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Smithsonian National Museum of Natural History
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Vecchione, Michael, Bruce H. Robison, and Clyde F.E. Roper

1992
A tale of two species: tail morphology in paralarval Chiroteuthis (Cephalopoda: Chiroteuthidae).
Proceeding of the Biological Society of Washington 105(4): 683-692.


ABSTRACT: "Doratopsis" paralarvae of Chiroteuthis were observed in situ and collected intact using a remotely operated vehicle (ROV) in the eastern North Pacific and using a manned submersible in the western North Atlantic. These specimens, the first with complete tails, show remarkable interspecific differences in tail morphology but little intraspecific variability. Eleven Pacific specimens had very long rigid tails characterized by pairs of large, fluid-inflated lateral pouches separated by 4-6 flat, rounded, lateral lobes of tissue (referred to here as flaps, not finlets). The single Atlantic specimen had a long, rigid tail with long, pointed flaps staggered along its sides, each separated by 4-6 short, pointed flaps; when alive, it had what appeared to be very small pouches at the tips of the long flaps. We attribute the Pacific specimens to Chiroteuthis calyx Young. Of the species known from the western North Atlantic and Gulf of Mexico, the Atlantic specimen probably is not C. veranyi Ferrusac, C. lacertosa Verrill, nor C. joubini Voss. It is most likely C. capensis Voss or an undescribed species.

Chiroteuthis sp. A Pacific doratopsis, Chiroteuthis calyx Young. Inks, then swims tail-down.
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Chiroteuthis sp.Also Chiroteuthis calyx Young. Swimming tail-down; note resemblance to siphonophore that floats by in the foreground.
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