Gabrius amadina, Hromádka, 2014

Hromádka, Lubomír, 2014, A review of the Afrotropical Gabrius coryndoni species group (Coleoptera: Staphylinidae: Staphylininae), Acta Entomologica Musei Nationalis Pragae 54 (2), pp. 555-562 : 560-561

Gabrius amadina sp. nov.

( Figs 34–35 )

Type locality. Tanzania, Arusha, Mto-wa-mbu env., 3°22ƍ31ƎS, 35°51ƍ15ƎE, 900–1000 m a.s.l.

Type material examined. HOLOTYPE: J( NMPC):‘ Tanzania, Arusha,MTO-WA-MBU env., 900–1000 m, 03°22މ31ފS, 35°51މ15ފE. May 01, 2010 ’, Milan KuboĖlgt. // Holotype Gabrius amadina sp. nov. Hromádka det., 2013, [red oblong label printed]’.

Description. Body length 4.9 mm, length of fore body (to end of elytra) 2.5 mm.

Colouration. Head black, pronotum, scutellum and abdomen dark brown, posterior margin of all abdominal tergites narrowly brown-yellow, elytra dark brown-red. Maxillary and labial palpi black, mandibles, antennomere 1 and base of antennomere 2 brown, remaining antennomeres and legs yellow, tibiae darker.

Head wider than long (ratio 18: 15), slightly narrowed posteriad. Posterior angles markedly rounded, bearing two long black bristles. Interocular area with four coarse punctures arranged in a straight line. Distance between medial punctures ¿ve times as large as distance between medial and lateral puncture. Clypeus with shallow rounded depression medially. Eyes flat, shorter than temples (ratio 6: 8) posterior margin with two punctures. Anterior half of temporal area impunctate, posterior half with scattered punctures. Clypeus with microsculpture consisting of transverse waves, rest of head with traces of very ¿ne microsculpture.

Antennae short, slightly widened distally, reaching midlength of pronotum when reclined. Antennomeres 1–3 and 11 distinctly longer than wide, antennomere 4 slightly longer than wide, antennomere 5 as long as wide, antennomere 6 slightly wider than long, antennomeres 7–10 distinctly wider than long.

Pronotum slightly shorter than wide (ratio 17: 19), parallel-sided. Anterior angles rounded, bearing several bristles of variable length, posterior margin markedly rounded. Each dorsal row with six coarse punctures, punctures 2–6 equidistant, distance between punctures 1–2 larger than distance between punctures 2–6. Each sublateral row with two punctures, puncture 2 shifted toward lateral margin. Surface with microsculpture similar to that on head. Sides bearing several variably long black bristles.

Scutellum densely and coarsely punctured, diameter of punctures larger than eye-facets, punctures separated by distance smaller than one puncture diameter.

Elytra as long as wide, slightly widened posteriad. Punctation coarse and relatively sparse. Diameter of punctures larger than of those on scutellum, separated by one or one and half puncture diameter in transverse direction. Surface without microsculpture; setation brownyellow.

Legs. Metatibia longer than metatarsus (ratio 12: 10), metatarsomere 1 as long as metatarsomere 5, slightly shorter than metatarsomeres 2–3 combined.

Abdomen wide, slightly narrowed anteriad from visible tergite 3 and distinctly narrowed posteriad. First three visible tergites with two basal lines, elevated area between lines with scattered punctures. Punctation of tergites ¿ner and denser than that on elytra. Surface without microsculpture; setation similar to that on elytra.

Differential diagnosis. Gabrius amadina sp. nov may be distinguished from the similar G. amans by the shorter antennae, coarse and sparse punctation of the elytra and by the different shape of the aedeagus.

Etymology. The name of this species, a noun in apposition, is the Latin generic name of the African Cut-throat ¿nch Amadina fasciata (Gmelin, 1789).

Distribution. Known only from the type locality in Tanzania.

Figures

Figs 25–36. Genitalia of representatives of the Gabrius corydoni group (aedeagus in ventral and lateral views and detail of parameres in ventral view). 25–27 – G. obnixus Tottenham, 1956; 28–30 – G. ramifer Tottenham, 1956; 31–33 – G. vulcanus Cameron, 1950; 34–36 – G. amadina sp. nov.