Paraneseuthia kaibesariana, Jałoszyński, 2019

Jałoszyński, Paweł, 2019, Four new Australo-Oriental species of Paraneseuthia (Coleoptera: Staphylinidae: Scydmaeninae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 59 (2), pp. 491-498 : 493-495

Paraneseuthia kaibesariana sp. nov.

( Figs 2 , 7–8 )

Type material. HOLOTYPE: ♂, INDONESIA: MALUKU: KAI ISLANDS: two labels: ʻINDO: MALUC / Kai Bosar [sic!], Bombay / Agosti, leaf litter / 3.9.91 (4) F911018’ [white, printed], ʻ PARANESEUTHIA / kaibesariana / det. P. Jałoszyński, 2019 / HOLOTYPUS’ [red, printed] ( MHNG).

Diagnosis. Body strongly convex; frons and vertex with median, strongly elongate, impunctate and glossy area demarcated by lateral impressed and irregular rows of several tiny punctures, several similar punctures indistinctly demarcate this area also anteriorly, forming irregular group between antennal insertions; pronotum lacking transverse antebasal groove; punctures on elytra much more distinct than those on pronotum; aedeagus with median lobe broadest in sub-basal region, with strongly elongate, subtriangular and asymmetrical apical region, subapical sclerites absent; parameres conspicuously broad from base to subapical region, where they are strongly narrowed and each bears two apical setae.

Description. Male. Body ( Fig. 2 ) suboval, strongly convex; BL 1.25 mm; cuticle glossy, brown, appendages indistinctly lighter, setae light brown.

Head broadest at eyes, HL 0.18 mm, HW 0.26 mm; vertex and frons confluent, their strongly elongate, subrectangular median portion slightly convex and demarcated at each side by shallowly impressed row of several very small, irregularly distributed punctures; frons between antennal insertions with several similar punctures forming irregular group demarcating median area anteriorly. Supraantennal tubercles weakly elevated. Median area of frons and vertex virtually impunctate, glossy; punctures on sides fine and inconspicuous; setae short, suberect, sparse. Eyes conspicuously large, only slightly bean-shaped, strongly convex. Antennae short, AnL 0.50 mm; antennomeres 1–2 each elongate, 3–6 each slightly elongate, 7 as long as broad, 8 indistinctly transverse, 9 and 10 each weakly transverse, 11 much broader than 10, about 1.7× as long as broad.

Pronotum in dorsal view inversely subtrapezoidal, rounded, broadest slightly in front of middle, PL 0.38 mm, PW 0.44 mm; anterior margin broadly rounded, lateral margins rounded in anterior third, nearly straight and weakly convergent posterad in posterior third; posterior pronotal corners obtuse-angled and blunt; posterior margin weakly arcuate; lateral antebasal impressions distinct, subtriangular, each accompanied by small and shallow but distinct pit closer to lateral margin than to middle, pits not connected by groove. Punctures on pronotal disc very fine, inconspicuous; setae moderately long, sparse, suberect.

Elytra together oval, broadest near anterior third, EL 0.70 mm, EW 0.55 mm, EI 1.27; humeral calli small, elongate, elytral apices separately, broadly rounded. Punctures much larger and deeper than those on pronotum, those in anterior half separated by spaces subequal to diameters of punctures, punctures reduce in diameter and depth toward sides and apex; setae sparse, suberect, slightly longer than those on pronotum.

Legs moderately long and slender; unmodified, protibiae slightly recurved, with median portion slightly thickened. Aedeagus ( Figs 7–9 ) subtriangular in ventral view, moderately stout, AeL 0.25 mm, median lobe in ventral view broadest near base, strongly narrowing distad, with a distinct broad constriction near middle followed by broad thickening and again strongly tapered in apical third, apex subtriangular and rounded, asymmetrical, bent to one side; ostium covered by ventral subapical plate, which is subtriangular, strongly elongate and with asymmetrical, hook-like apex; endophallus lacking darkly sclerotized components; parameres conspicuously modified, conspicuously broad from base to subapical region, apices narrowed, each with two apical setae, each paramere in lateral view bent at an obtuse angle near proximal third.

Female. Unknown.

Etymology. After the island of Kai Besar; adjective.

Distribution. Indonesia, Maluku Province, Kai (or Kei) Besar (not “Bosar”, as written on the label) island (= Great Kai Island, also Nuhu Yuut or Nusteen). The locality “ Bombay ” is a village NE of Eilat.

Remarks. Paraneseuthia kaibesariana is externally unremarkable and the only certain method to unambiguously identify this species is to examine the aedeagus. The male genitalia of P. kaibesariana are unique; no other known congener has such an elongate, subtriangular and undivided apical portion of the median lobe, nor such monstrously broadened parameres.

Figures

Figs 1–4. Dorsal habitus of male holotypes. 1 – Paraneseuthia luzonica sp. nov.; 2 – P. kaibesariana sp. nov.; 3 – P. tanimbariana sp. nov.; 4 – P. morobensis sp. nov.

Figs 5–12. Aedeagus in ventral (5, 7, 9, 11) and lateral (6, 8, 10, 12) views. 5–6 – Paraneseuthia luzonica sp. nov.; 7–8 – P. kaibesariana sp. nov.; 9–10 – P. tanimbariana sp. nov.; 11–12 – P. morobensis sp. nov.