This Aeolid nudy has been mis-ID for years Lorraine. Meaning, mis-ID as a
Berghia verrucicornis, when it is really a
Aeolidiella stephanieae. Which means, those articles, books or websites have the wrong species in them.
The true
Berghia verrucicornis has orange-yellow tips on the Cerata ( long sausage looking structures, which serve as gills and often contain the nematocysts, stinging or venomous cells, taken from when they eat Cnidarians, i.e , Corals, Hydroids, anemones etc.).
Berghia verrucicornis
Aeolidiella stephanieae