Echinoidea

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Echinoidea

[‚ek·ə′noid·e·ə]
(invertebrate zoology)
The sea urchins, a class of Echinozoa having a compact body enclosed in a hard shell, or test, formed by regularly arranged plates which bear movable spines.
References in periodicals archive ?
Alternatively, given that relatively few echinoplutei have been cultured to metamorphosis, arm flexing and the associated increase in the complexity of larval musculature could be distributed among several echinoid lineages.
Reproductive periodicity of the echinoids Diadema and Echinometra on the two coasts of Panama.
Local or random movement has been observed in previous movement studies of echinoids (Dumont et al.
Diademasetosum (Leske, 1778) (Echinometra: Echinoidea: Diadematidae) also known as long-spined black sea urchin, is one of the most common echinoids that widely distributed in the Indo-West Pacific Ocean especially in coral ecosystems,and have profound biological, ecological and aquacultural significance (Lessios et al.
Agassiz, 1863, Lytechinus variegatus (Lamarck, 1816), Tripneustes ventricosus (Lamarck, 1816), and Diadema antillarum Philippi, 1845, are the most common littoral echinoids in the Caribbean.
Like other echinoids that have been tested, purple sea urchins probably can tolerate, for hours or days, mild to moderate hypoxia (> 0.
The sand dollar echinoid Periarchus lyelli (Conrad) is a distinctive and well-known element of the fauna of Upper Eocene (Jackson) marls and limestones across the eastern Gulf of Mexico and lower Atlantic coastal plain.
Trophic relationships of macrofauna within a Jamaican seagrass seagrass meadow and the tole of the echinoid Lythechinus variegatus (Lamarck).
These included the common echinoid Clypeaster cotteaui and two species of scallops assigned to the genus Chlamys, including the common C.
The ecology of fertilization of echinoid eggs: the consequences of sperm dilution, adult aggregation, and synchronous spawning.
Whatever the exact cause, its main consequence is that echinoid populations throughout the Aleutian Islands contain numerous individuals in the size range of 5-35 mm test diameter.