Chainodictyon, Foerste, 1887

Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara & Wyse Jackson, Patrick N., 2022, Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA, Palaeontologia Electronica (a 15) 25 (2), pp. 1-56 : 18

Genus CHAINODICTYON Foerste, 1887

Type species. Chainodictyon laxum Foerste, 1887 , by original designation. Pennsylvanian ( Upper Carboniferous ) ; USA, Ohio .

Diagnosis. Reticulate colonies, regularly anastomosing. Flattened branches bearing 3–12 rows of autozooecia. Vestibule weakly developed. Diaphragms rare. Hemisepta absent. Oval apertures arranged in a diagonal pattern. Autozooecial chambers rhombic in mid-tangential section. Styles absent. Leptozooecia common on the obverse surface of branches. Reverse wall very thin.

Remarks. Chainodictyon Foerste, 1887 , differs from Rhombocladia Rogers, 1900 , by having a reticulate colony form instead of a ramose one and by the absence of hemisepta. Chainodictyon differs from Kallodictyon Morozova, 1981 , in its development of a thin reverse wall and by absence of leptozooecia on the reverse surface of branches.

Occurrence. Mississippian of Kazakhstan and Russia, Pennsylvanian of USA, and Russia, and Lower Permian of Russia.