Hadrophorus martinkae, Hlaváč, Peter & Nakládal, Oto, 2016

Hlaváč, Peter & Nakládal, Oto, 2016, The Pselaphinae (Coleoptera: Staphylinidae) of Madagascar. IV. Contribution to the knowledge of subtribes Hoplitoxenina and Dimerometopina with description of a new species of Hadrophorus Fairmaire, 1898, Zootaxa 4105 (3), pp. 274-284 : 276-278

Hadrophorus martinkae sp. nov.

( Figs. 1–21 )

Material studied. Holotype, ♂: (p) Madagascar: Mt. d‘Ambre / (p) Ex. coll. R. Rous / (p) red label HOLOTYPE, Hadrophorus martinkae sp. nov., P. Hlaváč det., 2015 ( NMPC). Paratypes, 3♂, 3♀: the same data as holotype ( CPH, CVB)

Description. Body ( Figs. 1 , 2) entirely reddish-brown, head and pronotum rugose, elytra and composite tergite smooth, shiny. Length 2.10–2.20 mm, maximum width of elytra 0.86–0.88 mm.

Head ( Figs. 3, 4, 5, 8 , 9 ) widest across eyes, 1.3 as long as wide, rostrum slightly rounded, temples slightly shorter than rostrum, about twice as long as diameter of eyes, frontal fovea absent, vertexal foveae ( Fig. 4 , v f) welldefined. Clypeus ( Fig. 5 , cl) barely visible dorsally, connected to rostrum by narrow bridge.

Mouthparts rudimentary but well-developed, completely hidden in ellipsoid buccal cavity ( Figs. 6, 8 ), about 2.2 times as wide as high. Labrum ( Figs. 6 , 9 , lb) small, semi-ellipsoid, with 5 setae on inner margin mandibles reduced. Mandibles reduced ( Figs. 6 , 9 , md). Maxilla ( Figs. 6, 7 ) reduced, cardo ( Figs. 6, 7 , 9 , cd) hemispherical, basistipes ( Figs. 6, 7 , 9 , bst) with one long seta, with one palpomere ( Figs. 6, 7 , 9 , plp) pedunculate at base, strongly enlarged at apex, with bunch of apical setae, mentum ( Figs. 6, 8 , 9 , mn) rhombic, with many long setae.

Venter of head ( Fig. 8 ) glabrous, with few setae, mentum and submentum fused, head divided by occipital constriction ( Figs. 4, 8 , occ) into larger head capsule and short neck region, pre-occipital part of constriction with isodiametric sculpture, gular plate ( Figs. 6, 8 , 9 , gp) large, deeply depressed towards two largely separated tentorial pits ( Fig. 8 , tp).

Antennae long ( Figs. 4 , 10 ), with three antennomeres, scape minuscule, not visible dorsally, II also small, slightly visible dorsally, terminal antennomeres very long, about 8–9 times as long as wide at apex, oval in cross section.

Pronotum ( Fig. 11 ) 1.1 times as long as wide, with well-defined antebasal fovea and median sulcus, with minuscule lateral foveae ( Fig. 11 , lf).

Venter ( Figs. 14 –18) almost entirely rugose, on sides less rugose, with short uneven pubescence. Prosternum ( Figs. 14 –16) more than three times shorter than pronotum, with basisternal part ( Fig. 14 , bs) short, median prosternal projection ( Figs. 14 , 16, pstpr) well-developed, median procoxal fovea absent, lateral procoxal foveae ( Figs. 14 , 16, lpcf) present, procoxal cavities confluent. Hypomera ( Fig. 14 , hy) large, expanded mesally to sharp triangular projection. Mesoventrite ( Figs. 14 –16) about three times shorter than metaventrite, fused together, anterior mesoventral process triangular, mesocoxae well-separated by wide isthmus (Fig. 15, ist), with median mesoventral projection ( Figs. 14 –16, msvpr) and with lateral mesoventral foveae ( Figs. 14 , 15, lmsf). Metaventrite (Figs. 15, 16) large, about twice as wide as long, with median metaventral projection (Figs. 15–17, mvtpr), metacoxae widely separated by wide, short, basal metaventral process (Figs. 15, 17, mtvp). First visible sternite (III) short (Fig. 17), about three times shorter than second (IV) in midline, second (IV) with two well-defined basolateral foveae (Fig. 17, blf) connected to its base by oblique carinae, third (V) as long as first (III), fourth (VI) slightly shorter than third (V), all sternites with uneven, short setae, pygidium (Fig. 17, IX) small, ovoid.

Elytra ( Fig. 12 ) 1.35 times as wide as long, 1.5 times as long as pronotum, with three well-defined basal foveae ( Fig. 12 , bf) and three discal carinae ( Fig. 12 , dc1, dc2, dc3), dc1 entire, dc2 long, exceeding 2/3 of elytral length, dc3 short, not reaching 1/3 of elytral length, humeri will well-defined, prominent tooth. Elytral trichomes long, slender, macrosetae-like.

Abdomen ( Fig. 13 ) 1.25 times wider than long, 1.20 times as long as elytra, composite tergite (IV–VI) smooth, basal depression expanded to discal area, with trichomes on each side, with three visible paratergites, first paratergites bearing large trichomes, further tergites not visible in dorsal view.

Legs long and slender, midlegs (Fig. 18) strongly modified in males, mesofemora with long, slender, outwards curved prebasal spines, mesotibiae with large preapical spurs.

Aedeagus ( Figs. 20–21 ) about 0.37 mm long, about 2,15 as long as wide, basal bulb large, apical lobe small, slender and pointed at apex, ventrolateral foramen slightly projecting, phallobase diaphragm oval, about 1.6 of length of median lobe.

Sexual dimorphism. Females slightly larger, length 2.20–2.30 mm, maximum width of elytra 0.92–0.94 mm, midlegs simple, unmodified.

Differential diagnosis. Hadrophorus martinkae differs readily from its congeners by having the pronotum hemispherical with rounded sides in the anterior half and lacking anterior angles, base of elytra with 3 well-defined foveae, and by very long antennae that are more than 8 times as long as wide at the apex and are lacking any indication of segmentation.

Biology. Myrmecophilous species, host ant: Pheidole spinosa Forel, 1891 (Brian Taylor det., 2015).

Distribution. Madagascar (Montagne d’Ambre).

Etymology. Patronymic, named after my lovely wife Martinka.

Figures

FIGURE 1. Hadrophorus martinkae, male; dorsal view. Scale bar 1.0 mm. FIGURE 2. Hadrophorus martinkae, male; ventral view. Scale bar 1.0 mm.

FIGURES 3 – 8. Hadrophorus martinkae, male; 3 — head, dorsal view; 4 — head, lateral view (occ — occipital constriction, pd — pedicel, sc — scape, III—third antennomere, vf — vertexal fovea); 5 — head, frontal view (cl — clypeus); 6 — buccal cavity, anteroventral view (bst — basistipes, cd — cardo, gp — gular plate, lb — labrum, md — mandibula, mn — mentum, plp — palpomere); 7 — maxilla (bst — basistipes, cd — cardo, plp — palpomere); 8 — head, ventral view (gp — gular plate, mn — mentum, occ — occipital constriction, tp — tentorial pits.

FIGURES 9 – 14. Hadrophorus martinkae, male; 9 — head, ventral view (bst — basistipes, cd — cardo, gp — gular plate, lb — labrum, md — mandibular, mn — mentum, plp — palpomere); 10 — right antenna, ventral view; 11 — pronotum, lateral view (lf — lateral fovea); 12 — elytra, dorsal view (bf — basal foveae; dc — discal carinae); 13 — abdomen, dorsal view; 14 — prosternum and mesoventrite (bs — basisternal part, coxI — procoxa, hy — hypomera, lmsf — lateral mesoventral fovea, lpcf — lateral procoxal fovea, msvpr — mesoventral projection, pstpr — prosternal projection, tr 1 — protrochanter).

FIGURES 20 – 21. Hadrophorus martinkae, male; aedeagus. 21 — lateral view; 22 — dorsal view. Scale bar 0.1 mm.