Fig. 11 in New Barremian rhynchonellide brachiopod genus from Serbia and the shell microstructure of Tetrarhynchiidae

Fig. 11. Rhynchonellide brachiopod Antulanella pancici (Antula, 1903), Barremian, Crnoljevica, Svrljiške Planine Mountains, eastern Serbia. A. SEM micrographs of transverse sections of the shell RGF VR 25/310. A1. Section through two ribs, sulci and euseptoidum; preserved primary layer (pl) and secondary layer (sl) overgrown with diagenetic calcite prisms (dcp). A2. Section showing modified fibres of the euseptoidum. A3. Hinge plate (hp) and crural base (cb). B. SEM micrographs of transverse sections of the shell RGF VR 24/61. B1. Hinge plate (hp) and crural base (cb). B2. Right tooth (t), inner socket ridge (isr) and outer socket ridge (osr). B3. Close−up of fibres of hinge tooth from the area arrowed in B2 showing also slight diagenetic fusion of the fibrous elements.