Hydraena (Monomadraena) simplicata, Perkins, 2017

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 60

Hydraena (Monomadraena) simplicata Group

Four species are included in this group: H. simplicata , H. multiarcuata , H. ranomafana , and H. mahavavona . Members of this group are small to medium sized (ca. 1.44–1.75 mm), reddish dorsally, without a distinct pronotal macula. The prosternal intercoxal process (P1) is as wide as P2. The genae are raised, shining, with a posterior ridge, interrupted in midline. The metaventrite has an anteromedian carina, but it does not join with the plaques. The plaques are narrow or carinate, and vary in shape and size according to the species. Males do not have brushes of setae on the metatibiae, but two species have arcuate metatibiae. The mesotibia medial margin in males has 4–5 short sharp spines, with the margin notched between the spines.

The aedeagi have a similar general plan: the distal part of the main piece is varyingly produced on the right side, the distal piece is quite small, and the gonopore is usually located at the end of a flexible flagellum; the exception being H. mahavavona .