| 词汇 | umbonal |
| 语种 | 英语、汉语、英汉翻译、汉英翻译 |
| 释义 | umbonal adjective biology specializeduk /ʌmˈbəʊ.nəl/ us /ʌmˈboʊ.nəl/(alsoumbonate) having or relating to the umbo of a shell (= a raised, rounded part where the two shells of a mollusc join): The shell has rounded, irregular ribs, with a weak ventral median groove originating in the umbonal region. In the study of bivalves, it is often necessary to break off the umbonal infilling. The shells are small, subtriangular in shape, with an umbonal angle of 100°. In the molluscs, morphology of the umbonal shell may reveal much concerning type of larvae. It has smooth, non-sulcate, asymmetrical and umbonate valves. Sea creatures abalone amphipod anemone barnacle barrier reef cowrie crab cray crayfish crustacean littleneck clam lobster marron mollusc mussel shellfish shipworm shrimp snow crab soft-shell clam |
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