Phylliroe bucephala

Phylliroe bucephala is a parasitic species of pelagic nudibranch, a marine gastropod mollusc in the family Phylliroidae.

Phylliroe bucephala
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Nudibranchia
Suborder:	Cladobranchia
Family:	Phylliroidae
Genus:	Phylliroe
Species:	P. bucephala
Binomial name
Phylliroe bucephala Lamarck, 1816
Synonyms
List Phylliroe bucephale Peron and Lesueur, 1810 Phylliroe bucephalum Péron & Lesueur, 1810 Phylliroe roseum d'Orbigny, 1836 Phylliroe sanzoi Sparta, 1925

Biology

This species of nudibranch is transparent with its guts visible through the laterally flattened body. It has a tail and two long smooth rhinophores. It feeds on jellyfish and plankton as an adult. The juveniles parasitize Zanclea medusae.^[1]

The eyes of the nautilus look more like pinholes more than anything, they lack a solid lens but they're capable of forming a dim image. The retina of Nautilus pompilius have the visual pigment rhodopsin, along with a peak absorption of 465 nm, and a small amount of retinochrome that helps regenerate rhodopsin for dim vision.^[2]