BIOL 227 Lecture Notes - Lecture 6: Symmetry In Biology, Synapomorphy, Parallel Evolution
3 May 2016
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Tutorial 6 body morphology & locomotion behaviour. Locomotion using muscles and some form of a skeleton is a general homologous character among. Bilateral symmetry is a general homologous trait (a plesiomorphic character marking a depper internal node) Bilaterally symmetrical animals have a symmetric right and left side (facing the anterior end) and: An asymetric dorsal (top) side and ventral (bottom) side. An asymmetric anterior (head) posterior (trail) axis with the development of an anterior head, an organ that concentrates external receptors, nerves and neurons to process that information. Lancelet segmentation is reflected in the multiple v shaped muscle segments (myomeres) each of which his in a segmented coelomic cavity like the earthworm. Biology) hypothesize that segmented molluscs and arthropods are dervived from an annelid-like ancestor and the most recent version argues that morphological cladistics consider it a homologous character that links arthropods and worms. A grade is a group whose members share key biological features.
