Ephydrolithus ogmos, Girón & Short, 2019

Giron, Jennifer C. & Short, Andrew Edward Z., 2019, Three additional new genera of acidocerine water scavenger beetles from the Guiana and Brazilian Shield regions of South America (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 855, pp. 109-154 : 127-128

Ephydrolithus ogmos sp. nov. Figs 6 A–D , 7H , 8 , 9A, B

Type material.

Holotype (♂): "BRAZIL: Bahia: Abaíra; 13.29053S, 41.90489W; 1705 m; Pico do Barbado, W of Catolés; vertical seep on rock; 26.ii.2018; leg. Benetti & team; BR18-0226-01C" (INPA). Paratypes (4): BRAZIL: Bahia: Same data as holotype (SEMC, 2 including DNA voucher SLE-1510; INPA, 2).

Differential diagnosis.

Ephydrolithus ogmos is easily distinguished from all the other known species by its well-defined striae along the posterior third of the elytra.

Description.

Body length 3.1-3.3 mm, width 1.8-2.0 mm. Body elongate oval, strongly convex (Fig. 6B ). General coloration brown, slightly paler along margins of pronotum and elytra. Posterior elevation of mesoventrite with well-developed spine, forming high anterior carina. Elytra with well-developed striae along posterior half and reduced serial punctures. Pro- and mesofemora covered with hydrofuge pubescence along basal half; metafemora with glabrous tibial grooves. Apex of fifth abdominal ventrite truncate. Aedeagus (Fig. 7H ) with basal piece 0.7 × the length of parameres; parameres nearly 0.7 × greatest width of median lobe, with outer margins slightly sinuate; apex of parameres rounded, obliquely directed; apex of median lobe widely acute.

Etymology.

Named with the Greek word ogmos meaning furrow, in reference to the well-defined elytral striae of the species.

Distribution.

Only known from the type locality, Pico do Barbado (Fig. 8 ).

Life history.

The type series was collected on a high-elevation seepage over a vertical cliff. The rock face had moss and algal growth on same areas (Figs 9A, B ).

Figures

Figure 6. Habitus of Ephydrolithus spp.: A-D Ephydrolithus ogmos: A dorsal view B lateral view C ventral view D head, dorsal view. E-H Ephydrolithus minor: E dorsal view F lateral view G ventral view H head, dorsal view. Scale bars: 1 mm.

Figure 7. Thorax, abdomen and genitalia of Ephydrolithus spp.: A-D Ephydrolithus hamadae: A ventral view of mesoventrite (white arrow pointing transverse ridge) B posterior view of metafurca C fifth abdominal ventrite D aedeagus E aedeagus of Ephydrolithus teli. F, G Ephydrolithus spiculatus: F aedeagus G oblique view of mesoventrite (black arrow pointing well-developed tooth) H aedeagus of Ephydrolithus ogmos I aedeagus of Ephydrolithus minor. Scale bars: 0.25 mm.

Figure 8. Distribution of Ephydrolithus spp.

Figure 9. Habitat of Ephydrolithus spp. A, B habitat and type locality for E. minor and E. ogmos, Brazil, Pico do Barbado, collecting event BR 18 - 0226 - 01 C C habitat and type locality for E. hamadae and E. spiculatus, Brazil, Cachoeira da Palmeira, collecting event BR 18 - 0302 - 04 A D habitat and type locality for E. teli, Brazil, Pico do Barbado, collecting event BR 18 - 0226 - 01 B.