Hydraena (Dnahydnaedna)

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 16-17

Hydraena (Dnahydnaedna) , new subgenus

Type species: Hydraena paeminosa Perkins, 1980 .

Description. With the following combination of characteristics: Moderately large to large adults (ca. 1.60–1.96 mm), coarsely punctate, elytral punctures random, and habitus characteristic, with pronotum rather elongate. Ventrally, gena with posterior ridge, and mesoventral intercoxal process (P2) tapering to sharp point that is contiguous with a median carina of the metaventrite; male genitalia are usually quite tubular, and have a basic plan similarity; the parameres are characteristic, the left paramere is very small, and located toward the distal end of the main piece, whereas the right paramere has been lost, the paramere setae having their sockets on the main piece. Female gonocoxite "divided," having a weakly sclerotized midlongitudinal area. Spermatheca circular, somewhat disc-shaped. (See figures 3–14, 148, 153– 157 in Perkins 2011)

The six species of the H. paeminosa group are presently included in H. (Dnahydnaedna): H. paeminosa ( Guyana, Suriname), H. boliviana ( Bolivia) , H. xingu ( Brazil) , H. duohamata ( Venezuela) , H. punctilata ( Brazil) , and H. neblina ( Venezuela) . Additional DNA sequence studies are needed to determine if species in the H. curvosa and H. multispina groups (both South American; see Perkins, 2011) are also members of Dnahydnaedna.

Etymology. Dnahydnaedna is a miscellaneous combination of letters (pronounced dee-nuh-hide-need-nuh). It is dedicated to Ignacio Ribera and Marco Trizzino in recognition of their ongoing contributions to the knowledge of Hydraenidae phylogeny, via DNA sequence analyses.