Type species: Porina pachyderma Marsson, 1887
Diagnosis: Colony erect, bilamellar, branching. Thickly calcified, zooidal boundaries not frontally evident, the surface densely dimpled. Zooidal peristomes arranged quincuncially, associated with one or more adventitious avicularia with crossbars. Larger spatulate avicularia also present. A single proximal spiraminal pore proximal to orifice, small, non-projecting, opening into umbonuloid shield proximal to base of peristomial shaft. In older parts of colonies peristomes and avicularia concealed by secondary calcification, forming nodularities. (Gordon, 2002)
This genus includes the species:
Koromyslova & Pakhnevich, 2016 | Late Cretaceous Campanian | Belarus | WoRMS 1406113 | |
(Marsson, 1887) | Late Cretaceous Maastrichtian | Germany | WoRMS 1412666 |