Phylum Porifera fera means bearing Pore bearing Sponges
Phylum Porifera • • • -fera means bearing Pore bearing Sponges Sessile Mostly marine, some freshwater ~ 10, 000 species worldwide
Tissue Animals • Tissue is the most complex level of organization. They do not have organs or organ systems
Cellular Organelle Molecular Atomic Subatomic
Pronghorn Antelope Organism Organ System Nervous System Organ Tissue Brain Nervous Tissue
Biosphere Ecosystem Community Earth’s surface Bushes Water Hawk Snake Air Pronghorns Grass Hawk Snake Population Herd of Pronghorns Soil
Anatomy of a Sponge
Anatomy and Physiology Draw water in through incurrent pores Expel through large excurrent pore called the osculum Epidermis- outer cell layer Mesenchyme- jellylike matrix Amoebocytes- moving cells, involved in transportation of materials, excretion, and digestion • Spicules- support structures, come in different shapes and different compositions • Collar cells- create current, engulf and partially digest incoming food particles • • •
Anatomy of a Sponge
1. ingestion—the intake of food. 2. digestion– the breaking down of food into substances the animal can use. 3. assimilation– the absorption of the food for later use as a source of energy or building material.
Reproduction Asexual – Budding- group of cells enlarge, separate, and grow into a new sponge – Regeneration- broken piece grows to new sponge Sexual – Primarily in spring – Sperm from one sponge enters collar cell of another. Amoebocyte transfers sperm to an ovum located in the mesenchyme. Zygote develops into flagellated larva.
- Slides: 14