Lecture 14 – Animal Survey – Systematics

Lecture 14 – Animal Survey – Systematics

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Lecture 14 – Animal Survey – Systematics A. Classification Criteria - The monophyletic group of animals is Opisthokonts (no motile cells or motile cells with one flagella) - Animals: multicellular (there is some division of labor), eukaryotic, ingestive heterotrophs - It is thought that from the protozoa, the animal kingdom evolved at least twice, into sponges and into all other animals. The sponges are a different branch all together and are not considered to be ancestral to the rest of the animal kingdom How do you form a branching diagram? There is a series of questions you must ask: 1) Does it have tissues or not? Hierarchy from most primitive to most advanced: single celled colonial multicellular tissues, organs, systems, organisms 2) What kind of symmetry? 1. Tissues – groups of cells that are similar in structure (muscle cells look like muscle cells, nerve cells look like nerve cells), function, and embryonic origin a. Parazoa – Porifera - If there are no tissues, it is placed in a subkingdom called Parazoa - Porifera is the only phylum in Parazoa, and Porifera consists of sponges. Sponges are just multicellular, with no tissue level of organization
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This note was uploaded on 05/30/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Lecture 14 – Animal Survey – Systematics

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