Phyllidia coelestis is recognisable according to following characteristics
:
- the body is bluish with 2 longitudinal ridges of the same colour, separated
by 3 longitudinal black lines
- there are yellow tubercles on these 2 ridges and on the median black line
- the rhinophores are yellow
- the sole of the foot is uniform grey
Phyllidia coelestis can
be mistaken for Phyllidia
varicosa
and Fryeria
marindica. They can be distinguished by the number of longitudinal black
lines : P. varicosa has 4 ones, P. coelestis has 3 ones and F.
marindica has only 2 lines. Moreover,
P. coelestis is the only one having yellow tubercles on the black line.
Phyllidia coelestis could
also be mistaken for Fryeria
rueppelii and Fryeria
menindie. They can be distinguished by the anus position : it is on
the mantle in P. varicosa, while it is under the mantle in Fryeria.
And unlike P. coelestis, blue tubercles don't form any ridge in 2 Fryeria.
African
Indian Ocean
