On some “ Hemicyclopora ” Norman, 1894 and “ Escharella ” Gray, 1848 species (Bryozoa, Cheilostomatida) from the Atlantic-Mediterranean region. Re-examination of their generic status and description of new species and a new genus Author Harmelin, Jean-Georges Station marine d’Endoume (SME), Observatoire des Sciences de l’Univers (OSU) Pytheas, Institut méditerranéen d’Océanologie (MIO), Groupement d’Intérêt scientifique (GIS) Posidonie, Aix-Marseille University, F- 13007 Marseille (France) jean-georges. harmelin @ univ-amu. fr / jg. harmelin @ gmail. com harmelin@gmail.com Author Rosso, Antonietta Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Corso Italia 57, I- 95129, Catania (Italy) and Consorzio Interuniversitario per le Scienze del Mare (CoNISMa), Piazzale Flaminio, 9, I- 00196, Roma (Italy) rosso @ unict. it rosso@unict.it text Zoosystema 2023 2023-06-15 45 10 373 407 journal article 56126 10.5252/zoosystema2023v45a10 4d32642b-0df5-4b2d-9608-a90ce88347ab 1638-9387 8056122 urn:lsid:zoobank.org:pub:370E4D0A-FF10-4CAC-AF9F-A1A866FC1BEB Species complex 4: “ similis ” A set of Mediterranean and Atlantic specimens with a common range of morphological traits constitutes a species complex displaying a remarkable example of a morphological cline. Three geographically separated morphotypes, differing mainly in the structure of their orifice, are considered to be different species, two of which being new to science. The orifice structure of these species poses the fundamental question of the boundary between the genera Escharella and Hemicyclopora .