While bilaterally symmetrical as larvae, as adults echinoderms are recognisable by their usually five-pointed radial symmetry (pentamerous symmetry), and are found on the sea bed at every …

2025年2月7日 · Living echinoderms have a conspicuous five-rayed, radial symmetry that masks their fundamental bilateral symmetry. The skeleton is dermal and each skeletal unit consists of …

2019年10月4日 · An echinoderm is a member of the phylum Echinodermata which contains a number of marine organisms recognized by their pentamerous radial symmetry, calcareous …

2024年11月23日 · Echinoderms live exclusively in marine systems; they are widely divergent, with over 7,000 known species in the phylum. Echinoderms have pentaradial symmetry and a …

2023年8月3日 · Symmetry usually radial, nearly always pentamerous. The body is triploblastic, coelomate with distinct oral and aboral surfaces, and without definite head and segmentation. …

Echinoderms have a spiny endoskeleton. They have radial symmetry as adults but bilateral symmetry as larvae. Echinoderms have a unique water vascular system with tube feet. This …

2024年10月2日 · Phylum Echinodermata encompasses marine organisms characterized by a calcareous endoskeleton, pentamerous radial symmetry in adulthood, and a specialized water …