English: Eggcase of Argonauta nodosa
中文（繁體）‎: 瘤船蛸 Argonauta nouryi 的卵盒
Date 3 September 2006 (original upload date)
Author Mgiganteus1 https://en.wikipedia.org/wiki/User:Mgiganteus1 at English Wikipedia
Source: https://commons.wikimedia.org/wiki/File:Argonauta_nodosa_eggcase.png

Argonauta nodosa, also known as the knobby or knobbed argonaut, is a species of pelagic octopus. The female of the species, like all argonauts, creates a paper-thin eggcase that coils around the octopus much like the way a nautilus lives in its shell (hence the name paper nautilus).
Order: Octopoda
Family: Argonautidae
Genus: Argonauta
Species: Argonauta nodosa Lightfoot, 1786
Synonyms:
Argonauta oryzata Meuschen, 1787
Argonauta tuberculata Röding, 1798
Argonauta tuberculosa Lamarck, 1822 in 1815-1822
Argonauta gracilis Kirk, 1885