Thallisellites 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 : 3-5

Tribe Thallisellini Sen Gupta, 1968

Genus Thallisellites Kupryjanowicz, Lyubarsky et Perkovsky , gen. n.

http://zoobank.org/NomenclaturalActs/ DC2A21D0-E24B-4DBA-819E-FEB7068158D2

Type species: Thallisellites olgae sp. n.

DIAGNOSIS. New genus appears similar to Serramorphus but readily differs in the structure of the lateral margin of the pronotum, which is smooth, rounded and not dentate compared to sinuous and spinose lateral margin of pronotum in Serramorphus .

Frontoclypeal suture present. Antennal insertion not exposed in dorsal view.

Antenna with 11 antennomeres and three-segmented club. Supraocular line not present. Anterolateral angles of pronotum well developed, spine-shaped. Lateral margin of pronotum in dorsal view rounded, not dentate. Pronotal pits not present.

Procoxal cavity open behind. Mesoventral process narrower than mesocoxa. Submesocoxal lines not present. Tarsi without lobes beneath. Tibial terminal spurs not present. Tarsal formula 5-5-5. Length of tarsomere 1 equal to tarsomere 2. Scutellum transverse. Elytral punctation striate. Elytra narrowly explanate. Humeral spine not present. Epipleuron complete, extending to apex of elytron. Femoral line not present.

DESCRIPTION. Body parallel-sided, elongate, narrow, dorsally with decumbent pubescence. Head with hemispherical compound eyes ( Fig. 1 ). Compound eyes comparatively large, gently facetted. Supraocular line not present. Antenna with 11

antennomeres and three-segmented club. Frontoclypeal suture present. Antennal insertion concealed in dorsal view. Maxillary palpus trimerous, basal palpomere short and transverse, second palpomere rounded, same long as wide, third palpomere elongate, slightly curved ( Fig. 1 ). Frons weakly convex in dorsal aspect, punctured.

First antennomere longest, elongated ( Figs 1, 4 ). Antennal furrows not present.

Pronotum transverse, barely narrower than elytra, without lateral teeth, covered with short pubescence. Anterolateral angles of pronotum strongly developed ( Fig.

1, 5). Dorsal punctures dense. Lateral margins not beaded, rounded in dorsal view,

not serrate, smooth. Posterior margin with basal lobe, basal depression, and basal pits not present.

Prosternal process straight cropped at the top, extending beyond procoxae ( Fig. 3 ).

Procoxal cavity open externally. Width of mesoventral process narrower than mesocoxa. Mesocoxae separated by ca. 0.5– 1.0 times width of mesocoxa. Mesoventral process narrower than mesocoxa. Submesocoxal line not present. Submetacoxal lines not present. Longitudinal line of metasternum not present ( Fig. 7 ). Pro-, meso-,

and metasternum strongly and densely punctured ( Fig. 7 ). Metasternal process broad,

extending beyond posterior margin of mesocoxae.

1 – head, ventral view; 2 – hind tarsi; 3 – thorax, ventral view; 4 – habitus, lateral view; 5 –

habitus, dorsal view; 6 – elytra, dorsal view; 7 – habitus, ventral view; 8 – abdomen, ventral view.

Legs slender, tibia not dilated apically ( Figs 2, 4 ). Apex of tibia crowned with several thickened setae. Tarsomeres slightly elongate. Pro-, meso- and metatibia apically not spinose. Tarsal formula 5-5-5. Tarsomeres not lobed. Tarsomere four not reduced. Tarsal claws not serrated.

Scutellar shield transverse, punctured. Humeral teeth at base of elytron not present. Elytral disc punctured, lateral margin of elytra slightly flattened and reflected in dorsal view ( Fig. 6 ). Punctures of elytra moderately large, arranged into longitudinal rows. Ventrites weakly pubescent, irregularly punctured. Epipleuron extending towards apex of elytron ( Fig. 8 ).

First abdominal ventrite slightly longer than width of second ventrite. Femoral lines not present.

ETYMOLOGY. Generic name is derived from the tribal name Thallisellini .

Figures

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