Chasmatopora
Chasmatopora is an extinct genus of bryozoans which existed in what is now Mongolia, China, Estonia, Russia, Poland, Argentina, the United States and Canada. It was described by Alcide d'Orbigny in 1849, and the type species is Chasmatopora tenella, which was originally described as a species of Retepora by Eichwald in 1842.
Species
Chasmatopora aperta Kopajevich, 1984Chasmatopora disparilis Liu, 1980Chasmatopora extensa Liu, 1980 Chasmatopora flexa Zheng, 1990Chasmatopora livonica Chasmatopora moyeroensis Nekhoroshev, 1955Chasmatopora pusilla Astrova, 1965 Chasmatopora silurica Chasmatopora sublaxa Ulrich, 1890 Chasmatopora hypnoides Chasmatopora tenella Chasmatopora tricellata Chasmatopora rossae Ernst & Carrera, 2012