Brief Summary

Read full entry

Introduction

This pelagic species occupies near-surface waters (at least at night) in the temperate regions of the world's oceans. The females are large with a mantle length up to 310 mm (Roper and Sweeny, 1976). The mantle is very muscular and the octopod, presumably, is an excellent swimmer. The ventral and dorsal arms are much longer than the lateral arms. Females of Ocythoe are one of the few known cephalopods with a true swimbladder (Packard and Wurtz, 1994) and the only known cephalopods that are ovoviviparous (i.e., give birth to live young that hatch internally) (Naef, 1923). A pair of water pores at the base of the ventral arms lead to extensive water-filled spaces between the eyes and arm bases. In subadult and adult females the ventral surface of the mantle has permanent ridges formimg a reticulate pattern. Males are dwarfs with a mantle length of about 30 mm.

Figure. Lateral view of a young female O. tuberculata, 71 mm ML, in a shipboard aquarium showing ridges and tubercules on the ventral half of the mantle. Photograph by U. Piatkowski, taken aboard the R/V G.O. SARS during the MAR-ECO expedition, 2004, at 50°N, 28°W.

Brief diagnosis:

An argonautoid ...

  • with relatively arms II and III much shorter than arms I and IV.
  • with reticulate ridge pattern on ventral surface of mantle in females.

Trusted

Belongs to 0 communities

This taxon hasn't been featured in any communities yet.

Learn more about Communities

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!