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Species of Helicocranchia are small, oceanic squid (100 mm ML) characterized by having a very large funnel and small paddle-like fins that attach to a portion of the gladius that rises above the muscular mantle. They exhibit a gradual ontogenetic descent from near-surface waters as paralarvae to lower mesopelagic depths as near-adults.
- with exceptionally large funnel relative to head and arms.
- with fins which project dorsally in advance of mantle apex.