The body wall of cheilostome bryozoa IV. The frontal wall of schizoporella unicornis (Johnston).

The frontal wall of Schizoporella unicornis (Johnston) develops as a partition of the coelom just before ascus formation. The ascus develops proximally from the proximal border of the aperture. S. unicornis, therefore, belongs to the monothetic Order Cryptocystidea. The outer part of the opercular cuticle is lost during development.