1-3 Polypus horsti Joubin = Octopus cyanea Gray, 1849, regeneration of arms (r = regenerating arm)
4 Octopod embryo, bristle initial
5 Octopod embryo, ovoid structure next to bristle initial
6 Octopod embryo, growing bristle initial, lateral view
7 Octopod embryo, bristle initial at club-shaped stage, lateral view
8 Octopod embryo, incipient bristle beginning to split, lateral view
9 Octopod embryo, incipient bristle beginning to split, transverse section
10 Octopod embryo, bristle
11 Octopod embryo, bristle
12 Polypus horsti Joubin = Octopus cyanea Gray, 1849, pattern of ventral arm surface
English: Anatomical details of octopuses from Zanzibar
Date 1907
Source Proceedings of the Zoological Society of London (vol. 1907 issue 3, plate XX)
Author M.P.Parker
Source: https://commons.wikimedia.org/wiki/File:PZSL1907Plate20.png

The big blue octopus or day octopus (Octopus cyanea) is an octopus in the family Octopodidae. Octopus cyanea is found on reefs and in shallow waters in the Indo-Pacific. Its range extends from the Red Sea, the East African coast, and Madagascar, to southeastern Asia, Oceania, and as far as Hawaii.