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
Genus: Catacoeloceras
Catacoeloceras is a genus of ammonite that lived during Middle Toarcian stage of early Jurassic. Members of this genus existed from the Bifrons Subzone of the Bifrons Zone to the Variabilis Zone. Their fossils have been found in Europe, northern Africa, Asia, North America and South America.[1] It is believed to have evolved from Porpoceras.[2]
Type species
Catacoeloceras confectum
Buckman, 1923
Species
C. confectum Buckman, 1923
C. dumortieri de Brun, 1932
C. raquinianum d'Orbigny, 1844
C. crassum Young & Bird, 1828
C. engeli Monestier, 1931
C. jordani Guex, 1972
C. becaudi Rulleau & Lacroix, 2013
C. densicostatum (Schmidt-Effing, 1972)
C. puteolum (Simpson, 1855)
?C. manifestum (Dagis, 1967)
?C. proprium (Dagis, 1967)
?C. prinzi (Géczy, 1967)
?C. grangei Stevens, 2008
Synonyms
Omolonoceras Dagis, 1967
Description
Life restoration
Ammonites belonging to this genus have cadicone shells with depressed, rounded whorl section. Some species have almost spheroconic shells and these ones were designated as genus Transicoeloceras. Transicoeloceras is now considered a synonym of Catacoeloceras by some authors, although others still regard it as a valid genus. The ribs on these shells can be either simple or bifurcating. Most species display ventrolateral tubercules and the venter between these tubercles on the body chamber is often smooth and flat. A constriction is present near the mouth border. The genus also exhibits size dimorphism. Genus Mucrodactylites is considered to be a microconch.[1][2]
References
M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
Kovács, Z. (2014). Toarcian Dactylioceratidae (Ammonitina) from the Gerecse Mts (Hungary). Hantkeniana, 9, 45-77.
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