Unformatted text preview: the evolutionary tree. Hominins include Homo sapiens and our ancestors, a group of extinct species that are more closely related to us than to chimpanzees. Lancelet Member of the subphylum Cephalochordata, small blade-shaped marine chordates that lack a backbone. lateral line system A mechanoreceptor system consisting of a series of pores and receptor units along the sides of the body in fishes and aquatic amphibians;...
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- Spring '10
- Membranes, yolk sac, Subphylum Cephalochordata, blade-shaped marine chordates