Lucanobium guianense Paulsen, 2011

Paulsen, M. J., 2011, A second species of Lucanobium Howden and Lawrence from South America (Coleoptera: Lucanidae: Aesalinae), Insecta Mundi 2011 (171), pp. 1-3 : 2-3

Lucanobium guianense Paulsen , new species

Type specimens. Holotype male ( FSCA) labeled: a) “ FRENCH GUIANA: / Amazone Nature Lodge / 30 km SE Roura on / Kaw Rd. 5-19-II-2010 / J. E. Eger, coll., 300 m ”; b) “ N04 o 33.570’ / W052 o 12.433’ / UV Light Trap”; c) on red paper, “ Lucanobium guianense / Paulsen [male symbol] / HOLOTYPE ” . Allotype female ( FSCA) labeled: a) “ FRENCH GUIANA: Ama- / zone Nature Lodge, 30 / km SE Roura on Kaw / Rd. 10-18-IV-2007, D / G Hall & J E Eger, coll.”; b) “ N04 o 34.135’ / W052 o 11.150’ / 227m MV Light”; c) on red paper, “ Lucanobium guianense / Paulsen [female symbol] / ALLOTYPE ”. Female paratype (in the collection of the author) labeled: a) FRENCH GUIANA: 28 / km SE Roura on Kaw / Rd., 17-II-2010, J. E. / Eger, coll., MV Light”; b) “ N040 o 34.252’ / W052 o 12.797’; 306 m elev.”; c) on yellow paper, “ Lucanobium guianense / Paulsen [female symbol] / PARATYPE ”. Female paratype ( FSCA) labeled: a) “ FRENCH GUIANA: 27 / km SE Roura on Kaw / Rd. 21-IV-2007, J. E. / Eger, coll. MV Light”, b) “[female symbol]”; c) as preceding paratype .

Holotype description. Length: 4.2 mm. Width: 2.9 mm. Color/Vestiture: Surface dark brown, mostly obscured by flat, disc-like whitish or tan scales and erect, dark and light brown scale-like bristles. Head: Surface as in L. squamosum . Mentum rectangular, elongate (distinctly wider than long). Base of maxilla (stipes/cardo) distinctly protruding from beneath mentum. Pronotum: Form half as long as wide, moderately convex. Posterior margin bisinuate, anterior angles acute. Surface covered with disk-like scales and scattered, erect bristles; middle with transverse band of 4 poorly-defined clumps of dark bristles. Elytra: Surface as in L. squamosum , but overall scale and bristle color darker. Legs: Apex of metatibia not tumid in ventral view. Male genitalia: Aedeagus with basal piece and parameres fused to median

lobe; basal piece and parameres short, parameres about 1/10 as long as median lobe. Median lobe strongly curved ( Fig. 3 ), not expanded or sclerotized at apex as in L. squamosum ( Fig. 4 ).

Variation. Female allotype and paratypes differ in the following characters. Length: 3.5-4.2 mm. Width: 2.5-2.9 mm. Head: Mentum not elongate (about as wide as long). Base of maxilla (stipes/cardo) not as large and protuberant as in male. Pronotum: Transverse clumps of scales more defined. Legs: Apex of metatibia tumidly produced ventrally. Female genitalia: Dissection of the female genitalia will be completed by Hao Huang (Shanghai, China) for his detailed morphological study of aesaline genera that is currently in progress.

Diagnosis. This species is recognizable due to its distinct male genitalia and smaller overall size, as well as its disparate geographic distribution. The parameres of the male genitalia are broader, and short (only about 1/10 th as long as the median lobe). The median lobe is more strongly curved and not inflated at the apex as in that of L. squamosum .

Etymology. The species is named for the geographic origin of the specimens, French Guiana, and the epithet is neuter in gender.

Figures

Figures 1-4. Lucanobium spp. 1-3) Lucanobium guianense n. sp., male holotype: 1) Dorsal habitus; 2) Head and protibiae; 3) Male genitalia, a) dorsal and b) lateral views. 4) Lucanobium squamosum, male genitalia from Howden and Lawrence 1974, a) dorsal and b) lateral views (reproduced with permission).