Animal Diversity

What is an Animal?

• Animal Characteristics– Eukaryotic– Multicellular– Heterotrophic– Lack cell walls

• Unique combination

Other Interesting Features

• Internal digestion (digestive tract)

• Life cycle– Diploid adults produce haploid gametes– Some develop directly to adult form– some go through a larval (immature) stage

• Metamorphosis = change in body from larva to adult

Evolution of Animal Life

Phylum Porifera

• Add sponge diagram & pics

Radial Symmetry

Phylum Cnidaria

Cnidocytes

Bilateral Symmetry

Phylum Platyhelmenthes

Body Cavities - Acoelomate

Body Cavities - Pseudocoelomate

Body Cavities - Coelomate

Phylum Nematoda

Phylum Moluska

Mollusk Key Features

Segmentation

Phylum Annelida

Phylum Arthropoda

Arthropod Body Plan

Phylum Echinodermata

Phylum Chordata

Vertebrates

First VertebratesAgnathans (jawless fishes)

Lampreys & hagfish

Evolution of Jaws

Fish

• Most successful & diverse group of vertebrates– ~30,800 living species– Amphibians evolved from them

• Key characteristics– Gills– Vertebral column– Single loop circulatory system– Nutritional deficiencies

Fish

Evolution of Amphibians

Amphibians

Anura Urodella

Evolution of Amniotes

Extant Reptiles

Evolution of Birds from Reptiles

Extant Birds

Mammalia