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Tryblidiidae
Tryblidiidae is an extinct family of paleozoic monoplacophorans in the superfamily Tryblidioidea. Genera Genera in the family Tryblidiidae include: * ''Tryblidium'' Gustaf Lindström, Lindström, 1880. From Ordovician and Silurian.W. H. Dall, Dall W. H. 1913. ''Gastropods''. In: Charles Rochester Eastman, Eastman C. R. ''Text Book of Paleontology edited by C. R. Eastman adapted from German of K. A. von Zittel, 2nd edition revised and enlarged by the editor in collaboration with the following named specialists: R.S. Bassler, W. H. Dall, Charles Doolittle Walcott, C. D. Walcott.'Volume 1 MacMillan & Co., London. xii + 839 ppPage 521 * ''Drahomira'' Perner, 1903 ** ''Drahomira barrandei'' ** ''Drahomira glaseri'' ** ''Drahomira kriziana'' ** ''Drahomira rugata'' * ''Helcionopsis'' Ulrich & Scofield, 1897 * ''Pentalina (mollusc), Pentalina'' Horný, 1961 ** ''Pentalina prantli'' Horný, 1961 * ''Pilina'' References Prehistoric monoplacophorans Prehistoric mollusc families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monoplacophora
Monoplacophora , meaning "bearing one plate", is a polyphyletic superclass of molluscs with a cap-like shell inhabiting deep sea environments . Extant representatives were not recognized as such until 1952; previously they were known only from the fossil record, and were thought to have become extinct 375 million years ago. Although the shell of many monoplacophorans is limpet-like in shape, they are not gastropods, nor do they have any close relation to gastropods. Definition Discussion about monoplacophorans is made difficult by the slippery definition of the taxon; some authors take it to refer to all non-gastropod mollusks with a single shell, or all single-shelled mollusks with serially repeated units; whereas other workers restrict the definition to cap-shaped forms, excluding spiral and other shapes of shell. The inclusion of the gastropod-like Bellerophontoidea within the group is also contentious. One attempt to resolve this confusion was to separate out the predom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
