Thallisellites olgae Kupryjanowicz, Lyubarsky et Perkovsky, 2022

Kupryjanowicz, J., Lyubarsky, G. Yu. & Perkovsky, E. E., 2022, A new genus of the subfamily Languriinae (Coleoptera: Erotylidae) from the Late Eocene Baltic amber, Far Eastern Entomologist 447, pp. 1-9 : 5-6

Thallisellites olgae Kupryjanowicz, Lyubarsky et Perkovsky , sp. n.

http://zoobank.org/NomenclaturalActs/ EAE8DDA7-969C-40A2-B4AD-75072FC501EA

Figs 1–8

TYPE MATERIAL. Holotype: number UCP UwB 1701( UCP UwB), ex coll.

Jonas Damzen JDC7010; Baltic amber, Late Eocene. Syninclusion: Acari , Tarsonemidae , cf. Tarsonemus , female.

DESCRIPTION. Body elongate-oval, length 2.3 mm, maximum width 1.1 mm,

uniformly dark brown ( Fig. 5 ). Head and pronotum shortly setose. Compound eye hemispherical. Length of compound eye equal to half head length. Facets small,

approximately same diameter as head dorsal punctures. Dorsal punctures on head moderately large, intervening spaces narrower than puncture diameter. Antenna slender, antennomeres of flagellum elongate ( Figs 4, 5 ). Antennal club weakly flattened. Basal antennomere slightly longer than and 0.3 as wide as antennomere two.

Second antennomere slightly shorter than antennomere three. Third antennomere longer than antennomere four and equal to length of basal antennomere. Antennomeres two, four, five, and seven slightly elongated. Fifth antennomere longer than next one. Sixth antennomere shorter than antennomere seven. Eighth antennomere slightly transverse, wider than antennomere seven. Ninth antennomere as long as wide, penultimate antennomere slightly transverse, terminal antennomere elongate oval. Antenna long and extending beyond basal margin of pronotum.

Pronotum transverse, ratio of pronotal width to length 1.6. Anterior margin of pronotum slightly sinuous ( Fig. 5 ). Anterolateral angles expanded, with acute spine that is curved posteriad. Extensions at the anterolateral angles without smooth face.

Maximum width of pronotum across midlength. Lateral margins slightly converged apicad and posteriad, slightly expanded, slightly serrated, not beaded. Punctures moderately large, intervening spaces about as narrow as puncture diameter. Length of elytra 2.8 of pronotal length. Posterior margin sinuous, with large median lobe.

Posterolateral angles right-angled, basal edge sinuous. Basal groove distinct, wide.

Tarsomeres one and two subcylindrical, tarsomeres three and four slightly wi-

dened beneath ( Figs 2, 7 ). Tarsomeres 1–3 about same length, tarsomere half long as antennomere two or three, terminal tarsomere the longest but shorter than combi-

ned length of tarsomeres one to four.

Scutellar shield about 1.5 times wider than long, moderately strongly punctured.

Punctures on elytra ( Fig. 6 ) with intervening spaces about one puncture diameter; at least 14 rows of larger punctures on each elytron; intervals between punctures in row are narrower than their diameters. Elytra covered with short, pale setae arranged in longitudinal rows. Setae only slightly raised and slightly overlapping each other.

Elytral seta about as long as length of tarsal claw.

Abdominal ventrites less strongly but rather densely punctured compared to metasternum ( Fig. 8 ). Ventrites densely setose. Punctures on fifth ventrite similar like on others, even and rather dense, without thickened setae and impunctate areas.

ETYMOLOGY. Patronymic. The species is named after Olga Zolotarenko, the daughter of the third author.

Figures

Figs 1–8. Photomicrographs of Thallisellites olgae sp. n., holotype, No UCP UwB 1701.