R . C . Moore, in Moore, Lalicker, and Fischer, 1952, " Invertebrate Fossils ", gives a practical and useful classification of pelecypods ( Bivalvia ) even if somewhat antiquated, based on shell structure, gill type, and hinge teeth configuration.
32.
During the Mississippian, Missouri was home to fairly abundant ammonoids, abundant " Archimedes " screws, very abundant blastoids, abundant lacy bryozoans, tabulate corals, tetracorals, endothyroid foraminferans, a moderate number of nautiloids, fairly abundant pelecypods, fairly abundant trilobites, abundant worms.
33.
Thread-sail filefish feed on fish, amphipods, isopods, cirripeds, polychaetes, pelecypods, seaweeds such as those of the genus " Sargassum "; and gelatinous plankton, such as the moon jellyfish " Aurelia sp " . and the giant jellyfish " Nemopilema nomurai ".
34.
The common fossils include plants ( Actinophyllum, Chondrites ), ostracods, phyllocarids, eurypterids, trilobites ( less common than in the older groups ), numerous brachiopods ( " Lingula minima ", " Chonetes striatella " ), gasteropods, pelecypods and cephalopods ( " Orthoceras bullatum " ).
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