An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

CORRUGATE   Folded or ridged on the surface; broadly or heavily sculptured with FOLDS.

GROWTH RUGA   Irregular wrinkle on surface of shell, of similar origin to growth line, but corresponding to more pronounced hiatus in growth; see also: RUGA.

(pl. RUGAE)
  An irregular fold in the surface SCULPTURE.

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