This form has not yet been described, it is known from subfossil remains that were recovered from substrate that was collected on the island of Mangaia, Cook Islands. [1]
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References:
[1] Nick Porch; Tessa R. Smith: New Pycnomerus Erichson (Coleoptera: Zopheridae: Pycnomerini) from Rimatara, French Polynesia. Zootaxa 4237(1): 154-166. 2017
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edited: 11.06.2020