Anna's Chromodoris

Chromodoris annae

''Chromodoris annae'' is a species of sea slug, a very colourful nudibranch, a shell-less marine gastropod mollusc in the family Chromodorididae.
Anna's Chromodoris (Chromodoris annae) Monument, Lembeh. Night dive. Anna's Chromodoris,Chromodoris annae,Geotagged,Indonesia,Spring

Appearance

''Chromodoris annae'' can reach a maximum size of 5 cm length.
The body is elongate with a foot which is distinct from the upper body by a skirt like mantle hiding partially the foot.
The branched gills and the rhinophores are orange to yellow.
The main background color is bluish, the intensity of the latter varying from blue-grey to intense blue, slightly speckled by tiny black spots.
The blue dorsal side and the foot are bordered with a black line which can be discontinuous depending on the specimen. A black dash between the rhinophores distinguishes this species from similar species like ''Chromodoris elisabethina'' and ''Chromodoris westraliensis''.
The mantle edge and the foot are bordered with white and orange to yellow lines in which the width and the color intensity can vary greatly from a specimen to another.Rudman, W.B., 1998 [In] Sea Slug Forum. Australian Museum, Sydney.
Anna's Chromodoris (Chromodoris annae) with parasite Tanjung Paudean, Lembeh.
It is the same pair of nudis as in the previous pic but in this pic you can see that the nudi below has a parasite in its gills, probably a copepod (Poecilostomatoida). It is the two white appendages seen among the orange gills of the nudi. Anna's Chromodoris,Chromodoris annae,Geotagged,Indonesia,Spring

Distribution

This species of nudibranch is found in the central area of the Indo-Pacific region from Malaysia, Indonesia and the Philippines to the Marshall Islands.
Chromodoris annae Kapal Indah, Lembeh.
Same individual, with its extra rhinophores. Anna's Chromodoris,Chromodoris annae,Geotagged,Indonesia,Spring

Habitat

This nudibranch feeds on the sponge ''Petrosaspongia'' sp..Rudman, W.B., 2004 . [Message in] Sea Slug Forum. Australian Museum, Sydney.

References:

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Taxonomy
KingdomAnimalia
DivisionMollusca
ClassGastropoda
OrderNudibranchia
FamilyChromodorididae
GenusChromodoris
SpeciesC. annae