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The Mastigoteuthis agassizii species-group occurs throughout much of the Atlantic, Indian and Pacific Oceans. At present we are confident of the separate species status of only two species: M. agassizii and M. psychrophila. However, character variation through the wide range of the group is apparent (see Comments) and we suspect that eventually more species will prove to be valid.
At present we refer to the tropical to temperate Indo-Pacific member as M. dentata, to the south temperate, tropical to boreal Atlantic member as M. agassizii (see the M. agassizii page for more details), and to the high-latitude southern form found in at least the South Atlantic and South Pacific as M. psychrophila.
Mastigoteuthids with ...
- numerous, small but easily seen integumental photophores.
- broadly spaced chromatophores.