The yellow sponges in these photos, which grow in the dark under rocks, may all represent Aplysilla sulfurea, although it is possible some may be different. One indication that they may be different is that some of the different forms of the sponge appear to be eaten by different nudibranchs, which are often highly specific in their food sources. The first four photos show the nudibranch Verconia decussata.
This nudibranch on a slightly different looking yellow sponge appears to be Verconia simplex.
The yellow nudibranch Diversidoris crocea feeds on a couple of different forms of what may be the same species of yellow sponge.
Created 20 May 2019