phylum porifera sponges
DESCRIPTION
Phylum Porifera SPONGES. Sponges are classified as animals because they are multicellular, heterotrophic, have no cell walls, and contain a few specialized cells. Environment Aquatic Ecosystem Provide habitats for other marine animals - PowerPoint PPT PresentationTRANSCRIPT
Phylum Porifera
SPONGESSponges are classified as animals because they are multicellular, heterotrophic, have no cell walls, and contain a few specialized cells.
Environment• Aquatic Ecosystem• Provide habitats for other marine animals• Commensalism /mutualism – form
partnerships with photosynthetic bacteria, algae, and protists that provide food and oxygen
Food Source• Filter Feeders• Digestion is intracellular
Maintaining Homeostasis - Internal(Circulation, Respiration, Excretion)
• Water moving through a sponge carries out body functions – carries nutrients and dissolved oxygen, removes wastes.
Maintaining Homeostasis - External(Response)
• No nervous system• Many make toxins to protect themselves
Movement• Larva – carried by currents before they
settle on ocean floor• Adult Sponges are sessile (do not move)
Reproduction• Sexually or Asexually• Internal Fertilization
Evolutionary Milestone• Multicellularity
• Vocabulary:– Internal Fertilization p666– Larva p666
• Page 665 Figure 26-8 or picture below: