Notes and new species of the halictine genus Megommation Moure (Hymenoptera, Apidae, Augochlorini)

摘要

A new species of Megommation, M. amazonicum n. sp., is described and illustrated. An identification key for the two species of this genus is provided. Additionally, the lectotype and paralectotype of Megalopta (Megaloptella) ipomoea Schrottky are designated. The Megaloptidia group is a heterogenous group of Augochlorini taxa with strongly narrowed mouthparts and, according to Engel (2000), this is a monophyletic lineage comprising the genera Ariphanarthra Moure, Megommation s.l. Moure, Megaloptidia Cockerell, and Micrommation Moure. Engel et al. (1997) recognized four subgenera under Megommation: Cleptommation Engel, Brooks and Yanega (one species), Megaloptina Eickwort (two species), Megommation s.str. (one species), and Stilbochlora Engel, Brooksand Yanega (one species). This classification was followed by Engel (2000) and Michener (2007). However, Moure (2007) raised all these subgenera to generic status, except for the synonymy of Cleptommation under Megaloptina.