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  2. Ammonoidea - Wikipedia

    en.wikipedia.org/wiki/Ammonoidea

    Fossil of Parapuzosia seppenradensis, one of the largest known ammonites. The smallest ammonoid was Maximites from the Upper Carboniferous. Adult specimens reached only 10 mm (0.39 in) in shell diameter. [36] Few of the ammonites occurring in the lower and middle part of the Jurassic period reached a size exceeding 23 cm (9.1 in) in diameter.

  3. Ammolite - Wikipedia

    en.wikipedia.org/wiki/Ammolite

    Ammolite comes from the fossil shells of the Upper Cretaceous disk-shaped ammonites Placenticeras meeki and Placenticeras intercalare, and (to a lesser degree) the cylindrical baculite, Baculites compressus. Ammonites were cephalopods, that thrived in tropical seas until becoming extinct along with the dinosaurs at the end of the Mesozoic era.

  4. Crioceratites - Wikipedia

    en.wikipedia.org/wiki/Crioceratites

    A rare heteromorph ammonite fossil from the south of France. The species is Crioceratites nolani and the spines have been partially restored to show how it might have appeared in life Crioceratites is an ammonite genus from the Early Cretaceous belonging to the Ancyloceratoidea .

  5. List of ammonite genera - Wikipedia

    en.wikipedia.org/wiki/List_of_ammonite_genera

    This list of ammonites is a comprehensive listing of genera that are included in the subclass †Ammonoidea, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well as those that may be invalid or doubtful ( nomina dubia ), or were not formally published ( nomina nuda ), as well as junior ...

  6. Dactylioceras - Wikipedia

    en.wikipedia.org/wiki/Dactylioceras

    Dactylioceras was a widespread genus of ammonites from the Lower Jurassic period, [1] approximately 180 million years ago . [2] and Like many other ammonites, the genus Dactylioceras is extremely important in biostratigraphy, being a key index fossil for identifying their region of the Jurassic. It had a nearly cosmopolitan distribution during ...

  7. Acanthoceras (ammonite) - Wikipedia

    en.wikipedia.org/wiki/Acanthoceras_(ammonite)

    Acanthoceras fossils have been found in Australia, Brazil, Bulgaria, Colombia (Hondita Formation, ... Acanthoceras (ammonite) 9 languages ...

  8. Ancyloceras - Wikipedia

    en.wikipedia.org/wiki/Ancyloceras

    Ancyloceras ammonites have a shell reaching a length of about 10 centimetres (3.9 in) and a width of about 7 centimetres (2.8 in). They are known as heteromorph shaped, with a partly uncoiled shell and the aperture directed toward the coiled part.

  9. Parapuzosia seppenradensis - Wikipedia

    en.wikipedia.org/wiki/Parapuzosia_seppenradensis

    Parapuzosia seppenradensis is the largest known species of ammonite. [1] It lived during the Lower Campanian Epoch of the Late Cretaceous period, in marine environments in what is now Westphalia, Germany. A specimen, found in Seppenrade near Lüdinghausen, Germany in 1895 measures 1.8 m (5.9 ft) in diameter, although the living chamber is ...