Photographed by: Graham Abbott
and Stiliger ornatus
are small sap-suckers that have almost identical in external appearance and coloration, particularly the golden cerata with a subterminal black ring. They differences are very subtle. Costasiella sp.
has its eyes touching on top of its head whereas Stiliger ornatus
has them separated and a black stripe in between. Costasiella sp.
has pointed rhinophores whereas Stiliger ornatus
has blunt ones.
Costasiella species all have their eyes situated close together on top of their head (not shown in this image) and they are intimately associated with green algae of the genus Avrainvillea, on which they feed.
Pictures of Costasiella sp.
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