vexillifer

larva

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In paracanthopterygian: Life cycle and reproduction
…into a specialized larva, the vexillifer, which lives amid the plankton. After attaining a length of about 7 to 8 cm (about 3 inches), the vexillifer transforms to another larval stage, the tenuis, descends to the bottom, and becomes a parasite in a sea cucumber (Holothuria tubulosa or Stichopus regalis).…
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