Any diver with a certain experience searching for opisthobranchs in the Mediterranean Sea or NE Atlantic could tell you that, sometimes, it is pretty difficult to tell apart which species of pink “flabellina” you are looking at. It’s not really that difficult, as long as you know what to look at in order to differentiate them. Here we include the main traits of the most common species: Flabellina affinis has the following characteristics:…
Any diver with a certain experience searching for opisthobranchs in the Mediterranean or Eastern Atlantic could tell you that, sometimes, it is pretty difficult to tell apart which species of blue Felimare nudibranch you are looking at. The new genus Felimare recently replaced the classic denomination Hypselodoris that is found in most printed books. Felimare opisthobranchs of the Mediterranean and Atlantic Ocean were revised by Ortea et al in 1996. Still…
Tylodina perversa is an opisthobranch species quite common in the Costa Brava (NE Spain), especially on sponges Aplysina (Verongia) aerophoba that are found in very shallow water. Although it has been always considered carnivorous -it is always found feeding on the same type of sponges-, a more detailed study put this fact in jeopardy. Every indication shows that the opisthobranch consistently prefers the sponges with a greater ammount of cyanophyte…
