crinoid


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Related to crinoid: class Crinoidea, Sea lilies

crinoid

any echinoderm of the class Crinoidea, including the present-day feather stars and sea lilies. They are common fossils from the CAMBRIAN PERIOD throughout geological history, and are mainly sedentary. Antodon is free-living in British waters.
References in periodicals archive ?
By using this approach, members of the Bmp, TGF-beta, and Hox gene families were found to be associated with arm regeneration in the crinoids Antedon bifida and Antedon mediterranea (Thorndyke et al.
The shale also contains bryozoans, orthoconic cephalopods, rare crinoids and conulariids.
Such rapid regeneration has also been reported for the disk of other brittlestars (Dobson, 1988) and for the intestine of the crinoid Antedon mediterranea (Mozzi et al.
These larvae subsequently develop into nonfeeding doliolaria larvae, resembling the larvae of most crinoids (Lacalli, 1993).
This conclusion is also supported by the sedimentologic data, wich show a greater content of filaments (more typical in Callovian deposits) in the lower interval, and a greater content in sponge spicules and crinoid bioclasts in the upper interval (cfr.
Studies of modern crinoids have shown that biotic interactions are common in crinoid populations and involve a diverse suite of macro- and microorganisms (e.
The specimens studied come from a packstone bed cropping out near the waterline of the Serga River, with a high content (60%) of crinoid stem fragments.
If their crinoid ancestors spent their entire adult lives similarly anchored to one spot, they could not have spread worldwide without help.
Although most crinoid fossils are from "spindly, plant-like animals anchored to sea floor rocks," the 1 to 4 millimeter star-shaped parts of these crinoids that the scientists dug up were used to grab and hold onto objects but were not found attached to anything.
Inspect them closely and you may make out the curve of a gastropod, the cone-shaped shell of a cephalopod, or a disc or rod-like structure that was once a piece of a crinoid stem.
Morgan presents a guide for students and researchers in invertebrate paleontology and for collectors to the more than 60 valid species that encompass at least 40 genera and represent all the major crinoid groups of Mississippian Age: both primitive and advanced cladids, camerates, flexibles, and disparids.
Biochemical and energetic composition of bathyal achinoids and an asteroid, holothuroid and crinoid from the Bahamas.