Species of Planctoteuthis are usually rather small and very fragile deep-sea squids that are often badly damaged during capture. As a result, few species have been described. Unlike other chiroteuthids, the subadult retains the peculiar doratopsid paralarval tentacular club. Roper and Young (1967) suggest that Planktoteuthis is a neotenic doratopsis.
A chiroteuthid ...
- with antitragus but no tragus in oval funnel locking-apparatus.
- with a compact club not divided into proximal and distal regions by structure of protective membranes.
- without funnel valve.
- without photophores.
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