Neolioceratoides

Neolioceratoides is genus of ammonites that lived during the Pliensbachian and Toarcian stages of early Jurassic.[1] It has been considered to be a synonym of Lioceratoides,[2][3] but cladistic analysis has shown, that this genus is not only valid, but they even belong to different subfamily, as Lioceratoides belongs to Harpoceratinae.[4] Their fossils were found in Europe[1] and northern Africa.[5]

Neolioceratoides
Temporal range: Pliensbachian–Toarcian [1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Hildoceratidae
Subfamily: †Hildoceratinae
Genus: †Neolioceratoides
Cantaluppi, 1970
Type species
Hildoceras (Lillia) hoffmanni
Gemmellaro, 1885
Species
  • N. hoffmanni Gemmellaro, 1885
  • N. durtalense Gabilly, 1976
  • N. avius Wiedenmayer, 1980
  • N. ballinensis Haas, 1913
  • N. beccarii Fucini, 1929
  • N. bellinii Gemmellaro, 1929
  • N. capuanai Fucini, 1929
  • N. ferrettii Wiedenmayer, 1980
  • N. languidus Fucini, 1929
  • N. lascivus Fucini, 1929
  • N. manzonii Gemmellaro, 1886
  • N. perplexus Fucini, 1929
  • N. rapisardii Fucini, 1929
  • N. recuperoi Fucini, 1929
  • N. rupelioi Fucini, 1929
  • N. schopeni Bettoni, 1900
  • N. sublythensis Haas, 1913
  • N. vergai Fucini, 1929
  • N. wrighti Gemmellaro, ????

Description

Ammonites belonging to this genus have evolute, moderately compressed shells. Whorl section is subtrapezoidal to subrectangular. Ventrum is tricarinate, but furrows are not very deep. Ribs are present even on living chamber and have sigmoidal shape. It differs from Lioceratoides by being more evolute and having thicker whorl section. Ribs are also are more regularly arranged.[1]

References
  1. Wiedenmayer, F. (1980). Die Ammoniten Der Mediterranen Provinz Im Pliensbachian Und Unteren Toarcian Aufgrund Neuer Untersuchungen Im Generoso-Becken: Lombardische Alpen (Vol. 93). Birkhauser.
  2. M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
  3. Schlegelmilch, R. (2014). Die Ammoniten des süddeutschen Lias: ein Bestimmungsbuch für Fossiliensammler und Geologen. Springer-Verlag.
  4. Bardin, J., Rouget, I., & Cecca, F. (2016). The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch. Cladistics.
  5. Fauré, P., ALMéRAS, Y., Sekatni, N., & Zargouni, F. (2007). Le Pliensbachien de Jebel Zaghouan (Tunisie). Nouvelles données fauniques. Implications biostratigraphiques et paléobiogéographiques. Geodiversitas, 29(4), 473-506.


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