Echinoidea

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Their work reveals that Clipsham limestone used to repair the Gothic parliament building since the 1920s includes the fossils of echinoids or sea urchins dating back to the Middle Jurassic period more than 160 million years ago.
azora in Riodinini is reinforced by the position of spiracles, presence of echinoid setae, and absence of tentacle nectary organs, which are all typical features of this tribe (Harvey, 1987; Kaminski, 2008).
The differential effects of seasonal stress and predation on the stability of reef-flat echinoid populations.
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.
Fossils that outline the shapes of a Trigonia clam and an echinoid were also taken from the pit.
Matrix is dominated by peloids, but contains tuberoids, other intraclasts, oncoids, thin-shelled bivalves, benthic foraminifera, smooth-walled ost racodes, echinoid spines, and gastropods, in approximate order of decreasing abundance.
Skeletal grains are formed as internal or external skeletal units of marine organisms, including crustose and articulate corallines, mollusc shells, forams, gastropods, algae, and echinoid fragments.
The limestone horizons are richly fossiliferous with abundant ammonites, pelecypods and echinoid remains.
11 9:20 HOLOTHUROID AND ECHINOID AGGREGATE BEHAVIOR ON THE EASTERN PACIFIC ABYSSAL PLAIN.
The skeletons of invertebrates include pelecypods such as small juvenile oysters and many other species of claros, gastropods, and brachiopods (rhynchonellids), echinoid spines and parts of brittle starfish, foraminifera, and thin elongate skeletal tubes of calcite (several centimetres long by only a couple of millimetres diameter) that may be from an unidentified tube worm.
These included the common echinoid Clypeaster cotteaui and two species of scallops assigned to the genus Chlamys, including the common C.
Westergren worked on crinoid and echinoid plates for Alexander Agassiz (1892; 1906; 1908), as well as Faxon's famous work on stalk-eyed crustaceans (Faxon, 1914).
It is Paleocene in age and associated with shallow marine environment due to abundance of coralline algae, gastropods, pelecypods, echinoid fragments and other skeletal debris.