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Extinct subfamily of molluscs From Wikipedia, the free encyclopedia
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 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.[1]
| Hildoceratinae Temporal range: | |
|---|---|
| |
| Reconstruction of Hildoceras | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Hildoceratidae |
| Subfamily: | †Hildoceratinae Hyatt, 1867 |
| Genera | |
|
See text | |
| Synonyms | |
|
Mercaticeratinae Guex, 1973 | |
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 Guex, 1974.[3]
Members of this subfamily lived from the upper Pliensbachian to upper Toarcian stages of early Jurassic. Distribution has been worldwide.[1][2]
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