Parkinsoniidae BUCKMAN, 1920


Fauna

Lytoceratidae

Pairs

Pseudoperisphinctidae

Parkinsoniidae

Clydoniceratidae

Morphoceratidae

Phlycticeratidae

Sphaeroceratidae

Oppeliidae

Lissoceratidae

Phylloceratidae

Family Parkinsoniidae

A strong costulation, mainly bifurcate and on the venter interrupted ribs, distinguish this family of the middle Jurassic (Bajocian - Bathonian). Some species, have by tubercles reinforced points of junctions. Among others, the tubercles position is next to the end of the ribs, on the ventral area. Parkinoniidae are cosmopolitan ammonites.

Parkinsonia gr. pachypleura (Opp.) Ø 125 mm
P. (Gonolkites) gyrumbilica (Quenst.) Ø 160 mm
P. (Gonolkites) wuerttembergica (Opp.) Ø 88 mm

Genus Parkinsonia

It contains involute and evolute forms with strong and bifurcate ribbing which is interrupted on the venter. Tubercles often develop at points of bifurcation, especially on the younger whorls.