Limnebius bergsteni, Perkins, 2017

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264 : 161

Limnebius bergsteni , new species

Figs. 144 (habitus), 154 (aedeagus), 296 (map)

Type Material. Holotype (male): Fianarantsoa, Namorona River, 7 km W Ranomafana , flight intercept-yellow pan trap in malaise trap in small clearing, montane rainforest, elev. 1100 m, 21° 15' S, 47° 25' E, 22–31 x 1988, W. E. Steiner (19 USNM); same locality, elev. 1100 m, 21° 15' S, 47° 25' E, 1–7 xi 1988, W. E. Steiner ( USNM) . Paratypes (317): Same data as holotype (19 USNM); Fianarantsoa, Namorona River, 7 km W Ranomafana , flight intercept—yellow pan trap in malaise trap, island in stream, montane rainforest, elev. 900 m, 21° 16' S, 47° 25' E, 8–21 x 1988, W. E. Steiner (4 USNM) ; Namorona River, 7 km W Ranomafana , from semi-shaded temporary pond in montane rain forest, elev. 1100 m, 21° 15' S, 47° 25' E, 8–21 x 1988, W. E. Steiner (200 USNM); same locality, elev. 1100 m, 21° 15' S, 47° 25' E, 1–7 xi 1988, W. E. Steiner (42 USNM) ; Namorona River, 7 km W Ranomafana, from stream with mossy rocks and sandy bottom, montane rainforest, elev. 1100 m, 21° 15' S, 47° 25' E, 22–31 x 1988, W. E. Steiner (1 USNM); same locality, elev. 1100 m, 21° 15' S, 47° 25' E, 1–7 xi 1988, W. E. Steiner (20 USNM); Ranomafana, Talatakely, R. Fopognina, elev. 967 m, 21° 16' S, 47° 25' E, 1 xi–20 xii 2004, M. Balke & M. Monaghan (MD 027) (3 ZSMC); Toamasina, 18.9385S 48.4219E Alaotra Mangoro Andasibe- Mantadia NP, Analamazoatra, pond 100m E from Lac Vert, shallow forest pool, elev. 940 m, 18° 56' S, 48° 25' E, 27 xi 2014, J. Bergsten, R. Bukontaite, J.H. Randriamihaja, T. Ranarilalatiana & S. Holmgren ( MAD14-15 ) (13 NHRS); Alaotra Mangoro: Analamazoatra SR: pond 100m S Lac Vert : S 18.93812 E 48.42199, GB Nets & sieves, shallow forest pond, elev. 930 m, 18° 56' S, 48° 25' E, 9 xi 2011, J. Bergsten, R. Bukontaite, T. Ranarilalatiana, & J.H. Randriamihaja ( MAD11-30 ) (15 NHRS).

Differential Diagnosis. The aedeagus is very elongate, and in that respect is similar to the aedeagi of L. lobatus and L. labratus . Also, in all three species the internal capsule is relatively small and located in the distal portion of the main piece. However, the curvatures, shapes and details of the apical part of the main piece differ distinctively in the three species ( Figs. 154, 155, 156). Externally, L. bergsteni is more distinctly teardrop shaped, and is slightly larger than the compared species. The habitus of L. bergsteni is more similar to that of L. maximadus , but the aedeagi of the two species differ markedly ( Figs. 154, 161).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 0.97/0.56; head width 0.39; pronotum 0.25/0.56; elytra 0.63/0.56; approximate height, lateral view 0.39. Dorsum brown to piceous, head and pronotum sometimes darker than elytra. Body form distinctively drop-shaped. Pronotum with disc strongly shining, non-microreticulate, very sparsely finely punctulate, punctures without apparent setae; area posterior to eye (side view) with slightly larger punctures. Elytra non-microreticulate or very weakly effacedly so, with punctures 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. Elytral apices truncate in both sexes.

Etymology. Named in honor of Johannes Bergsten, organizer of the highly successful Madagascar water beetle survey project.

Figures

FIGURES 144 – 148. Limnebius holotypes, habitus dorsal and lateral, and frontal for L. labratus.