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[1106 Exam 3 - Lab 36] porifera, cnidaria notes

[1106 Exam 3 - Lab 36] porifera, cnidaria notes - Phyla...

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Phyla Porifera and Cnidaria notes Kingdom Animalia : Animals are  eukaryotic, multicellular, ingestive-feeding heterotrophs.   Each  phylum of the animal kingdom represents a unique body plan.  Some phyla are also subdivided into  classes.   Phylum Porifera  (sponges) - asymmetrical bodies (no symmetry or pattern) - lack distinct tissues and organs - loose assemblage of cells, lacks true tissues - unique cells –  choanocytes  (collar cells), flagellated cells that draw water in and filter food  particles - filter-feeding  heterotrophs - have no photosynthetic pigments - Morphology: o Epithelial layer forms outer wall. o The walls are   lined with  choanocytes, amoebocytes, spicules, and mesenchyme. Amoebocytes  are mobile cells that can be used for: Digestion Ability to differentiate other cell types Secrete  calcareous  spicules,  siliceous  spiculues, or  proteinaceous  spongin fibers Spicules  are crystalline skeletal structures that help reinforce the wall.  Choanocytes  are surrounded by a collar of microvilli   (traps food particles)  and have a flagellum (draws in water through pores   to the spongocoel); they  are flagellated cells that draw in water and filter food particles. Pores formed by  porocytes Spongocoel  is the inside of the sponge (central cavity)  Food from  microvilli  moves toward base of cell into a food vacuole Food vacuole  pass to  amoeboid cells  ( intracellular  digestion  occurs)  Filtered water exits through large hole in the end of the sponge called osculum   Mesenchyme  is a gelatinous matrix - Sponge Reproduction:   Asexually and sexually o Most species of sponges are monoecious or  hermaphroditic  (have both male and  female sex organs) but produce eggs and sperm at different times. o Asexually: Reproduce asexually by budding and by the release of  gemmules  (stress- resistant aggregates of amoebocytes) In favorable conditions,  amoebocytes in gemmules  can grow into a mature  organism.
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