Microdactylites

Microdactylites, which is sometimes considered to be a synonym of Dactylioceras,[2] is genus of ammonite that lived during early to middle Toarcian stage (Serpentinum to lower Bifrons ammonite Zones) of early Jurassic. Their fossils were found in England, France, Italy, Germany and Hungary. Species belonging to this genus were microconchs of Dactylioceras.[1]

Microdactylites
Temporal range: Toarcian [1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Dactylioceratidae
Subfamily: †Dactylioceratinae
Genus: †Microdactylites
Buckman, 1926
Type species
Ammonites attenuatus
Simpson, 1855
Species
  • M. attenuatus Simpson, 1855
  • M. tardosensis Kovacs, 2014
  • M. arcus Buckman, 1926
  • ?M. gracilis Simpson, 1843
  • ?M. microdactyliformis Maubeuge, 1957

Description

Ammonites belonging to Microdactylites have small shells with evolute, compressed coiling. Flanks are slightly convex to convex and whorl section is suboval to subcircular. Ribbing is dense, while ribs can be both simple or bifurcating.[1]

References
  1. Kovács, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.
  2. M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.


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