Partectal ring | Glossary - Diatoms of North America

Partectal ring

A partectal ring is the specialized valvocopula of the genus Mastogloia. The partectal ring includes the partecta, the partectal ducts, the partectal pores and the lacuna.

Citations

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.
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.

Mcalcarea Partectalring — Internal SEM view of a valve of Mastogloia calcarea showing the partectal ring. A lacuna forms the gap at each apex of the ring. Partecta line each side of the ring.

Mcalcarea Girdle — External SEM image of a frustule of Mastogloia calcarea in girdle view. A row of partectal pores is present on the partectal ring toward each apex, below the edge of the upper valve. Scale bar = 10 µm.

Mastogloia Lacustris Closed Partectal Ring — Internal SEM view of valve of Mastogloia lacustris showing the partectal ring in the foreground. A lacuna forms the gap at each apex and partecta line each side of the partectal ring.