Systematics and Evolution, Part A The Mycota

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Fig. 3.16 (a–s) Stramenopile zoospore fine structure.
All zoospores presented in same orientation using
same rootlet notation, modified from that used by
Barr and De ́saulniers ( 1989 ): AK, anterior kinetosome
(flagellar root); PK, posterior kientosome; AR, anterior
rootlet; PR, posterior rootlet, together with number of
microtubules usually recorded in each. In some species
a striate fan (SF) interconnects the anterior and poste-
rior flagella. The presence (+) or absence (–) of the


coiled thread known as the transitional helix (TH+/–)
(Beakes 1987 ) located immediately above the basal
plate, which separates the flagellum from the zoospore
body, is also indicated. Finally, the presence (+) or
absence (–) of kinetosome associated K-bodies (Leh-
nen and Powell 1989 ) (K+/–) is also noted. Other zoo-
spore organelles labelled include the nucleus (N) and
water expulsion apparatus (WEV). (a–c) Diagrams
showing ultrastructural characteristics ofLabrinthulo-

Systematics of the Straminipila: Labyrinthulomycota, Hyphochytriomycota, and Oomycota 77
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