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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