Fig. 8
a–dSychnoelasma urbanowitschi (Stuckenberg): a DPM BMW1-12, T.S., b DPM BMW1-15, T.S., c DPM BMW1-19, T.S., d Septal fibrous microstructure; e, i, jCravenia lamellata Howell: e DPM BMW1-23, T.S., i Water-jet fibrous septum, j Fibrous inner border of septum; fCravenia tela Hudson DPM BMW2-5, T.S.; g–hCravenia rhytoides Hudson: g DPM BMW1-4, T.S., h DPM BMW1-4 lamellar microstructure at the wall. Black arrows indicate the position of the cardinal septum