Limnebius nanostillus

Perkins, Philip D., 2017, Hydraenidae of Madagascar (Insecta: Coleoptera), Zootaxa 4342 (1), pp. 1-264: 164-166

publication ID

https://doi.org/10.11646/zootaxa.4342.1.1

publication LSID

lsid:zoobank.org:pub:2ACD54D2-3487-432D-9323-EEC131FE2E64

persistent identifier

http://treatment.plazi.org/id/038587BB-E3A4-FF34-FF75-FAB3BD6AFE90

treatment provided by

Plazi

scientific name

Limnebius nanostillus
status

new species

Limnebius nanostillus  , new species

Figs. 149 (habitus), 159 (aedeagus), 297 (map)

Type Material. Holotype (male): Antsiranana, Ankarana, camp, waterhole at Andrafiabe cave entrance, elev. 50 m, 12° 57' S, 49° 8' E, 1 xi –30 xii 2004, M. Balke (MD 021) ( ZSMC)GoogleMaps  . Paratypes (45): Same data as holotype (19 ZSMC)  ; Antananarivo, 18.8704S 47.6708E Analamanga, Anjomara mountain next to Ambato- lampikely village, RN2, hygropetric rock, elev. 1470 m, 18° 52' S, 47° 40' E, 24 xi 2014, J. Bergsten, R. Bukontaite, J.H. Randriamihaja, T. Ranarilalatiana & S. Holmgren ( MAD14-79View Materials) (1 NHRS)GoogleMaps  ; Antsiranana, Antsaba, Antsaba River, elev. 400 m, 13° 39' S, 48° 45' E, 1 xi –30 xii 2004, M. Balke (MD 014) (2 ZSMC); Montagne d'Ambre, Foret d' Ambre, elev. 545 m, 13° 34' S, 49° 10' E, 1 xi –30 xii 2004, M. Balke & M. Monaghan (MD 010) (20 ZSMC); Same data, " MNCN AI-549 DNA specimen" (1 MNCN)GoogleMaps  ; Fianarantsoa, Isalo NP: Namaza R. hygropetric beside the river, P41H, 12.v.2006, elev. 781 m, 22° 32' S, 45° 22' E, Bergsten et al. (1 BMNH)GoogleMaps  ; Mahajanga, Boeny: Ankarafantsika NP. S 16.25300 E 0 46.73444, 71 m. a.o. 30 XI 2009 Field # MAD09-12View Materials, elev. 71 m, 16° 15' S, 46° 44' E, 30 xi 2009, J. Bergsten, N. Jönsson, T.Ranarilalatiana, HJ. Randriamihaja ( MAD09-12View Materials) (2 NHRS).GoogleMaps 

Differential Diagnosis. Habitus as in Fig. 149; the smallest Limnebius  known from Madagascar, ca. 0.77 mm long. A teardrop-shaped species, very convex and broad at the shoulders. The pronotum is bicolored, lighter brown in the posterior angles and continuing along the basal 1/3, grading gradually to darker on the disc (this is more distinctive on some specimens). The aedeagus ( Fig. 159) is relatively stout, arcuate or angled in lateral view; the main piece has a raised ridge, and the gonopore is located immediately below the setose apical area.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 0.77/0.44; head width 0.31; pronotum 0.19/0.44; elytra 0.52/0.44; approximate height, lateral view 0.29. Dorsum brown to piceous, pronotum lighter brown in basal 1/3 and in posterior lateral angles, disc darker. Body form distinctively drop-shaped. Pronotum with disc strongly 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, 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 reference to the very small size and teardrop-shaped body.

ZSMC

Zoologische Staatssammlung

NHRS

Swedish Museum of Natural History, Entomology Collections

MNCN

Museo Nacional de Ciencias Naturales

DNA

Department of Natural Resources, Environment, The Arts and Sport