Octavius adriani, Janák, 2014

Janák, JiĜí, 2014, New species and subspecies of Octavius from South Africa, with a key and additional distribution records (Coleoptera: Staphylinidae: Euaesthetinae), Acta Entomologica Musei Nationalis Pragae 54 (1), pp. 195-231 : 202-203

Octavius adriani sp. nov.

( Figs 14–16 )

Type locality. South Africa, KwaZulu-Natal Province, Northington Forest, 29°28ƍS, 30°01ƍE.

Type material. HOLOTYPE: 3: ‘[KwaZulu-Natal Province]: Natal, Northington forest , 1420 m, 29.28 S – 30.01 E, forest floor litter, 12.xii.1989, E-Y: 2764, leg. Endrödy-Younga // Octavius adriani sp.n., J. Janák det. 2009’ ( TMSA) . PARATYPES: 93311 ♀♀: same data as holotype (14 spec. in TMSA, 6 spec. in JJRC).

Description. Body length 1.3–1.7 mm (M 1.5 mm, HT 1.5 mm), forebody length 0.7–0.8 mm (M 0.7 mm, HT 0.7 mm). Microphthalmous, apterous, rusty brownish to brownish, abdomen mostly darker, head and pronotum dull, elytra and abdomen moderately shiny.

Head slightly narrower than pronotum (R 0.90–0,94, M 0.92, HT 0,94), eyes small, temples at most thrice as long as eyes, temples (R 2.67–3.00, M 2.86, HT 2.69), the latter slightly arcuate widened towards posterior angles, posterior angles moderately angular, median impression between disc and base of the head narrow, moderately long and distinct, lateral parts of head ¿nely granulose, median part very densely and ¿nely reticulate.

Pronotum slightly to moderately broader than long (R 1.06–1.19, M 1.11, HT 1.17), strongly narrowed posteriorly; anterior angles slightly angular, dorsal impressions moderately deep, transverse impression deep, lateral impressions deep, but not delimited by a sharp longitudinal ridge laterally; lateral parts beside lateral impressions densely granulose, remainder of surface very densely ¿nely reticulate.

Elytra subquadrate, much broader than long (R 1.30–1.51, M 1.39, HT 1.42), with a sharp longitudinal ridge laterally; between the latter and suture with a moderate longitudinal undulation, irregularly sculptured, and moderately reticulate.

Male. Aedeagus long and narrow (n = 6, length 0.38–0.43 mm, M 0.40 mm, HT 0.39 mm), pointed apically, internal structure long and narrow, rounded apically; parameres distinctly shorter than median lobe, with 3–5 apical setae ( Fig. 14 ). Sternite 8 moderately emarginate in posterior one-eleventh ( Fig. 15 ), sternite 9 as in Fig. 16 .

Differential diagnosis. Octavius adriani sp. nov. belongs among species with small eyes, with temples less than three times as long as the eyes, with the head not or at most slightly widened posteriorly and densely reticulate temples. It is related to O. kogelbergensis sp. nov., from which it can be distinguished externally by larger body and deeply reticulate head and pronotum.

Etymology. This species is dedicated to Adrian J. Armstrong (KwaZulu-Natal Wildlife, Pietermaritzburg, South Africa), who helped me during my trip to the Republic of South Africa and supported my study of Staphylinidae .

Bionomics. All specimens have been found in siftings of forest litter in indigenous forest.

Distribution. Octavius adriani sp. nov. is currently recorded only from Northington Forest in KwaZulu-Natal Province, South Africa.

Figures

Figs. 10–16. 10–13 – Octavius acutipenis sp. nov., HT male. 14–16 – O. adriani sp. nov., 14, 15 – HT male, 16 – PT male. 10, 14 – aedeagus ventral; 11, 15 – sternite 8; 12, 16 – sternite 9; 13 – apical part of sternite 9. Scale bars = 0.1 mm.