Presentation on theme: "By Albert Chen and Anne Ning"— Presentation transcript:
1By Albert Chen and Anne Ning Poriferaa.k.a. “Pore bearers,” or spongesBy Albert Chen and Anne NingCampbell, Neil A., and Jane B. Reece. Biology. 7th ed. San Francisco: Pearson, Benjamin Cummings, 2005.(textbook used on all slides)
3Body Cavity One central cavity called a spongocoel Water enters the spongocoel through porocytesAlbert ChenAnne Ning
4Body Symmetry Nervous System Gas Exchange None None Individual cells respondto the environmentGas ExchangeIndividual cells obtain the oxygen they need from their surroundingsAlbert ChenAnne Ning(left)(right)
5Circulatory SystemWater is circulated by the movement of choanocyte flagellaNutrients from the water are circulated by amoebocytesAlbert ChenAnne Ning
6Digestive System Suspension feeders Choanocytes move water, catch suspended food with their collars, and ingest it through phagocytosis.Food is then transferred to amoebocytes (with pseudopodia) that digest it and transport its nutrients to other cells.Albert ChenAnne Ning
7Excretory SystemPossess large openings called oscula from which water (and waste) leaveAlbert ChenAnne Ning
8Locomotion/Musculature No musclesFlagellated choanocytes create water currents that bring water in to the spongocoelOsculum can be closedSponges do not moveThey are so stationary that the ancient Greeks mistook them for plantsAlbert ChenAnne Ning
9Skeletal Type Amoebocytes produce skeletal fibers within the mesohyl Spicules (sharp) are made from calcium carbonate or silicaFibers produced from spongin are more flexibleAlbert ChenAnne NingInvertebrate biology [ ] Calcinai year: 2006 vol: 125 issue: 3 pg:
10ReproductionSponges are hermaphrodites— produce both sperm and eggs (one gender at a time)Gametes are produced by choanocytes or amoebocytesEggs stay in mesohyl while sperm leave through osculum. (no self-fertilization)Larvae swim (or crawl) somewhere, stick, and develop into sessile adults.They can also reproduce asexually by releasing fragments of adult sponge (gemmules) that can become individual spongesAlbert ChenAnne Ning"The Sponges (Phylum Porifera)." The Earth Life Web. Web. 10 Mar<http://www.earthlife.net/inverts/porifera.html>.
11Additional Information Sponges are involved in symbiosis with algae. In some examples, the “alga represents the main skeleton of the sponge.”Size—wide range from 1cm to 2m.9000 species in this phylum, most live in the ocean.Sponges can produce antibiotics to defend against pathogensFew predators because of toxinsAlbert ChenAnne NingInvertebrate biology [ ] Calcinai year: 2006 vol: 125 issue: 3 page:
12Taxonomy One taxonomic scheme: Phylum Porifera Class Calcarea Order CalciniaOrder CalcaroniaClass HexactinellidaOrder AmphidiscophoraOrder HexasterophoraClass DemospongiaeOrder HomoscleromorphaOrder TetractinomorphaOrder CeractinomorphaAlbert ChenAnne Ning"The Sponges (Phylum Porifera)." The Earth Life Web. Web. 10 Mar<http://www.earthlife.net/inverts/porifera.html>.
13QUIZ – Question 1 Which of the animal phyla has no true tissues? PoriferaCnidariaRotiferaAnnelidaAlbert ChenAnne Ning