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plural ectooecia
The outer, often calcified, layer of the wall of an ovicell of a bryozoan. quotations examples
Ovicell hyperstomial (i.e. prominent), often becoming subimmersed by secondary calcification during ontogeny, completely calcified ectooecium with conspicuous frontal pseudopores, not closed by autozooidal operculum.
2015 October 22, “Diversity and Systematics of Schizomavella Species (Bryozoa: Bitectiporidae) from the Bathyal NE Atlantic”, in PLOS ONE