species. Since Borkent’s (1984) excellent revision of Stenochironomus and its allies, numerous additional species have been described from the Neotropics; Dantas et al. (2016) provided the most recent key for Neotropical Stenochironomus . Stenochironomus sp. ZUR–1 (six specimens) is similar to S. impendens Borkent , but has a different abdominal color pattern; S. sp. ZUR–2 (one specimen) has a dark, broad anal point, but has different thoracic and abdominal color patterns from any described species; S. sp. ZUR–3 (16 specimens) will key to S. sebastiao Andersen et al. ( Andersen et al. 2008) in Dantas et al. (2016) but has a shorter, thicker superior volsella and other hypopygial differences; S. sp. ZUR–4 (five specimens) and S. sp. ZUR–5 (one specimen) somewhat resemble S. leptopus (Kieffer) but differ in coloration and genitalic structures; S. sp. ZUR–6 (two specimens) is entirely pale like S. palliaculeatus Borkent , but has a stouter superior volsella; S. sp. ZUR-7 (two specimens) has an dark thorax like S. varius , but has numerous darkened abdominal tergites; and S. sp. ZUR–8 (two specimens) is unusual in having a globose/semi-pediform superior volsella.