Fig. 7 in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 7. Successive transversal sections showing development of lonsdaleoid dissepiments in two corallites of rugose coral Catactotoechus instabilis Berkowski, 2008, Hamar Laghdad (Morocco), Emsian. A. Specimen UAM Tc/B HD3/200; A1, juvenile stage of growth showing interaction with auloporoid coral; note dissepiment on this side; A2, next stage showing one row of lonsdaleoid dissepiment−extension phase of growth; A3, mature stage of growth showing increase in development of dissepiments in constriction phase of growth; note that diameter of central lumen (aulos) is narrowed. B. Specimen UAM Tc/B HD3/201; B1, constriction phase of growth showing irregular lonsdaleoid dissepiments narrowing septal area; note invaginations of dissepiment in places where septal crests are formed; B2, extension phase of growth showing decrease of lonsdaleoid dissepimentarium and expansion of septal area.