Limnebius balkei, Perkins, 2017

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 163-164

publication ID	https://doi.org/ 10.11646/zootaxa.4342.1.1
publication LSID	lsid:zoobank.org:pub:2ACD54D2-3487-432D-9323-EEC131FE2E64
DOI	https://doi.org/10.5281/zenodo.5323698
persistent identifier	https://treatment.plazi.org/id/038587BB-E3A5-FF32-FF75-F9F5BA4FFE70
treatment provided by	Plazi
scientific name	Limnebius balkei
status	sp. nov.

Treatment

Limnebius balkei View in CoL , new species

Figs. 147 View FIGURES 144 – 148 (habitus), 157 (aedeagus), 296 (map)

Type Material. Holotype (male): Antsiranana, Montagne d'Ambre, Grande Cascade, stream parallel to, elev. 800 m, 13° 34' S, 49° 10' E, 1 xi–30 xii 2004, M. Balke & D. Ottke (MD 005) ( ZSMC). Paratypes: Same data as holotype (13 ZSMC).

Differential Diagnosis. Habitus as in Fig. 147 View FIGURES 144 – 148 ; a teardrop-shaped species, quite convex, and of moderate length (ca. 0.91 mm). The pronotum has a semicircular dark brown macula surrounded widely laterally and more narrowly posteriorly with light brown. The aedeagus ( Fig. 157) in lateral view is distinctively widened at about midlength, and the protrudable gonopore tube is strong and relatively long, equal to about ½ the length of the main piece; also, the apex of the main piece is shaped differently than in other species.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 0.91/0.52; head width 0.36; pronotum 0.29/0.52; elytra 0.60/0.52; approximate height, lateral view 0.36. Dorsum with head and elytra dark brown, pronotum with ill-defined semi-circular dark brown macula surrounded laterally and posterior with light brown. Body form distinctively drop-shaped. Pronotum with disc shining, non-microreticulate, very sparsely finely punctulate, each puncture with very short adpressed seta; area posterior to eye (side view) with slightly larger punctures, each puncture with adpressed seta, longer than setae on disc. Elytra non-microreticulate or very weakly effacedly so, with punctures and setae similar to those on pronotum.

Males with first three pro- and mesotarsal segments slightly enlarged, with adhesive setae. Labroclypeal suture arcuate in frontal view in both sexes. Labrum simple, similar in sexes. Lateral angle of elytral apices more widely rounded and apices more truncate in males than in females, sutural angle more acute in females.

Etymology. Named in honor of the collector, Michael Balke.