Zoospore

[2] One common feature of zoospores is their asymmetrical shape; a result of the ventral grove housing the flagella base.

[2] Others form cysts that vary tremendously in volume (14-4905 cubic micrometers) and shape, each with distinctive hair structures.

1 at right: A zoosporangium is the asexual structure (sporangium) in which the zoospores develop in plants, fungi, or protists (such as the Oomycota).

Developing sporangia of oomycetes go through a process of cleavage in which a protein kinase, in the case of Phytophthora infestans, induces the sporangial cytoplasm to split and release the various zoospores.

[5] Others may utilize species of frogs (such as Bufo marinus and Rana catesbieana) as carriers, allowing extended ranges of travel.

Heterokont zoospore of Saprolegnia with tinsel and whiplash flagella.
Figure 1. Zoospore types. The arrow indicates direction of movement.
Zoosporangia and zoospores of Phytophthora agathidicida