 | Texas Pennsylvanian FossilsDedicated to the Study of Pennsylvanian Fossils, Sponsored by Members of the Dallas Paleontological Society |
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Cephalopods - Goniatites | 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 Cephalopods are a highly diversified, exclusively marine, Class of mollusks some of which possess an external shell (nautiloids, goniatites and ammonites) and others which no longer have an external shell (squid, octopus) but all of which have tentacles which are a modification of the molluscan foot. The cephalopod shell is a series of chambers connected by a tube (siphuncle) that are added as the animal grows. The last chamber is the living chamber. Clearly recognizable cephalopods were first seen in the Ordovician and the shelled forms became a dominant group in the Paleozoic. Today, shelled forms are very limited in variety and distribution, but the non-shelled forms are more widely dispersed. During the Pennsylvanian one group of cephalopods was the Order Goniatitida. This group is characterized by a coiled shell and the chambers are separated by more complex septa. Where the septa intersect the outer shell it forms a suture and the form of this suture is often diagnostic in species identification. The goniatitid sutures usually have smooth saddles and lobes or occasionally are zig-zag in shape. The goniatites went extinct at the end of the Permian. The Finis contains nearly four dozen forms of cephalopods and goniatites comprise a little over half of them. Goniatite fossils are fairly common, but nowhere near the volume of brachiopods or the larger mollusk groups. Among the goniatites, Eoasianites, Gonioloboceras, and Shistoceras, are genera that can commonly be found. ----------------------------------------------------------------------------------------------------------------------------------------- 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: Chordata Class: Cephalopoda Order: Goniatitda Family: Agathiceratidae Genus: Agithiceras Species: A. ciscoense Finis Shale, Graham Formation LCD and Cemetery, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Neoicoceratidae Genus: Eoasianites Species: E. angulatus Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Neoicoceratidae Genus: Eoasianites Species: E. globosus Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Neoicoceratidae Genus: Eoasianites Species: E. milleri Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Thalassoceratidae Genus: Eothalassoceras Species: E. caddoense Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Glaphyritidae Genus: Glaphyrites Species: G. jonesi Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Glaphyritidae Genus: Glaphyrites Species: G. modestus Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM Note: Formerly Eoasianites
| Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Gonioloboceratidae Genus: Gonioloboceras Species: G. goniolobum Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Marathonitidae Genus: Maranthonites Species: M. ganti Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM Note: Formerly Cardiella | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Pseudohalortidae Genus: Neoaganides Species: N. grahamense Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM Note: Formerly Imitoceras |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Neodimorphoceratidae Genus: Neodimorphoceras Species: N. texanum Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM,SE | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Schistoceratidae Genus: Paraschistoceras Species: P. missouriense Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM, RW |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitda Family: Wiedeyoceratidae Genus: Pennoceras Species: P. seamani Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: RW, BW, MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Schistoceratidae Genus: Schistoceras Species: S. hildrethi Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Shumarditidae Genus: Shumardites Species: S. cuyleri Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Vidrioceratidae Genus: Vidrioceras Species: V. uddeni Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM Note: Formerly Stacheoceras |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Prolecanitida Family: Daraelitidae Genus: Boesites Species: B. texanus Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Prolecanitida Family: Medlicottiidae Genus: Uddenities Species: U. schucherti Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Prolecanitida Family: Medlicottiidae Genus: Uddenities Species: U. sp. Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM | Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Prolecanitida Family: Medlicottiidae Genus: Uddenoceras Species: U. oweni Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: SE, RW Note: Formerly Uddenities |
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Goniatitida Family: Desc: Other Images of Goniatites Species: Finis Shale, Graham Formation Lost Creek Dam, Jacksboro, TX Collection: MM |
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