Word: amphioxus
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...University of California, Berkeley. Primitive multicelled organisms like jellyfish, they reasoned, have three so-called homeotic homeobox genes, or Hox genes, which serve as the master controllers of embryonic development. Flatworms have four, arthropods like fruit flies have eight, and the primitive chordate Branchiostoma (formerly known as Amphioxus) has 10. So around 550 million years ago, Erwin and the others believe, some wormlike creature expanded its Hox cluster, bringing the number of genes up to six. Then, "Boom!" shouts Jablonski. "At that point, perhaps, life crossed some sort of critical threshold." Result: the Cambrian explosion...
...show you, and of course it will be a rather crude diagram by the time it is transferred to your notebooks --shows diagrams of man's descent both from a spider and a worm by the Arachnid and Amphioxus Theories...
...Harvard Zoological Club. "The Orientation of Amphioxus during Locomotion." By Mr. L. B. Arey. -- "Wound-Healing in Anodonta." By D. H. Wenrich. Zoological Laboratory...
...ZOOLOGICAL CLUB. "The Digestive Organs of Amphioxus and Ammocoetes," Professor S. H. Gage, of Cornell University. Short papers. Room 1, fourth floor, Zoological Museum...
...ZOOLOGICAL CLUB. "The Digestive Organs of Amphioxus and Ammocoetes," Professor S. H. Gage, of Cornell University. Short papers. Room 1, fourth floor, Zoological Museum...