Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: †Ammonoidea
Ordo: †Ammonitida
SubOrdo: †Ammonitina
Superfamilia: Eoderocerataceae
Familia: Dactylioceratidae
Genera:
Bettoniceras Wiedenmayer, 1977
Catacoeloceras Buckman, 1923
Cetonoceras Wiedenmayer, 1977
Collina Jhaveri, 1969
Dactylioceras Hyatt, 1867
Nodicoeloceras Buckman, 1926
Peronoceras Hyatt, 1867
Porpoceras Buckman, 1911
Prodactylioceras Spath, 1923
Reynesoceras Spath, 1936
Reynesocoeloceras Geczy, 1976
Septimaniceras Faure, 2002
Zugodactylites Buckman, 1926
References
Stevens, G.R. 2008: Dactylioceratidae (Cephalopoda, Ammonoidea) from the Early Jurassic of New Zealand. New Zealand journal of geology and geophysics, 51: 317–330.
The family Dactylioceratidae comprises Early Jurassic ammonite genera with ribbed and commonly tuberculate shells that resembled later Middle Jurassic stephanoceratids and Upper Jurassic perisphinctids. Shells may be either evolute or involute.
Description
Prodactylioceras cf. davoei
Ammonites with evolute, serpenticone to cadicone shells with ribs, sometimes with tubercules. Members of this family had no keels. while homeomorphic with stephanoceratids and perisphinctids, they had unique shell structure with double shells and flat-topped ribs on the inner shell. Based on suture differences, they are divided into 2 subfamilies. Reynesocoeloceratinae possess two major secondary lobes in dorsal side of external saddle. This saddle is not divided this way in Dactylioceratinae, while lateral lobe is deeply trifid.[1]
Evolution
It has been suggested, that this family is polyphyletic, but this is now considered to be false. Reynesocoeloceratinae evolved in lower Pliensbachian from Metaderoceras and died out in upper Pliensbachian. Reynesoceras oldest member of Dactylioceratinae evolved in upper Pliensbachian from Cetonoceras, or Prodactylioceras. This subfamily died out in middle Toarcian, during Variabilis zone.[1]
Approximate timeline of Dactylioceratidae genera.
Taxonomy
[1][2][3]
Dactylioceratidae Hyatt, 1867
Reynesocoeloceratinae Dommergues, 1986
Reynesocoeloceras Géczy, 1976
Bettoniceras Wiedenmayer, 1977
Prodactylioceras Spath, 1923
Cetonoceras Wiedenmayer, 1977
Dactylioceratinae Hyatt, 1867
Reynesoceras Spath, 1936
Dactylioceras Hyatt, 1867
D. (Dactylioceras) Hyatt, 1867
D. (Orthodactylites) Buckman, 1926
D. (Iranodactylites) Repin, 2000
D. (Eodactylites) Schmidt-Effing, 1972
Nodicoeloceras Buckman, 1926
Peronoceras Hyatt, 1867
Zugodactylites Buckman, 1926
Porpoceras Buckman, 1911
Septimaniceras Fauré, 2002
Catacoeloceras Buckman, 1923
Collina Bonarelli, 1893
Tokurites Repin, 2016
References
Notes
M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
"Paleobiology Database - Dactylioceratidae". Retrieved 2017-10-19.
Yu.S. Repin (2016). "Lower Jurassic ammonite geologic time scale of Northeast Asia". Neftegasovaâ Geologiâ. Teoriâ i Practika. 11 (4): 1–45. doi:10.17353/2070-5379/47_2016.
Bibliography
W. Arkell et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas, Press.
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