Dactylioceratidae
| Dactylioceratidae Temporal range: early -middle Jurassic | |
|---|---|
| Scientific classification | |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Superfamily: | Eoderocerataceae |
| Family: | Dactylioceratidae Hyatt, 1867 |
The family Dactylioceratidae comprises Early to Middle Jurassic ammonite genera with ribbed and commonly tuberculate shells that resembled later Middle Jurassic stephanoceratids and Upper Jurassicperisphinctids. Shells may be either evolute or involute.
The Dactylioceratidae may be polyphyletic and therefore invalid as a proper taxon. Some may have their origin in the Lytoceratina, others in the Eoderoceratidae.
References
- W. Arkell, et al, 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas, Press.
- Dactylioceratidae in fossilworks, 4/25/14