exactly the same clade of Symbiodinium (KJ499999)(Fig. 1).
The novelty ofthis work comes from the factthatthose two
species had never been described as interacting together,
and that all life stages of P. lugubris occur on P. rus. This
argues in favor of the existence of a horizontal transfer of
symbionts, from coral to adult nudibranchs, which in turn
will transfer its symbionts to their eggs.