But starting in 2008, a series of studies rocked the base of the animal tree, suggesting that ctenophores (comb jellies) were the ancestral model instead. Yesterday (November 30), an international ...

Central to this debate is the question of which group represents the first branch of the animal family tree: sponges, the simple filter-feeders, or ctenophores, also known as comb jellies ...

Comb jellies, or ctenophores, are a group of gelatinous marine invertebrates known for their distinctive rows of cilia, which resemble combs and help them swim. Often mistaken for jellyfish due to ...