Acta Zoologica Volume 72, Issue 4 December 1991, Pages 251-256

G. Fredriksson and R. Olsson

The Subchordal Cells of Oikopleura dioica and O. albicans (Appendicularia, Chordata)

The subchordal cells display considerable variability of ultrastructure, which might be explained by the alternation between highly exocytic and highly endocytic stages. O. dioica has two subchordal cells; O. albicans has “a multitude of quite small subchordal cells” with “essentially the same cytology”.