Description:
Observed condition of tissue over the costal ridges (extensions of the septa of the corallite); 0 = none; tissue over costae intact; 1 = a few gaps noted; 2 = 1/4 of costae exposed; 3 = 1/2 of costae exposed; 4 = 3/4 of costae exposed; 5 = Most costae exposed; tissues attenuated; retracted