Nudibranchia
Among the
very large group of marine, so-called 'naked' slugs few species have developed
the ability of a holo-planktonic life, whereas the majority of the species has
a benthic way of life, using their foot for locomotion on more or less firm
substrates. As none of these nudibranchs has a shell, and their larval shells
are almost completely unknown, it is impossible to find them as fossils. To
give an idea about the beauty of these animals I reproduce here the front cover
of Lalli & Gilmer's
(1989) book, showing two mating individuals of Glaucus
atlanticus Forster, 1777. Further info on these creatures can be found
concentrated in this book (pp. 214-236).
