Dyscharachthis dominicana Otto, 2023

Otto, Robert L., 2023, The false click beetles (Coleoptera: Elateroidea: Eucnemidae) of the Dominican Republic. Part I: A look into the past, Insecta Mundi 2023 (973), pp. 1-23 : 10-12

Dyscharachthis dominicana Otto , new species

Fig. 8–9

Holotype. Embedded in near triangular Dominican Republic amber piece, 19 mm × 10 mm × 5 mm. Amber piece is clear yellow with air bubbles and other debris.

Diagnosis. Structures and overall length of antennae proportional to its body length will distinguish the species from all known species.

Description. Length, 3.0 mm. Width, 1.0 mm. Habitus subcylindrical, moderately elongate and tapering towards the elytral apex; uniformly blackish; head, pronotum and elytra clothed with short recumbent setae ( Fig. 8 ). Head: Closely punctate, subspherical with convex frons; median carina present on frontoclypeal region and frons; surfaces shiny; apical margin of frontoclypeal region fairly evenly rounded, about 2.0 times wider than base; mandibles stout, bidentate and densely punctate. Antennae: Weakly serrate, reaching about half the length of the body; lateral ridge present on scape, pedicel and flagellomeres I–VI; flagellomere I longer than II; flagellomere II as long as III; flagellomere III shorter than IV; flagellomeres IV–VIII longer than wide; flagellomere IX longer than VIII. Pronotum: Closely punctate; surface shiny; longer than wide; base wider, with short hind angles; sides slightly arcuate; disc simple; base with short, median impressed line above scutellum; hypomeron with basally closed lateral antennal grooves. Scutellum: Punctate, oblong, triangular and distally rounded. Elytra: Striae absent; disc closely punctate. Legs: First tarsomere as long as 2–5 combined on mesothoracic and metathoracic tarsi; tibiae rounded in cross section; metatarsomeres I–IV simple; metatarsomere V elongate with simple claws. Venter ( Fig. 9 ): Punctate, with recumbent setae; grooves for reception of tarsi on metathoracic and abdominal sterna I–IV absent; metaepisternum parallel-sided; metacoxal plates medially nearly 4.0 times wider than laterally.

Etymology. Specific epithet is derived from the locality in which the fossilized resin with the specimen was unearthed.

Figures

Figures 6–10. Dominican amber Eucnemidae. 6) Palaeoquirsfeldia epicrana Otto sp. nov., head. 7) Palaeoquirsfeldia epicrana Otto sp. nov., ventral view. 8) Dyscharachthis dominicana Otto sp. nov., dorsal view. 9) Dyscharachthis dominicana Otto sp. nov., ventral view. 10) Idiotarsus poinari Otto sp. nov., dorsolateral view. (Scale: 6–9 = 1.0 mm; 10 = 2.0 mm).