The ultrastructure and systematics of Schizocaryum dogieli, a ciliate endocommensal in Pacific echinoids

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Abstract
Schizocaryum dogieli Poljansky &Golikova, 1957 was isolated from several species of Pacific strongylocentrotid echinoids in the area of Friday Harbor, WA. The somatic kineties are composed of polykinetids of up to 15 kinetosomes of which only the right posterior one bears a postciliary ribbon at triplet 9, an anteriorly directed kinetodesmal fibril at triplets 6 and 7, and a transverse ribbon at triplets 4 and 5. The other kinetosomes are irregularly associated with this kinetosome by dense basal connectives. The oral ciliature consists of a series of primary transverse rows separated by cortical ridges and associated with numbers of irregularly arrayed, ciliated kinetosomes. The rightmost kinetosome of each primary transverse row apparently bears a postciliary ribbon. Schizocaryum dogieli is removed from the family Plagiopylidae and placed in a new, monotypic family, the Schizocaryidae Jankowski n.fam. This family has an uncertain position within the phylum Ciliophora.

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