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Dendrasteridae
Dendrasteridae is a family of echinoderms belonging to the order Clypeasteroida Sand dollars (also known as sea cookies or snapper biscuits in New Zealand and Brazil, or pansy shells in South Africa) are species of flat, burrowing sea urchins belonging to the Order (biology), order Clypeasteroida. Some species within the or .... Genera: * '' Dendraster'' Agassiz, 1847 * '' Merriamaster'' * '' Orchoporus'' References Clypeasteroida Echinoderm families {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendraster
''Dendraster'' is a genus of sand dollars of the family Dendrasteridae within the order Clypeasteroida. The extant species in this genus are found in the northeast Pacific Ocean from Alaska to Baja California.Mooi, R. (1997). Sand Dollars of the genus Dendraster (Echinoidea: Clypeasteroida): Phylogenetic systematics, heterochrony, and distribution of extant species.' Bulletin of Marine Species 61(2): 343–375. The best-known, most common and widespread species is '' D. excentricus''. Species Listed alphabetically. *'' Dendraster ashleyi'' (Arnold) † *'' Dendraster casseli'' Grant & Hertlein, 1938 † *'' Dendraster elsmerensis'' Durham, 1949 † *''Dendraster excentricus ''Dendraster excentricus'', also known as the eccentric sand dollar, sea-cake, biscuit-urchin, western sand dollar, or Pacific sand dollar, is a species of sand dollar in the family Dendrasteridae. It is a flattened, burrowing sea urchin found ...'' (Eschscholtz, 1831) *'' Dendraster gibbsii'' (Remond) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrasteridae
Dendrasteridae is a family of echinoderms belonging to the order Clypeasteroida Sand dollars (also known as sea cookies or snapper biscuits in New Zealand and Brazil, or pansy shells in South Africa) are species of flat, burrowing sea urchins belonging to the Order (biology), order Clypeasteroida. Some species within the or .... Genera: * '' Dendraster'' Agassiz, 1847 * '' Merriamaster'' * '' Orchoporus'' References Clypeasteroida Echinoderm families {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clypeasteroida
Sand dollars (also known as sea cookies or snapper biscuits in New Zealand and Brazil, or pansy shells in South Africa) are species of flat, burrowing sea urchins belonging to the Order (biology), order Clypeasteroida. Some species within the order, not quite as flat, are known as Sea biscuit (echinoderm), sea biscuits. Sand dollars can also be called "sand cakes" or "cake urchins". Names The term "sand dollar" derives from the appearance of the Test (biology), tests (skeletons) of dead individuals after being washed ashore. The test lacks its velvet-like skin of spines and has often been bleached white by sunlight. To beachcombers of the past, this suggested a large, silver coin, such as the old Spanish dollar, which had a diameter of 38–40 mm. Other names for the sand dollar include ''sand cakes, pansy shells, snapper biscuits, cake urchins'', and ''sea cookies''. In South Africa, they are known as ''pansy shells'' from their suggestion of a five-petaled pansy, garden f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinoderms
An echinoderm () is any animal of the phylum Echinodermata (), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". 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 ocean depth from the intertidal zone to the abyssal zone. The phylum contains about 7,600 living species, making it the second-largest group of deuterostomes after the chordates, as well as the largest marine-only phylum. The first definitive echinoderms appeared near the start of the Cambrian. Echinoderms are important both ecologically and geologically. Ecologically, there are few other groupings so abundant in the deep sea, as well as shallower oceans. Most echinoderms are able to reproduce asexually and regenerate tissue, organs and limbs; in some cases, they can undergo compl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
