Eusphalerum sp. 4

Shavrin, Alexey V. & Yamamoto, Shuhei, 2019, Unexpected palaeodiversity of omaliine rove beetles in Eocene Baltic amber (Coleoptera, Staphylinidae, Omaliinae), ZooKeys 863, pp. 35-83 : 35

Eusphalerum sp. 4 Figures 12, 13, 87-88, 90

Material examined.

One male, as an inclusion in the same piece of the Baltic amber that contains Eu. sp. 2 and Eu. sp. 3, with an additional label: " Eusphalerum sp. 4 | Shavrin A.V. det. 2018" (private collection of Vitaly Alekseev (Kaliningrad, Russia), registered as AWI-045).

Preservation.

The specimen is located with its dorsal side near the widest outer margin of the piece of amber (Figs 12, 13). It is relatively clouded with many details not visible both dorsally (Fig. 87) and ventrally (Fig. 88).

Remarks.

This specimen is about 2.30 mm long (Figs 87, 88). Based on the relatively narrow body and shapes of antennomeres, as well as the punctation and microsculpture of the forebody, it is similar to Eu. sp. 2. However, we consider this specimen belongs to a different species, because the eyes of this specimen are widely rounded as in Eu. kanti sp. nov. and Eu. sp. 3, and because some details of the body such as dorsal portion of the head and shapes of front and middle tarsi are poorly visible. Apical part of the abdomen (ventral view) as in Figure 90, with sternite VII distinctly emarginated medioapically.