Biology 3229F/G Lecture Notes - Lecture 1: Scleractinia, Symmetry In Biology, Cnidocyte
11 Apr 2018
School
Department
Course
Professor
Document Summary
It is a grouping, an established clade (there is a single common ancestor, synapomorphies) They are also referred to as animalia or metazoans. Many animals have complex life history where at one point in their life they are motile but classes outside animals have this as well. Animals are heterotrophs and cannot generate their own energy. They do not have a rigid cell wall (like plants) All marine phyla have a marine origin. (cid:1688)animals can be divided broadly into vertebrates and invertebrates(cid:1689) > this is not really true. This is a convenient way to group them but classifying them as a clade is more realistic. We need to look on traits based on ancestry not necessarily similarity. 34 phylums of animals, 1. 5-2 million species. (cid:1688)sister clades(cid:1689) are 2 phylums close to one another (i. e arthropoda & onychophora: invertebrates vs vertebrates are not true clades they were classified by convenience vs tree basis.
