Guilielmia leleupi, D’Alessandro, 2017

D’Alessandro, Paola, 2017, Guilielmia Weise, a little known Afrotropical flea beetle genus: systematic affinities and description of a second new species from Central Africa (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4323 (4), pp. 572-578 : 574-575

Guilielmia leleupi sp. nov.

( Figs 1 , 3, 5, 8 )

Type. Holotype ♂, DEMOCRATIC REPUBLIC OF CONGO, “ KiVu, UVira [03°22'54''S, 29°08'40''E], LuVubu, 2650 m, 27.xi.1950, récolté dans terreau de bambous, N. Leleup leg.” ( RMCA).

Diagnosis. Guilielmia leleupi is Very similar to G. monticola in shape, size, surface sculpture, and color ( Figs 1–2 ). HoweVer, the following characters on head, pronotum, and median lobe of aedeagus allow to distinguish it from the type species: presence of a transVerse depression between Vertex and frons ( Figs 3, 5 ) (head eVenly conVex in G. monticola ( Figs 4, 6 )); antennae paler basally ( Fig. 1 ); less conVex pronotum, with no depressions on surface ( Fig. 5 ) (more conVex, with a weak antebasal transVerse depression, and oblique depressions near posterior angles in G. monticola ( Fig. 6 )); almost rounded anterior angles of pronotum ( Fig. 5 ) (clearly beVelled and distinctly oblique in G. monticola ( Fig. 6 )); median lobe of aedeagus ( Fig. 8 ) laterally parallel in Ventral View, acutely rounded apically, without any median tooth, and straight in lateral View (in G. monticola slightly fusiform in Ventral View, apically obtusely rounded with a short median tooth, and slightly curVed in lateral View ( Fig. 9 )). Female unknown.

Description of the holotype. The specimen lacks last right antennomere, right fore and middle legs, left fore and middle tarsi. Body oVate, slightly elongate, moderately conVex ( Fig. 1 ); LB = 2.64 mm; pronotal width at middle (WP = 1.13 mm); elytral width at basal third (WE = 1.50 mm). Dorsum uniformly dark, with metallic lustre. Head ( Figs 3, 5 ) with a transVerse depression between Vertex and frons; eyes rather small; interocular space wide; punctation small but distinctly impressed on surface sparsely micropunctate on Vertex, and microreticulate on frons and genae; genae more clearly punctate; frontal tubercles Very weakly delimited; frontal grooVes thin, short, extending between antennal socket and upper ocular margin; antennae slightly longer than half the body length (LAN = 1.78 mm; LAN/LB = 0.67), brown, slightly paler basally; LA: 100:53:60:67:67:63:70:70:70:63:90. Pronotum ( Fig. 5 ) subrectangular, slightly narrowing anteriorly, slightly transVerse (LP = 0.68 mm; WP/LP = 1.67), weakly curVed laterally; anterior angles distinctly prominent, almost rounded; posterior angles slightly obtuse, with surface rather raised compared to surrounding area; lateral margins moderately expanded, Visible in dorsal View; pronotal punctation dense, eVenly distributed, small but clearly impressed on densely and finely microreticulate surface. Scutellum small, strongly transVerse, with rounded posterior margin. Elytra slightly elongate (LE = 1.85 mm; WE/LE = 0.81), clearly rounded laterally; humeral callus absent; lateral margin slightly expanded, Visible in dorsal View; punctation dense, confused, Very similar to pronotum, but impressed on rather smooth surface; basal margin slightly depressed, with coarser punctation ( Fig. 5 ). Legs brown; hind femora dorsally darker; first pro- and mesotarsomeres lacking. Venter dark brown; last abdominal Ventrite medially distinctly depressed. Median lobe of aedeagus ( Fig. 8 ) (LAED = 1.19 mm; LE/LAED = 1.56) in Ventral View laterally subparallel, apically acute with rounded tip; Ventral surface smooth; in lateral View median lobe straight, with Ventrally bent apex; dorsal ligula extending for about half the lenght of aedeagus, and formed by one main central sclerified lobe tapering towards apex and two lateral lobes enlarged apically.

Distribution. Democratic Republic of the Congo: mountain area to north-west of UVira, South KiVu (= Sud- KiVu ProVince). Chorotype: Central Afrotropical (CAT).

Etymology. The species is named after its collector, Dr. N. Leleup, renowned specialist of Coleoptera Staphylinidae Pselaphinae .

Figures

FIGURES 1 – 2. Habitus of Guilielmia Weise. 1) Guilielmia leleupi sp. nov., holotype, male. 2) G. monticola, male.

FIGURES 3 – 9. 3) Head in frontal view of Guilielmia leleupi sp. nov. fg: frontal groove; td: transversal depression. 4) Ditto of G. monticola. 5) Pronotum and head in dorsal view of G. leleupi sp. nov. cp: coarse punctation; td: transversal depression. 6) Ditto of G. monticola. od: oblique depression. 7) Metafemoral extensor tendon of G. monticola. ba: basal angle of the ventral lobe; dl: dorsal lobe; ea: extended arm of the dorsal lobe; rf: recurve flange; vl: ventral lobe. 8) Aedeagus in ventral (v), dorsal (d), and lateral (l) view of G. leleupi sp. nov. 9) Ditto of G. monticola.