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exocyathoid expansion (ex-o-cy'-a-thoid). Growth of an additional intervallum in an archaeocyathid cup, which appears to have had an adherent function (TIP, 1972, pt. E, p.7).
exocyathoid expansion (ex-o-cy'-a-thoid). Growth of an additional intervallum in an archaeocyathid cup, which appears to have had an adherent function (TIP, 1972, pt. E, p.7).