Marine Cytoplasmic strands extend through shells pores function in swimming and feeding 4. Apicomplexa Parasites of animals infectious cells called sporozoites Plasmodium causes malaria 5. Trypanosoma causes African sleeping sickness 6. 50 copies of genome, controls everyday functions, necessary for asexual reproduction. Highly differentiated body cells which are organized into tissues, organs, and organ systems for such specialized functions as digestion, internal transport, gas exchange, movement, coordination, excretion, and reproduction.
Reproduction is typically sexual with flagellated sperm fertilizing nonmotile eggs to form zygotes.
A diploid stage dominates the life cycle. Zygote undergoes a series of mitotic divisions known as cleavage which produces a blastula in most animals. Clues to Animal Phylogeny A. Major Branches of Animal Kingdom 1. Subkingdom Parazoa Only phylum Porifera Unique development and simple anatomy separates this phylum from others. Subkingdom Eumetazoa Branch Radiata Have radial symmetry These animals have a top and bottom but no front, back, left, or right sides.