adjectiveBotany & Zoology
1.1(Of a shell) having an umbilicus.
- The dominant taxa at that time (modal geometries C and D) had compressed, moderately to openly umbilicate shells with slowly expanding whorls, morphologies poorly exploited by Permian goniatitids.
- Modal geometries C and D appear to represent the tendency for these pioneers, i.e., slowly expanding, moderately to openly umbilicate, compressed shells, typified by Otoceras and Ophiceras.
- By contrast, a narrowly umbilicate and thin shell possesses slender and dense ornamentation.
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