Karaites branched off from normative Judaism about 1300 years ago, after the Talmud was completed, that’s why they are never mentioned in the Gemara. It seems that Tzedokim disappeared shortly after the destruction of the Beis HaMikdash almost 2000 years ago (except for a few holdouts (see Shabbos 88a). Kussim (Samaritans) were around and are still around after 2600 years.
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