Hildoceratinae is an extinct subfamily of cephalopods belonging to the family

Hildoceratidae Hildoceratidae is a family of ammonoid cephalopods from the Lower Jurassic, lower Pliensbachian (''Jamesoni'' zone) to lower Bajocian (maybe even upper Bajocian) substages, generally with strongly ribbed, involute shells. They are combined with ...

. Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter. Ribs were variable, from falcate to strongly angled and from fine to strong. They can be interrupted by spiral groove in midlateral part of the shell. While some species can be smooth, strongly ribbed ones can have tubercules. Microconchs have short lapplets that is in its shape similar to the shape of growth lines in spiral midlateral groove.

Genera

Bardin, J., Rouget, I., & Cecca, F. (2016). The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch. Cladistics. * ''

Hildaites Hildoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae. Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter. Ribs were variable, from fa ...

'' Buckman, 1921 * ''

Orthildaites ''Orthildaites'' is a genus of ammonites that lived during the lower Toarcian stage of early Jurassic, during Falciferum subzone. Description Shell of these ammonites had quadrate whorl section with broad venter and strong keel in the cent ...

'' Buckman, 1923 * '' Cingolites'' Sassaroli et Venturi, 2010 * ''

Hildoceras ''Hildoceras'' is a genus of ammonite from the Jurassic period in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral groove r ...

'' Hyatt, 1867 * '' Urkutites'' Géczy, 1967 * ''

Parahildaites ''Parahildaites'' is genus of ammonites that lived during the lower Toarcian stage of early Jurassic, during Bifrons zone. It differs from ''Hildaites'' and ''Hildoceras ''Hildoceras'' is a genus of ammonite from the Jurassic period in ...

'' Blaison, 1967 * ''

Mercaticeras ''Mercaticeras'' is an extinct genus of ammonites belonging to the family Hildoceratidae. Etymology The genus name ''Mercaticeras'' derives from Michele Mercati (a Tuscan physician who lived in the 16th century, superintendent of the Vatican B ...

'' Buckman, 1913 * '' Hildaitoides'' Hillebrandt, 1987 * '' Atacamiceras'' Hillebrandt, 1987 * ''

Neolioceratoides Neolioceratoides is genus of ammonites that lived during the Pliensbachian and Toarcian stages of early Jurassic. It has been considered to be a synonym of '' Lioceratoides'',M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Re ...

'' Cantaluppi, 1970

Alternative classification

Genera ''Praemercaticeras'' Venturi, 1981, ''Mercaticeras'' Buckman, 1913, ''Pseudomercaticeras'' Merla, 1932, ''Merlaites'' Gabilly, 1974, and ''Crassiceras'' Merla, 1932 have also been classified as belonging to a separate subfamily

Mercaticeratinae Hildoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae. Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter. Ribs were variable, from fa ...

Guex, 1974.

Distribution

Members of this subfamily lived from the upper Pliensbachian to upper Toarcian stages of early Jurassic. Distribution has been worldwide.

References

Hildoceratidae Early Jurassic ammonites Ammonites of Asia Ammonites of Africa Ammonites of Europe Ammonites of South America Ammonites of North America Prehistoric animal subfamilies Toarcian life {{ammonite-stub