Nerve cells may have evolved in animals twice

Ctenophores, also known as the "comb jellies", are an ancient phyla of animals. They have no HOX genes, at least some of which are present in every other animal except themselves and sponges. They lack many of the basic immune system adaptations common to all other animals, including sponges. » 5/27/14 10:16am 5/27/14 10:16am

Meet the carnivorous sponge that traps its prey and grows sperm on…

The recently discovered harp sponge, Chondrocladia lyra, make not look like something you'd bring into the bathtub, but what it lacks in sponginess it more than makes up for in predatory behavior. The harp sponge uses those narrow spines to snare small fish and crustaceans, which it then digests whole. » 11/11/12 12:00pm 11/11/12 12:00pm