The fine structure of Pseudopedinella pyriforme Carter (Chrysophyceae)

Abstract

Pseudopedinella pyriforme Carter displays a second non-emergent flagellum and vestigial anterior tentacles. The trailing rhizopodium is without supporting microtubules, and seemingly arises from a posterior vesicle apparently associated with the Golgi apparatus. Stalked pyrenoids, so far unreported for any other member of the Chrysophyceae, are demonstrated. The structure of P. pyriforme is compared with members of the Chrysophyceae and Craspedamonadales and its taxonomic position is discussed.