Representatives of the genus Trochammina are widespread in the Middle Jurassic of Arctic, Boreal, and Subboreal paleobasins. This group is important for stratigraphic and biofacial investigations. Foraminifers of the genus Trochammina, including T. praesquamata Mjatliuk and T. jakovlevae sp. nov. are described in detail.
- Arctic and Boreal regions
- Middle Jurassic