This species has not yet been described, it is known from subfossil remains that were recovered from substrate that was collected on the island of ‘Atiu in the 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