Partectal ring




The valvocopula of the genus Mastogloia. The ring may be closed, forming a complete ring around the cell; or open, with a slit at one apex of the ring, forming the shape of the letter U when separated from the valve.

The partectal ring includes the partecta, the partectal ducts, the partectal pores, and the lacuna.


Paddock, T.B.B. and Kemp, K.D. (1990). An illustrated survey of the morphological features of the diatom genus Mastogloia. Diatom Research 5: 73-103.