The cyst-theca relationship of <i>Protoperidinium americanum</i> (Gran &amp; Braarud) Balech

Lewis, Jane; Dodge, J. D.

doi:https://doi.org/10.1144/jm.6.2.113

Articles | Volume 6, issue 2

https://doi.org/10.1144/jm.6.2.113

© Author(s) 1987. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.1144/jm.6.2.113

© Author(s) 1987. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 6, issue 2

01 Nov 1987

| 01 Nov 1987

The cyst-theca relationship of Protoperidinium americanum (Gran & Braarud) Balech

Jane Lewis and J. D. Dodge

Abstract. The cyst-theca relationship of Protoperidinium americanum (Gran & Braarud) Balech was investigated using single cyst germination techniques. This Protoperidinium has an unusual theca with four intercalary plates (plate formula 4’, 4a, 7″, 4c, 7s, 5″’, 2″″). It has a distinctive brown capsulate cyst which has an apical archeopyle. The position of this species in the genus Protoperidinium is discussed. The distribution of the cyst on the west coast of Scotland is described.