Mihiura Bark-gnawing Beetle (Tenebroides mihiura)

This species was described in 2020, it is known only from the type material, a subfossil prothorax, that was collected from a sediment core sample that had been taken from the Mihiura Swamp on the island of Tubuai in the Austral Islands. 

The species reached a size of about 0,6 cm in length; it might have been black in color. [1]

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References:

[1] Jiří Kolibáč; Milada Bocakova; James K. Liebherr; Thibould Ramage; Nick Porch: Extinct and extant Pacific Trogossitidae and the evolution of Cleroidea (Coleoptera) after the Late Triassic biotic crisis. Zoological Journal of the Linnean Society 20: 1-37. 2020

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edited: 02.11.2020