crinoid

How To Use crinoid In A Sentence

• In these, as in the Crinoids, the interambulacral plates are absent, and the interambulacral spaces are filled by an encroachment of the ab-oral region upon them. The Atlantic Monthly, Volume 10, No. 57, July, 1862
• A typical marine community consisted of these animals, plus red and green algae, primitive fish, cephalopods, corals, crinoids, and gastropods.
• This analysis is a first step in reconstructing the details of possible evolutionary relationships among primitive cladid crinoids.
• The presence of other specialized benthos at the crinoid-bearing localities indicates that the ocean bottom locally was not fully anoxic.
• In eastern Mongolia late Permian marine sediments with brachiopods, crinoids and Bryozoa and Triassic marine sediments with ammonites occur in the suture zone, indicating that marine conditions existed during these times.
• Recent crinoids are passive suspension feeders on microscopic plant and animal plankton and organic detritus by means of the tubefeet of the water vascular system in their arms and pinnules.
• This stalked crinoid lacks arms, has a disc-shaped aboral cup that is at least five times wider than high, and has the anal opening in the aboral cup.
• Later Paleozoic seas were dominated by crinoid and blastoid echinoderms, articulate brachiopods, graptolites, and tabulate and rugose corals. Paleozoic
• The Permian extinction, 244 million years ago, devastated the marine biota: tabulate and rugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites. Paleozoic
• The fossil content consists of ammonites, belemnites, brachiopods, echinoderms, bivalves, crinoids, gastropods, ostracodes and benthic foraminifers.