In cyclostomes ....are sexes separate and is development direct or indirect?

Yes the sexes are separate in cyclostomata. The development can be direct or indirect with long larval stage.
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Cyclostomata is a group of chordates that comprises the living jawless fishes: the lampreys and hagfishes. Both groups have round mouths that lack jaws but have retractable horny teeth. The name Cyclostomata means "round mouths".[1][2] Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.
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