Phloeonomus (Phloeonomus) rougemonti, Shavrin, 2020

Shavrin, Alexey V., 2020, New species and records of Paraphloeostiba Steel, 1960 from China and Laos and descriptions of four new species of related genera (Coleoptera: Staphylinidae Omaliinae: Omaliini), Zootaxa 4890 (3), pp. 301-329 : 322-324

Phloeonomus (Phloeonomus) rougemonti sp.n.

( Figs. 51–59 )

Type material examined: Holotype Ƌ (dissected; tergite VII damaged): ‘ CHINA Yunnan | Xishuangbanna | 22[handwritten]. I.1993 | G. de Rougemont’ <printed>, ‘ Paraphloeostiba [handwritten] | n. sp. [handwritten] | det. 199 | G. de Rougemont’ <printed>, ‘ HOLOTYPE | Phloeonomus | rougemonti sp. n. | Shavrin A. V. des. 2020’ <red, printed> ( OUMNH).

Paratypes (8 specimens): 3 ƋƋ (two specimens dissected; one specimen without left elytron, and one specimen without elytra), 5 ♀♀ (three specimens dissected; one specimen without right antennomeres 5–11 and left elytron, and one specimen without elytra): same data as the holotype (1 Ƌ, 1 ♀: CS; 2 ♀♀, 4 ♀♀: OUMNH). All paratypes with red rectangular printed label: ‘ PARATYPE | Phloeonomus | rougemonti sp.n. | Shavrin A. V. des. 2020’.

Description. Measurements (n=9): HW: 0.32–0.41; HL: 0.20–0.27; AL (holotype): 0.64; OL: 0.10–0.12; PL: 0.24–0.35;PW:0.37–0.50;ESL:0.44–0.60;EW:0.49–0.67;AW:0.45–0.57;MTbL(holotype):0.31;MTrL(holotype): 0.13 (MTrL 1–4: 0.05; MTrL 5: 0.08); AedL: 0.28–0.36; TL: 1.70–2.60 (holotype: 2.35).

Body yellow-brown to brown or reddish-brown, with slightly darker head and sometimes pronotum, and somewhat paler elytra; antennomeres 6–11 brown; mouthparts, antennomeres 1–5, legs, and intersegmental membranes of abdomen yellow. Head, pronotum, and abdomen without punctation; elytra with irregular, dense and deep punctation, indistinctly and vaguely arranged in several longitudinal rows in middle. Head with regular, coarse microsculpture, transverse on vertex and isodiametric in middle portion; neck with distinct transverse meshes; pronotum with microsculpture similar to that of middle portion of head; scutellum with dense transverse meshes; elytra with dense, regular microsculpture, indistinctly coarser than that of pronotum; abdomen with coarse, isodiametric microreticulation.

Head slightly convex in posterior portion between ocelli and eyes, with wide postantennal depressions, 1.5–1.6 times as broad as long, with short and deep anteocellar foveae, reaching level of basal third of eyes; postocular carina lacking; ocelli moderately large, distance between ocelli slightly greater than distance between ocellus and posterior margin of eye. Antennae reaching basal margin of elytra when reclined; basal antennomere about twice as long as broad, antennomere 2 slightly narrower than basal antennomere, 3 narrow, about as long as 2, 4 about as long as wide, 5 slightly transverse, slightly wider than 4, 6–10 progressively widened apicad, covered by dense pubescence, 8–9 about twice broader than long, 10 slightly longer than 9, apical antennomere 1.8 times as long as 10, from about middle gradually narrowing toward rounded apex.

Pronotum 1.1–1.4 times as broad as long, 1.1–1.2 times as broad as head, widest in about apical third, rounded apicad and gradually narrowing toward obtuse posterior angles; anterior margin widely concave, slightly shorter than posterior margin; middle portion of disc with distinctly elevated longitudinal line and deep and wide paramedian impressions between it, stretching from medioapical to mediobasal portion, distinctly widened basally.

Elytra slightly broader than long, 1.7–1.8 times as long as pronotum, slightly widened apicad; posterior margins straight or indistinctly rounded; middle portion of each elytron in some specimens with very indistinct and irregular longitudinal elevations between punctures.

Metatarsus more than twice as long as metatibia.

Abdomen slightly narrower than elytra, with two small, round wing-folding patches in abdominal tergite IV; apical margin of abdominal tergite VII with narrow palisade fringe.

Male. Posterior margin of abdominal tergite VIII rounded ( Fig. 46 ). Posterior margin of abdominal sternite VIII concave ( Fig. 47 ). Aedeagus with moderately wide basal bulb, narrowing toward apex, with two parallel, curved dorsal plates; parameres significantly extending beyond apex of median lobe, widened apically, with two short apical and several short setae on inner and outer margins of each paramere; internal sac narrow, with long sclerotized structures in apical and basal portions, and with long flagellum ( Figs. 51–52 ). Aedeagus laterally as in Fig. 53 .

Female. Posterior margins of abdominal tergite VIII ( Fig. 23 ) and sternite VIII ( Fig. 24 ) straight. Female accessory sclerite as in Fig. 58 . Spermatheca as in Fig. 59 .

Comparative notes. Regarding body size, coarse microsculpture of the forebody, the absence of punctation on the pronotum, and the presence of a moderately deep paramedian impression on the pronotum, P. rougemonti sp.n. is similar to P. (P.) nigritulus Cameron, 1930 from Naga Hills of Assam, northern India (Cameron 1930). It differs from this species by paler coloration, a narrower pronotum, and coarser and denser punctation of the shorter elytra.

Distribution. The species is known only from the type locality in Jinghong, Xishuangbanna Dai Autonomous Prefecture, Yunnan.

Bionomics. See the bionomics chapter of P. ampliata sp.n. above.

Etymology. Patronymic; the species is named in memory of the late Guillaume de Rougemont (1945–2020), the collector of the type specimens.

Figures

FIGURES 51–53. Aedeagus of Phloeonomus rougemonti: 51–52—parameral view (51: holotype; 52–53: paratype), 53—lateral view. Scale bar: 0.1 mm.

FIGURES 54–59. Abdominal segments of Phloeonomus rougemonti: 54—male tergite VIII (dorsal view), 55—male sternite VIII (ventral view), 56—female tergite VIII (dorsal view), 57—female sternite VIII (ventral view), 58—female accessory sclerite, 59—spermatheca. Scale bar: 0.1 mm.

FIGURES 46–50. Abdominal segments of Omalium khmericum: 46—male tergite VIII (dorsal view), 47—male sternite VIII (ventral view), 48—female tergite VIII (dorsal view), 49—female sternite VIII (ventral view), 50—female accessory sclerite. Scale bar: 0.1 mm.

FIGURES 23–26. Aedeagus of Paraphloeostiba (23–24: P. cooteri (paratype), 25–26: P. gayndahensis (Hong Kong)): 23, 25—parameral view, 24, 26—lateral view. Scale bar: 0.1 mm.