Haeckel, 1862
The lattice of the ellipsoidal, spherical or lenticular shell is totally or partially arranged along a bilaterally symmetrical spiral. Although very abundant, due to their complicated architecture the litheliids are poorly known, for which reason the morphotypes defined may include several different forms.
The following species of this family are treated in the present volume:
Larcopyle butschlii
Larcospira quadrangula
Lithelius minor
Lithelius nautiloides
Pylospira octopyle
Tholospira cervicornis