Paraphloeostiba atramentaria, Shavrin, 2024

Shavrin, Alexey V., 2024, Twenty-one new species of Omaliini from the Papuan Region (Coleoptera: Staphylinidae: Omaliinae), with diagnostic and faunistic notes on some species of the genus Paraphloeostiba Steel, 1960, Zootaxa 5424 (3), pp. 251-307 : 259-261

Paraphloeostiba atramentaria sp. n.

( Figs 3 , 16–19 )

Type material. Holotype ♂ ( Fig. 3 ; dissected): ‘ IRIAN JAYA: Paniai Prov. | Sinak, 2000-2200m | 14. -17. 12. 1995 | leg. A. Riedel’ <printed>, ‘ HOLOTYPE | Paraphloeostiba | atramentaria sp. n. | Shavrin A. V. des. 2024’ <red, printed> ( NMW).

Description. Measurements: HW: 0.47; HL: 0.32; OL: 0.17; AL: 0.63; PL: 0.42; PWmax: 0.62; PWmin: 0.51; ESL: 0.68; EW: 0.80; MTbL: 0.40; MTrL: 0.22 (MTrL 1–4: 0.07; MTrL 5: 0.15); AW: 0.82; AedL: 0.51; BL: 2.75.

Habitus as in Fig.3 . Body and antennomeres 6–11 dark brown; mouthparts, antennomeres 1–5 and legs yellowish. Head with sparse and fine punctation, more indistinct in middle and slightly denser in infraorbital portions; neck without visible punctation; pronotum with fine and dense punctation, slightly larger than that in head, sparser in middle; scutellum without punctures; elytra with dense and fine punctation, slightly larger than that in pronotum, finer and sparser in middle, with narrow impunctate area along suture in basal half; abdominal tergites with very indistinct, fine and sparse punctation. Head with very dense and coarse microsculpture, transverse in frontal portion and distinctly isodiametric in middle; pronotum with very dense, coarse, isodiametric microsculpture; scutellum with very fine transverse meshes; elytra with dense isodiametric microreticulation, slightly larger than that in pronotum; abdominal tergites with dense microsculpture, transverse in abdominal tergites III–IV and isodiametric in abdominal tergites V–VIII.

Head slightly elevated in middle, with elongate anteriomedian depressions, 1.4 times as broad as long, with short and deep anteocellar foveae, slightly subdiagonally stretching anteriad and reaching basal third of length of eyes; postocular carina indistinct, acute. Ocelli small, located slightly below level of posterior margins of eyes; distance between ocelli about 1.6 times as long as distince between ocellus and posterior margin of eyes. Apical antennomere about 1.5 times as long as preapical segment. Antennomere 3 about as long as and distinctly narrower than 2, 4 about as wide as and about twice shorter than 3, 5 distinctly longer and broader than 4, 6–9 slightly longer and distinctly broader than 5, 10 indistinctly longer than 9, apical antennomere about 1.5 times as long as 10, from about middle gradually narrowed apicad toward subacute apex.

Pronotum 1.4 times as broad as long, slightly wider than head, widest in middle, distinctly more narrowed posteriad than anteriad; posteriolateral impressions wide, shallow.

Elytra 1.6 times as long as pronotum. Metatarsi slightly less than twice as long as metatibia. Male. Posterior margin of abdominal tergite VIII truncate ( Fig. 18 ). Posterior margin of abdominal sternite VIII widely and deeply concave ( Fig. 19 ). Aedeagus with wide basal portion, strongly narrowed toward narrow middle portion of elongate median lobe with small rounded apex; parameres moderately narrow, reaching apex of median lobe, each with three moderately short apical and six setae on inner margin; internal sac narrow and moderately short, with several long curved sclerotized structures in basal portion ( Fig. 16 ). Lateral aspect of the aedeagus as in Fig. 17 .

Female unknown.

Comparative notes. Based on the very narrow median lobe and the parameres, P. atramentaria sp. n. is similar to P. barclayi sp. n., P. betlephila sp. n., P. coprophila sp. n., and P. steeli sp. n. It can be distinguished from all these species by the following morphological features: from P. barclayi sp. n. by the darker elytra, slightly narrower pronotum and the shorter parameres; from P. betlephila sp. n. by the presence of the punctation on the head, coarser punctation of the pronotum, the narrower pronotum, the shorter elytra and slightly shorter parameres; from P. coprophila sp. n. by the presence of the punctation on the head, coarser punctation of the pronotum, shorter elytra, and slightly narrower and longer parameres; from P. steeli sp. n. by the darker coloration, the absence of elevations between punctures on the elytra, the shorter parameres with significantly narrower apical portions. From all these species, P. atramentaria sp. n. can be distinguished by the larger body and details of the external and internal morphology of the aedeagus. Distribution. Paraphloeostiba atramentaria sp. n. is known only from the type locality in Western New Guinea, Indonesia. Etymology. The specific epithet is the Latin atramentarius, - a, -um (blackish). It alludes to the coloration of the body. Bionomics. The holotype was collected at elevations from 2000 to 2400 m a.s.l. The detailed bionomial data are unknown.

Figures

FIGURES 1–6. Habitus of Omaliini: 1–Nipponophloeostiba hornabrooki (holotype), 2–Paraphloeostiba assimile (holotype), 3–P. atramentaria (holotype), 4–P. attenuata (paratype), 5–P. barclayi (paratype), 6–P. betlephila (holotype). Scale bars: 1.0 mm.

FIGURES 16–19. Paraphloeostiba atramentaria (holotype): 16–aedeagus, parameral view, 17–aedeagus, lateral view, 18–male abdominal tergite VIII, 19–male abdominal sternite VIII. Scale bar: 0.1 mm.