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单词 pentameral
释义

pentameral

/pɛnˈtamərəl /
adjective Zoology
(Of symmetry) fivefold, as typical of many echinoderms. Compare with pentamerous.The echinoderm body plan has pentameral symmetry, a water vascular system and a ring-shaped nervous system....
  • The most distinctive thing about echinoderm appearance is their pentameral - that is, a five fold - radial symmetry.
  • The distinctive pentameral symmetry of this specimen has no close similarity to figured articular facets of fossil and recent hyocrinids.

Derivatives

pentamerally

adverb ...
  • Pentamerally symmetric echinoderms are a bilaterian metazoan phylum whose members exhibit secondarily derived radial symmetry.
  • Some forms, such as the starfish, are pentamerally symmetrical, with five equal sides.

pentamery

noun ...
  • The other viewpoint is that the number of rays is intrinsically fixed at five, and therefore it is the deviations from pentamery that need explanation wherever they occur.
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更新时间:2025/3/22 17:10:04