AnimaliaColeopteraHydrophilidaeGirónJennifer C.ShortAndrew Edward Z.Three additional new genera of acidocerine water scavenger beetles from the Guiana and Brazilian Shield regions of South America (Coleoptera, Hydrophilidae, Acidocerinae)Zookeys136201985510915410.3897/zookeys.855.33013 Aulonochares novoairensis http://zoobank.org/F78999DD-14F1-405C-9262-DA883BDFB1F3 sp. nov.Figs 1D–F, 2F, G, 3Type material.

Holotype (♂): “BRAZIL: Amazonas: Novo Airão; 2°41'2.2878"S, 60°56'18.24"W; 60 m; detrital pools in forest along sides of blackwater creek; 9.vi.2017; leg. Benetti; BR17-0609-04B” (INPA). Paratype (1): Same data as holotype (SEMC, DNA voucher specimen SLE 1268).

Differential diagnosis.

Aulonocharesnovoairensis can be distinguished by its yellowish brown general coloration (Fig. 1D–F), and the shape of the aedeagus, which is widened at 2/3, with cylindrical median lobe (Fig. 2G).

Description.

Body length 6.3–6.9 mm, width 3.4–3.6 mm. General coloration yellowish brown (Fig. 1D–F). Aedeagus (Fig. 2G) with outer margins of parameres sinuate, widest along 2/3; median lobe cylindrical, somewhat acute at apex.

Etymology.

Named after Novo Airão municipality in the state of Amazonas in Brazil.

Distribution.

Currently only known from a single locality in the central Amazon near Manaus (Fig. 3).

Remarks.

The single collection of this species was from densely forested, shallow detrital pools immediately adjacent to a blackwater stream.

Habitus of Aulonochares spp.: A–CAulonocharestubulus: A dorsal view B lateral view C ventral view. D–FAulonocharesnovoairensis: D dorsal view E lateral view F ventral view. G–IAulonochareslingulatus: G dorsal view H lateral view I ventral view. Scale bars: 5 mm.

Head and internal structures of Aulonochares spp.: A–EAulonocharestubulus: A head, dorsal view B ventral view of mesoventrite with simply convex posterior elevation C posterior view of metafurca D fifth abdominal ventrite E aedeagus. F, GAulonocharesnovoairensis: F head, dorsal view G aedeagus. H, IAulonochareslingulatus: H head, dorsal view I aedeagus. Scale bars: 0.5 mm.

Distribution of Aulonochares spp.