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Placodont

Placodonts ("Tablet teeth") were a group of marine reptiles that lived during the Triassic period, becoming extinct at the end of the period. It is believed that they were related to the Sauropterygia, the group that includes Plesiosaurs. Placodonts were generally between one to two metres in length, with some of the largest measuring three metres long. Image File history File links This is a lossless scalable vector image. ... The Triassic is a geologic period that extends from about 251 ± 0. ... Image File history File links Metadata Size of this preview: 422 × 599 pixelsFull resolution (566 × 804 pixel, file size: 841 KB, MIME type: image/jpeg) Reconstructions of the placodonts Placodus, Paraplacodus, and Cyamodus, of Triassic Europe. ... Species (type) Placodus was a genus of 2. ... Species (Münster, 1839) (type) (Agassiz, 1833-45) Gürich, 1884 Peyer, 1931a Nosotti & Pinna 1993 Cyamodus was a Placodont, known from fossil remains discovered in Germany, in the early-to-mid 1800s and was named by Christian Erich Hermann von Meyer, in 1863. ... Paraplacodus was a Placodont from the middle Triassic period, during the Anisian to Ladinian stages. ... Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. ... For other uses, see Animal (disambiguation). ... Typical Classes See below Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates. ... Subclasses Anapsida Diapsida Synonyms Reptilia Laurenti, 1768 Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class Sauropsida. ... Groups ?Placodontia Pachypleurosauridae Nothosauridae    Plesiosauria Sauropterygia (lizard flippers) is a group of very successful aquatic reptiles that flourished during the Age of the Dinosaurs before they became extinct. ... Edward Drinker Cope Edward Drinker Cope (July 28, 1840–April 12, 1897) was an American paleontologist and comparative anatomist, as well as a noted herpetologist and ichthyologist. ... Paraplacodus was a Placodont from the middle Triassic period, during the Anisian to Ladinian stages. ... Species (type) Placodus was a genus of 2. ... Binomial name von Huene, 1936 Henodus chelyops (Turtle-Faced Single Tooth) was a placodont of the Late Triassic period during the Carnian stage. ... Species (Münster, 1839) (type) (Agassiz, 1833-45) Gürich, 1884 Peyer, 1931a Nosotti & Pinna 1993 Cyamodus was a Placodont, known from fossil remains discovered in Germany, in the early-to-mid 1800s and was named by Christian Erich Hermann von Meyer, in 1863. ... GFDL Wikispecies logo File links The following pages link to this file: Solanaceae Species Asterias Homo (genus) Human Wikipedia:Template messages/Links Wikipedia:Template messages/All Homo floresiensis User talk:Tuneguru Template:Wikispecies Categories: GFDL images ... Wikispecies is a sister project supported by the Wikimedia Foundation that anybody can edit with a great potential use to students and researchers. ... This article or section does not adequately cite its references or sources. ... Types of teeth Molars are used for grinding up foods Carnassials are used for slicing food. ... Orders  Crocodilia - Crocodilians scary crocodiles. ... The Triassic is a geologic period that extends from about 251 ± 0. ... Groups ?Placodontia Pachypleurosauridae Nothosauridae    Plesiosauria Sauropterygia (lizard flippers) is a group of very successful aquatic reptiles that flourished during the Age of the Dinosaurs before they became extinct. ... Plesiosaurs extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous period, they are best known for killing Fred Flintstone. ...

In appearance, many resembled stout- or barrel-bodied newts, or lizard, while others looked more turtle-like due to large bony plates on their backs. They had short limbs and were highly robust. Diversity ca. ...

Because of their dense bone and heavy armour plating, these creatures would have been too heavy to float in the ocean and would have used a lot of energy to reach the water surface. For this reason and because of the type of sediment found accompanying fossils it is suggested they lived in shallow waters and not in deep oceans.

Their diet consisted of marine bivalves, brachiopods, and other invertebrates. They were notable for their large, flat, often protruding teeth which they used to crush molluscs and brachiopods, which they hunted on the sea bed (another way in which they were similar to walruses). The Palate teeth were extremely thick and large enough to crush thick shell. Orders Subclass Protobranchia Solemyoida Nuculoida Subclass Pteriomorphia - oysters Arcoida Mytiloida Pterioida Subclass Paleoheterodonta - mussels Trigoinoida Unionoida Subclass Heterodonta - clams, zebra mussels Veneroida Myoida Subclass Anomalosdesmata Pholadomyoida Animals of the Class Bivalvia are known as bivalves because they typically have two-part shells, with both parts being more or less symmetrical. ... Classes Lingulata Paterinata (extinct) Craniforma Chileata (extinct) Obolellata (extinct) Kutorginata (extinct) Strophomenata (extinct) Rhynchonellata Brachiopods (from Latin bracchium, arm + New Latin -poda, foot) make up one of the major animal phyla, Brachiopoda. ... Types of teeth Molars are used for grinding up foods Carnassials are used for slicing food. ... Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ...

The first specimen was discovered in 1830, and they have since been discovered throughout Europe and the Middle East. World map showing the location of Europe. ... A map showing countries commonly considered to be part of the Middle East The Middle East is a region comprising the lands around the southern and eastern parts of the Mediterranean Sea, a territory that extends from the eastern Mediterranean Sea to the Persian Gulf. ...

Classification

• Class Sauropsida
  • Superorder Sauropterygia
    • ORDER PLACODONTIA
      • Genus Saurosphargis
      • Family Paraplacodontidae
        • Genus Paraplacodus
      • Family Placodontidae
        • Genus Placodus
      • Superfamily Cyamodontoidea
        • Family Henodontidae
          • Genus Henodus
        • Family Cyamodontidae
          • Genus Cyamodus
        • Genus Protenodontosaurus
        • Family Placochelyidae
          • Genus Placochelys
          • Genus Psephoderma

Superclasses Anapsida Eurapsida Diapsida Reptilia was an old kingdom or phylum classification that has since been divided into 4 classes. ... Groups ?Placodontia Pachypleurosauridae Nothosauridae    Plesiosauria Sauropterygia (lizard flippers) is a group of very successful aquatic reptiles that flourished during the Age of the Dinosaurs before they became extinct. ... Paraplacodus was a Placodont from the middle Triassic period, during the Anisian to Ladinian stages. ... Species (type) Placodus was a genus of 2. ... Binomial name von Huene, 1936 Henodus chelyops (Turtle-Faced Single Tooth) was a placodont of the Late Triassic period during the Carnian stage. ... Species (Münster, 1839) (type) (Agassiz, 1833-45) Gürich, 1884 Peyer, 1931a Nosotti & Pinna 1993 Cyamodus was a Placodont, known from fossil remains discovered in Germany, in the early-to-mid 1800s and was named by Christian Erich Hermann von Meyer, in 1863. ... Placochelys (flat-plate turtle) is an extinct genus of anapsid reptile from the Triassic period. ... Species (type) Meyer, 1867 Psephoderma is a genus of placodont that was very similar to its relatives Placochelys and Cyamodus. ...

External links

• http://www.oceansofkansas.com/placodnt.html
• http://users.unimi.it/vertpal/galleriafossili/best-retilli/PSEPHODERMAMORFFUNZ.html
• http://rainbow.ldgo.columbia.edu/courses/v1001/9.html
• http://palaeos.com/Vertebrates/Units/220Lepidosauromorpha/220.100.html#Placodontia
• Oceans of Kansas Palaeontology Mike Everhart