echinoid

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Related to echinoids: ophiuroids

echinoid

any of the ECHINODERMS of the class Echinoidea, including the sea urchins.
References in periodicals archive ?
comm.); this pattern is reminiscent of that for many echinoids with feeding larvae (e.g., Debenham et al., 2000; Duran et al., 2004; Banks et al., 2007).
Nejbert and Gladysz (2009) reported the occurrence of echinoids and inoceramids along with the foraminifera/calcispherefacies from deeper shelves of Late Cretaceous.
On the other side, other species less represented in the discards than on deck showed higher biomass in the sites CFE than in IFE during 2007, like some sea stars, the echinoids Gorgonocephalus chilensis and Austrocidaris canaliculata and the snail Fusitriton magellanicus.
The base of the Jahrum Formation consists of argillaceous limestone and medium bedded dolomitic limestone with abundant benthonic (Operculina spp.) and planctonic foraminifera and with echinoid debris, bivalve and bryozoans.
However, true hermatypic corals do not occur, and the biofacies is dominated by heterotrophic organisms (such as oysters, brachiopods, echinoids, solitary corals).
Temporal and spatial variation in egg size of 13 Panamanian echinoids. Journal of Experimental Marine Biology and Ecology 114:217-239.
1991), nonpelagic development is clearly the rule for antarctic echinoids. This group has been frequently revisited since Mortensen (1951; Pawson 1969; Dell 1972; Arnaud 1974; Schatt and Feral 1991; De Ridder et al.
Sexual conflict and polyspermy under sperm-limited conditions: in situ evidence from field simulations with a free-spawning marine echinoid Evechinus chloroticus.
Both correlative and experimental approaches have been used to investigate spawning triggers in echinoids (Himmelman 1975, 1978, Levitan 1988a, Starr et al.
The abundance of the allochem is greater than 10% mainly consisting of the shell fragments of bryozoans brachiopods echinoderms (echinoids and crinoids) algae and foraminifera (Plate 3D).
A Recent Increase in the Density of the Echinoid Diadema antillarum in Dominica (Lesser Antilles): 2001-2005.
Despite of the variable siliciclastic content (0 to 10%), the dominant facies consists of moderately burrowed, fine grained, wackestones with abundant planktic foraminifera, calcisphaerulids, ostracods, some small benthic foraminifera, and rests of inoceramids and echinoids.