Intro to Invertebrates . Chapter 25 Sections 1 & 2. Invertebrates (inverts) include all animals that lack a backbone, or vertebral column. This includes 33 Phyla. Phylum Porifera. The term Porifera means “pore-bearers” in Latin. This phylum includes Sponges.
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Sections 1 & 2
Invertebrates (inverts) include all animals that lack a backbone, or vertebral column.
Bilateral symmetry- a single imaginary plane divides the body into left and right sides that are mirror images of each other.
Germ Layers-during embryonic development the cells of most animals differentiate into 3 layers, called germ layers
Mesoderm- middle layer that gives rise to muscles and much of the circulatory, reproductive, and excretory systems.
Body Cavities- a fluid-filled space between the digestive tract and the body wall
Segmentation- repeated parts on an animal. Most have repeated body parts on the inside also.
Cephalization-The concentration of sense organs and nerve cells at the organisms anterior end. (to have a head)