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This specimen was found floating dead at the surface and described by Thiele (1920) as a new species, distinct from the two other then-known species of "Moroteuthis" (M. ingens and M. robusta) based on its size, the rostrum of the gladius, and several other bodily proportions.
An Onykia ...
- found in the equatorial Atlantic and Gulf of Mexico.
- with rhomboidal fins (ie fins not drawn-out posteriorly).
- with warts on the skin.
- with rostrum of gladius <15% GL and oval in cross-section.