Sonniniidae is a diverse family of Middle Jurassic ammonites ranging from those with stout evolute shells to those whose shells are sharply rimmed, oxyconic. The keel, which runs along the middle of the venter, is typically hollow. Sutures vary from simple to complex. The aptychus is shiny with coarse folds (Cornaptychus).
| Sonniniidae Temporal range:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Superfamily: | †Hildoceratoidea |
| Family: | †Sonniniidae Buckman, 1892 |
| Genera | |
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Sonniniidae are included in the superfamily Hildoceratoidea. Most lived during the middle Bajocian stage. Distribution is worldwide except for boreal.
Taxonomy edit
Sonniniidae is divided into subfamilies with 10 genera.[1]
- Sonniniidae Buckman, 1892
- Sonniniinae Buckman, 1892
- Dorsetensia
- Pseudoshirbuirnia Dietz, 2005
- Shirbuirnia
- Sonninia
- Sonninites Buckman, 1923
- Witchelliinae Callomon and Chandler, 2006
- Asthenoceras
- Fontannesia
- Guhsania
- Newmarracarroceras Hall, 1989
- Witchellia
- Sonniniinae Buckman, 1892
Distribution edit
Argentina, Canada, China, Germany, Hungary, Morocco, Saudi Arabia, Spain, the United Kingdom.[2]
References edit
- W. J. Arkell et al., 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press.
- ^ Sonniniidae entry
- ^ "Paleobiology Database". Retrieved 2014-05-28.
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