Description: English: Onoba semicostata (Montagu, 1803) | Collection Natural History Museum Rotterdam | NMR993000030878 - Trondheimsfjorden, Sletvik, Sør-Trøndelag, Norway. Date: 1 July 1976. Source:
https://www.gbif.org/occurrence/2570104271. Author: Joop Trausel | Frans Slieker.
