Design in the First Animals
animals, aragonite, Cambrian Explosion, Cambrian News, cilia, Cladonema, Cnidaria, cognitive capacity, comb jellies, crabs, crustaceans, Ctenophora, ctenophores, Current Biology, Darwin's Black Box, Edward Pope, Evolution, fossil record, honeycomb, hydrodynamic coupling, Intelligent Design, jellyfish, lobsters, Michael Behe, mollusks, nacre, Porifera, Precambrian, Robert Hovden, Sarah P. Leys, sea gooseberries, shrimp, Swansea University, tablets, The Edge of Evolution, Tohoku University, University of Michigan, University of Tsukuba
It didn’t take long for animals to master physics and engineering. The first animal body plans were performing feats that fascinate — and baffle — research scientists. Ctenophores: Flashing Paddles Also called sea gooseberries and comb jellies, ctenophores (pronounced TEN-o-fours) are small centimeter-sized marine organisms with rows of cilia, called comb rows or ctenes, which function as paddles for swimming. Though gelatinous and transparent, comb jellies are unrelated to jellyfish (phylum Cnidaria); they have been classified into their own phylum, Ctenophora, characterized by eight of these comb rows. Scientists debate whether ctenophores are the earliest animals that appeared in the Cambrian explosion, as opposed to sponges (phylum Porifera). If so, they arrived with multiple tissues, a nervous system, and a digestive system. That’s a lot to account for without any…