Idiotarsus poinari 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 : 12-13

Idiotarsus poinari Otto , new species

Fig. 10–11

Holotype. Embedded in a somewhat diamond-shaped Dominican Republic amber piece, 28 mm × 10 mm × 10 mm. Amber piece is clear dark yellow/orange with numerous small air bubbles, micro fractures and some debris.

Diagnosis. Smaller size (3.5 mm), along with very short recumbent setae will distinguish the species from any known Idiotarsus species in Central and North America.

Description. Length, 3.5 mm. Width, 1.0 mm. Habitus subcylindrical, elongate and slightly attenuate towards the elytral apex; uniformly blackish; head, pronotum and elytra clothed with sparse, very short recumbent setae ( Fig. 10 ). Head: Surfaces shiny with widely spaced, shallow punctures; subspherical with convex frons; median carina present on frontoclypeal region and frons; apical margin of frontoclypeal region evenly rounded, less than 2.0 times wider than base; mandibles stout, bidentate and densely punctate. Pronotum: Widely and shallowly punctate; surfaces shiny; longer than wide; base wider, with moderate hind angles; sides slightly arcuate, almost parallel-sided; disc simple; hypomeron with basally closed lateral antennal grooves. Scutellum: Very shallowly punctate, quadrate and distally rounded. Elytra: Striae absent; disc with widely spaced, shallow punctures. Legs: First tarsomere longer than 2–5 combined on mesothoracic and metathoracic tarsi; tibiae rounded in cross section; metatarsomeres I–II simple; metatarsomeres III–IV ventrally lobed; metatarsomere V short with simple claws. Venter ( Fig. 11 ): Sparsely punctate, with short recumbent setae; metathoracic sternum and abdominal sterna I–IV with grooves for reception of tarsi; metaepisternum caudally widened; metacoxal plates medially 4.0 times wider than laterally.

Etymology. The species is dedicated in honor of Dr. George Poinar, Paleobiologist from Oregon State University for his work on amber, the reconstruction of the ancient forests of Dominican Republic and answering my many questions about amber.

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).

Figures 11–14. Dominican amber Eucnemidae. 11) Idiotarsus poinari Otto sp. nov., ventral view (distorted). 12) Euryptychus antilliensis Otto sp. nov., dorsal view. 13) Euryptychus antilliensis Otto sp. nov., antenna and pronotum. 14) Euryptychus antilliensis Otto sp. nov., ventral view. (Scale: 11–14 = 2.0 mm).