| In the echinoid gene order, the tRNA gene cluster follows the putative control region. |
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| This implies that the ancestral polarity of the 4.6-kb inversion is the echinoid pattern. |
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| Despite the astonishing abundance of echinoid spines in the coral reef horizon, echinoid tests were not found here. |
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| The gastropod assemblage suggests an Albian age and the echinoid assemblage reportedly indicates a late Albian age. |
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| The remaining carbonate bioclasts are exclusively calcitic echinoid spines, rare foraminifera, molluscs and bryozoan fragments. |
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| Interspersed among the archaeocidarids are three less common echinoid species as well as occasional crinoids, brachiopods, bryozoans, and rare edrioasteroids and asterozoans. |
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| As discussed above for the genus, this echinoid is interpreted to have lived upright as epibenthos, with the long axis perpendicular to the substrate. |
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| Magnesium distribution in living and fossil specimens of the echinoid Perunella lasueuri Agassiz, Shark bay, Western Australia. |
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| Most echinoid fossils are often abundant in the restricted localities and formations where they occur. |
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| Bioclasts are composed of benthic foraminifera, various-sized bivalve fragments, radiolaria, echinoid fragments, bryozoa and pelagic fossils. |
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| The occurrence of the sand dollar echinoid Periarchus lyelli in the Upper Eocene Caddell Formation of Texas is confirmed. |
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| Effect of feeding on cadmium bioaccumulation in the echinoid Paracentrotus lividus. |
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| Recently discovered elements include ophioroid fragments and echinoid spines. |
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| Biosynthesis of estrogen derivatives in the echinoid Lytechinus variogatus Lamarck. |
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| During the upper part of the Carboniferous period, a marked decline in echinoid diversity occurred, and this trend continued to the Permian period. |
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| Echinoid and crinoid fragments are preserved on a number of bedding planes, indicating normal salinity levels. |
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