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Mollusca - Rostroconchs | The Phylum Mollusca is a large and varied invertebrate group within the Animal Kingdom. They are characterized by a soft body with a strong muscular foot and usually (but not always) covered by a shell. The Rostroconchs are a small and relatively obscure Class of mollusks characterized by a bivalved appearance but lack a hinge as true bivalves do. They arose in the Cambrian but did not survive the end Permian extinction event. In the Finis rostrochonchs are small and not common but the two known genera, especially the Pseudobiglea can be found with diligent searching of matrix. Scroll through images or click to enlarge. Fossils are in alphabetical order by Genus. Collections are from Mike DeBrock (MD), Josh Hanley (JH), Dr. Peter Holterhoff (PH), Mark McKinzie (MM), John McLeod (JM), ), Dr. Ben Neuman (BN), Bob Williams (BW), Sveta Earnest (SE), and Rodney Wise (RW). All scales are shown in millimeters unless otherwise noted. |
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Images | Taxonomy/Stratigraphy/ | Images | Taxonomy/Stratigraphy/ |
Kingdom: Animalia Phylum:Mollusca Class: Rostroconchia Order: Conocardiida Family: Bransoniidae Genus: Apotocardium Species: A. lanterna Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum:Mollusca Class: Rostroconchia Order: Conocardiida Family: Pseudobigaleaidae Genus: Pseudobigalea Species: P. crista Finis Shale, Graham Formation Lost Creek Cemetery, Jacksboro, TX Collection: MD |
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