Key;
Laboratory;
of;
Cellular;
and;
Molecular;
Evolution,;
Kunming;
Institute;
of;
Zoology,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650223,;
China;
Graduate;
School;
of;
the;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100039,;
China;
Key;
Laboratory;
of;
Cellular;
and;
Molecular;
Evolution,;
Kunming;
Institute;
of;
Zoology,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650223,;
China;
Graduate;
School;
of;
the;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100039,;
China;
Key;
Laboratory;
of;
Cellular;
and;
Molecular;
Evolution,;
Kunming;
Institute;
of;
Zoology,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650223,;
China;
Key;
Laboratory;
of;
Cellular;
and;
Molecular;
Evolution,;
Kunming;
Institute;
of;
Zoology,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650223,;
China;
Graduate;
School;
of;
the;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100039,;
China;
Capital;
University;
of;
Medical;
Sciences,;
Beijing;
100054,;
China;
protozoa,; amitochondriate,; DNA; topoisomerase; II,; phylogenetic; tree,; evolutionary; position.;