English: A shell of female pelagic cephalopod Argonauta hians which serves as an eggcase. A drawing by Niccolò Gualtieri (1742).
Русский: Раковина самки пелагического головоногого моллюска Argonauta hians, выступающая в роли выводковой камеры. Рисунок Никколо Гуалтиери (1742)
Date 1742
Source Index Testarum Conchyliorum (1742) of Niccolò Gualtieri.
Author Niccolò Gualtieri
Source: https://commons.wikimedia.org/wiki/File:Argonauta-hians-001.jpg

Argonauta hians, also known as the winged argonaut, muddy argonaut or brown paper nautilus, is a species of pelagic octopus. The common name comes from the grey to brown coloured shell. 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). The eggcase is characterised by a wide keel that gives it a square appearance, few rounded tubercles along the keel, and less than 40 smooth ribs across the sides of the shell. (Wiwipedia)

Order: Octopoda
Family: Argonautidae
Genus: Argonauta
Species: Argonauta hians Lightfoot, 1786
Synonyms
- Argonauta gondola Dillwyn, 1817
- Argonauta haustrum Dillwyn, 1817
- Ocythoe cranchii Leach, 1817
- Argonauta nitida Lamarck, 1822 in 1815-1822
- Argonauta crassicosta Blainville, 1826
- Argonauta raricosta Leach in Blainville, 1826
- Octopus (Philonexis) minimus d'Orbigny, 1834 in 1834-1847
- Argonauta owenii A. Adams & Reeve, 1848 in 1848-1850
- Argonauta kochiana Dunker, 1852
- Argonauta cornuta Conrad, 1854
- Argonauta dispar Conrad, 1854
- Argonauta polita Conrad, 1854
- Argonauta hians f. aurita Von Martens, 1867
- Argonauta hians f. mutica Von Martens, 1867
- Argonauta hians f. obtusangula Von Martens, 1867
- Argonauta expansa Dall, 1872