Ctenophora Took the Road Less Traveled

Ancient Science

  There are about 150 known species in the phylum Ctenophora, also known as comb jellies. 150 species may not seem like many compared to over 50,000 species of vertebrates alone, but comb jellies have existed for at least 550 million years. Porifera, or sea sponges, and comb jellies are the earliest known animals in […]