Dactylioceratidae (Hyatt, 1867) is a family of ammonites represented by the Dactylioceras genre.
Their morphology is defined by the following features (Venturi e al. 2010 and Howarth, 2013): with evolute, serpenticone to cadicone shells, without keel; section of the coils mainly round but also subquadratic or wide subtrapezoidal.
The sutures have arborescent lobes and saddles with accessory lobes, these are longidome shells, i.e. with a body-chamber long more than a whorl and with thickened mouth border similar to that of Lytoceras.
- Ammonite from Whitby - North Yorkshire
- Scientific name
- Dactylioceras Commune
- Kettleness - England
- Geological Period
- Lower Jurassic
- Good condition
- 100×98×55 mm
- 598 g