Reynesoceras

Reynesoceras is genus of ammonites that lived during the upper Pliensbachian stage of early Jurassic. It has evolved from Prodactylioceras, or Cetonoceras. Dactylioceras (Eodactylites) has probably evolved from this genus. Aveyroniceras is a name for macroconchs of this genus. Their fossils were found in Europe, northern Africa, Asia, North America and South America.[1][3]

Reynesoceras
Temporal range: Pliensbachian [1][2]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Dactylioceratidae
Subfamily: †Dactylioceratinae
Genus: †Reynesoceras
Spath, 1936
Type species
Ammonites ragazzonii
Hauer, 1861
Species
  • R. ragazzonii Hauer, 1861
  • R. angulosum Wiedenmayer, 1980
  • R. morosum Bettoni, 1900
  • R. subanguinum Meneghini, 1875
  • R. acanthoides Reynès, 1868
  • R. ausonicum Fucini, 1900
  • R. dumortieri Del Campana, 1900
  • R. medolense Hauer, 1861
  • R. striatum Del Campana, 1900
Synonyms
  • Aveyroniceras Pinna & Levi-Setti, 1971

Description

Ammonites of this genus had shells with depressed whorl section and single, coarse ribs. Ribs are crossing venter, but there is no bifurcation, which is often present on other genera belonging to Dactylioceratidae. Also, there are no tubercules, which is a thing that differs them from Tokurites.[1][4]

Distribution

British Columbia, Chile, Hungary, Italy and Morocco [5]

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References
  1. M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
  2. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2017-10-16.
  3. Kovács, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.
  4. Repin Yu.S. Ammonitovaya shkala nizhney yury Severo-Vostoka Azii [Lower Jurassic ammonite geologic time scale of Northeast Asia]. Neftegazovaya Geologiya. Teoriya I Praktika, 2016, vol. 11, no. 4, available at: http://www.ngtp.ru/rub/2/47_2016.pdf
  5. Paleobiology Database - Reynesoceras. 2017-10-16.


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