Nudibranch Similarities

Chromodoris lochi group

Author: Nila Murti

With their strikingly similar colours and patterns, it is quite tricky to distinguish Chromodoris willani, Chromodoris lochi, Chromodoris dianae and Chromodoris boucheti. Chromodoris willani is easier to differentiate from the other three.

Apparently Chromodoris lochi and Chromodoris dianae have different number and shape of gills but this isn't always easy to notice by laymen. The 'easier' external characteristic differences to spot are as follows:

Chromodoris willani has translucent translucent rhinophores and gills, with tiny white dots on them.

Chromodoris boucheti has yellow tipped rhinophores, but with a special pattern in the yellow tipped gills: there is a vertical black line in the middle of each gill running from the base up. The mantle of Chromodoris boucheti is uniformly colored and smooth looking, without any white specks.

Chromodoris lochi has a rather elongated body of the Hypselodoris genus. It has pink or yellow tinted rhinophores and gills which are sometimes translucent (but with no white dots like in Chromodoris willani). The mantle of Chromodoris lochi is uniformly colored and smooth looking, without any white specks. Its dark/black elongate band in the mantle is thin and unbroken.

Chromodoris dianae also has pale blue based gills and rhinophores, with orange yellow or deep yellow tips, but has more of an oval body form of true Chromodoris genus. Its mantle has white specks or dots hence not smooth looking. The black band in Chromodoris dianae are thicker and discontinuous, especially around the rhinophores.

Chromodoris dianae from Mabul, Malaysia
(290 photos)
Chromodoris lochi from Bunaken, IndonesiaIdentification reviewed by Terry Gosliner
(249 photos)
Chromodoris willani from Mabul, Malaysia
(363 photos)

Chromodoris preciosa group

Author: Dr. Richard C. Willan

Chromodoris albonares is quite a small species has only an orange band around the edge of the mantle and (especially large) white rhinophores and white gills.

Chromodoris preciosa is a relatively larger species has three colour bands right next to each other - a thin white band at the edge, then a band of deep red, and inside that a band of yellow. Also, the gills and rhinophores are reddish.


Chromodoris reticulata group

Author: Dr. Richard C. Willan

Chromodoris reticulata has more than 14 gills and no rows of blood-red spots on the outer flanks of the mantle that are possessed by the real Chromodoris tinctoria.


Dendrodoris fumata group

Dendrodoris fumata from Watamu, KenyaIdentification reviewed by Richard Willan
(30 photos)
Dendrodoris nigra from Lembeh, IndonesiaIdentification reviewed by Richard Willan
(81 photos)

Dendronotus frondosus group