Abstract Bryozoan material from the Ferques Formation (Upper Devonian, Frasnian), Boulonnais, France contains two cystoporates Cystiramus cf. kondomensis Morozova, 1959 and Canutrypa francqana Bassler, 1952, a new trepostome species Dyoidophragma bigeye n. sp., as well as two fenestrates Hemitrypa sp. and Anastomopora inflata (Bigey, 1988b). The revised diagnosis of the genus Dyoidophragma Duncan, 1939 is suggested. The species composition reveals palaeobiogeographic relations to the Middle and Upper Devonian of Belgium, Germany and Poland, as well as possible relation to the Upper Devonian of Kuznetsk Basin in Russia.
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Ernst et al. (2024) studied this question.
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