Khasurtyphilus storozhenkoi Lyubarsky, Vasilenko, Legalov & Perkovsky, sp. nov.

urn:lsid:zoobank.org:act: 1D229D1F-9A4E-44A8-894E-6E00CF1151FE

(Figs 1–10)

Material. Holotype, PIN 5340 /1248.

Locality and horizon. The Khasurty fossil site, Western Transbaikalia (Zakamensky District of the Republic of Buryatia, 10 km south of the village of Tsakir, 50˚21'N, 103˚38'E), late Barremian.

Description. Body moderately elongate, about 4.8 mm long, 1.7 mm wide.

Head prognathous, transverse, with distinct temples.Temples short, shorter than length of eye (Fig.5). Compound eyes slightly prominent, moderately coarsely facetted. Eyes large, about 0.5 as long as head. Antennal insertions partially covered by a weak frontal carina; subantennal grooves present. Antennomeres 2–5 slightly elongated, their length 1.2 times the width (Figs 3, 5), antennomeres 6, 8 subquadrate. Antennomeres 9 and 10 slightly transverse. Antennomere 11 elongate-oval. Antennae short, not extend beyond of posterior edge of pronotum.

Pronotum slightly narrowed basally and apically, widest in posterior third of its length (Figs 3, 4). Pronotum 0.6 times as long as wide. Anterior margin of pronotum without notch. Anterior and posterior angles obtuse-angular. Lateral margin very finely serrulate (Figs 1, 3). Procoxae not projecting below prosternum. Procoxae rounded, procoxal cavity about as long as wide. Prosternal process truncate apically, and slightly beyond posterior margins of coxae, flat (Figs 1, 5). Submesocoxal lines absent. Underside (prothorax, metathorax, abdomen) fine and irregularly punctate. Metaventrite shorter than prothorax and mesoventrite combined.

Elytra elongate-oval, about 2.1 times as long as combined width and 4.4 times as long as pronotum; surface with fine, (possibly) irregular punctation; epipleura complete. Elytra fully cover abdomen from above.

Legs relatively long and slender. Tibiae slightly and gradually widened distally. Tibial teeth and spurs absent (Fig. 8). Tarsomere 4 inserted between lobes of tarsomere 3. Tarsomere 5 longer than tarsomere 1.

Abdomen with five ventrites (Figs 1, 7, 9). Ventrite I 1.6 times as long as II; II 1.3 times as long as III and IV, ventrites III and IV approximately equal in length, ventrite V long, 0.7 times as long as ventrite I. Postcoxal lines absent. Intercoxal process small, not acute. Puncturation on V ventrite normal and fine.

Etymology. In honour of our friend entomologist Dr. Sergey A. Storozhenko (Vladivostok).

Remarks. Khasurtyphilus is most morphologically similar to the recently described genus Turgaphilus from the Turga Formation. The new genus differs from Turgaphilus in the following characters: lateral margin with tooth in posterior third of its length (Turgaphilus has the lateral margin of pronotum without tooth); the length of tarsomere 1 is shorter than tarsomeres 2 and 3 combined (Turgaphilus has the tarsomere 1 is longer than tarsomeres 2 and 3 combined); tarsomere 5 is longer than tarsomere 1 (Turgaphilus has tarsomere 5 approximately equal to tarsomere 1); metacoxae narrowly separated (Turgaphilus has the metacoxae widely separated). The new genus differs from Turgaphilus also in size: Khasurtyphilus is larger, its length 4.8 mm, and Turgaphilus is 2.5–2.8 mm.