Secondary chamberlets in Cycloclypeus
Scripta Geologica , Volume 7 p. 1- 35
Graphs, showing the relation of the primary chambers to the number of their secondary chamberlets, demonstrate that Tan's nepionic mutants are variable, even in the course of a short period. The evolutionary change of the nepionic mutants is consistent with the evolutionary change of Cycloclypeus as a whole. The number of secondary chamberlets of the first neanic chamber is considered a valuable characteristic for the identification of species. Reduction of the number of nepionic chambers in the course of time is thought to result from the occurrence of 'transitional nepionic variants'.
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O'Herne, L. (1972). Secondary chamberlets in Cycloclypeus. Scripta Geologica, 7, 1–35.