Some members of the diverse genus Beroe may occasionally attain a length of up to 30 centimetres (12 in), … See more

Nudans feed on free swimming animals with soft bodies, primarily on other ctenophores, many of them larger than they are themselves. They actively hunt for prey, which they usually devour whole. Some species us… See more

In the late 1980s the ctenophore species Mnemiopsis leidyi was introduced into the Black Sea, probably through ballast water, which led to the collapse of the local anchovy population. In 1997 another ctenophor… See more

All species are hermaphrodites and reproduce sexually, having both female and male gonads. Although no detailed figures are available, it is assumed that self-fertilization is the exception among nudans. The fertilize… See more

There are no known fossil nudans, so the phylogenetic evolution of the group by comparison with other modern ctenophores is not possible. In the traditional system, the Nuda form a class distinct from the Tentaculata, … See more