A bulbous chamber on the inside of the
Found only in the genus Mastogloia. Usually arranged in a row on each side of the valvocopula, together forming the
partectal ring. Plural form is partecta.
The partecta secrete mucilage to the outside of the diatom cell through relatively large pores, the partectal pores, in the wall of the valvocopula. These pores are connected to the partecta by the partectal ducts.
A synonym for partectum.
An alternate term for partectum, used in some of the older literature (Stoermer et al., 1964).
Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms. Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.
Stoermer, E.F., Pankratz, H.S. and Drum, R.W. (1964). The fine structure of Mastogloia grevillei Wm. Smith. Protoplasma 59: 1-13.
Image Credit: Pat Kociolek
Light micrographs of Mastogloia smitii. On the right, a high level of focus showing the valve face. On the left, a deeper level of focus revealing the valvocopula, with a row of partecta on each side.
Image Credit: Loren Bahls
Light micrographs of the valvocopula of M. pumila. On the left, the entire valvocopula. On the right, several partecta, with one partectum marked by an arrow.