brachiopod


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brachiopod

any marine invertebrate animal of the phylum Brachiopoda, having a ciliated feeding organ (lophophore) and a shell consisting of dorsal and ventral valves
References in periodicals archive ?
27 species f rom 13 genera regarding Late Permian brachiopod s were recognized in the present research work, Theost significant brachiopod families, in terms of frequency and variety, included Productida, Strophomenida, Rhynconellida and Athyris.
Brachiopods are numerous and well preserved there, making them an ideal group of animals to test the link between abundance and extinction.
3) It is possible that the larvae of these inarticulate brachiopods suvived by becoming attached to the firm substrate of the bivalve shell.
1 is different from the columnar structure of acrotretoid brachiopod shells (Williams & Holmer 1992), as well as from that of Mickwitzia shells (Skovsted & Holmer 2003), where columns penetrate initially organic-rich layers.
In contrast, brittle stars and brachiopods were dense in low-relief mixed rock but rare or absent in low-relief mixed sediment.
Mississippian brachiopod biostratigraphy and the Osagean-Meramecian boundary in south-sentral Indiana.
The appearance of brachiopod shells is similar to that of bivalves; however, brachiopods are different anatomically from bivalves and are considered to be unrelated evolutionarily to Mollusca (Pennington & Stricker 2001).
The central slit visible in your mould represents a prominent central ridge characteristic of pentamerid brachiopod shells, which served as an attachment point for strong muscles that opened and closed the shells.
girardeauensis is restricted to strata that contain a latest Ordovician, Hirnantian, brachiopod fauna (Amsden and Barrick, 1986).
One can find the phosphatic Obolus sandstone, including brachiopod bivalves and fragments, radioactive alum shale, glauconite-rich gray bentonite clay and glauconitic sandstone.