On the non-homologous nature of the ‘cavum’ in Achnanthidiaceae (Bacillariophyta) as illustrated by Xenobennettella moai sp. nov. , a marine benthic diatom from Easter Island (Rapa Nui, South Pacific)

A new marine benthic diatom belonging to the genus Xenobennettella Witkowski & Riaux-Gobin is described from the coastal waters of Easter Island, Rapa Nui, Polynesia, South Pacific. The newly proposed species, Xenobennettella moai sp.