BSC 2011L

Kingdom Animalia  All animals are multicelluar and heterotrophic  Some means of locomotion  Always diploid

Animal Taxonomy  Domain Eukarya Kingdom Animalia ○ Invertebrates Parazoa – no true tissue layers Phylum Porifera – sponges Grantia Eumetazoa – true tissues, symmetry -RADIATA – radial symmetry Phylum Ctenophora – comb jellies Phylum Cnidaria Class Hydrozoa – Portuguese man of war, Hydra, Obelia Class Scyphozoa – jelly fish Class Anthozoa – coral and sea anemones

Body Symmetry

Phylum Porifera  Live in water, mostly marine  No true tissues  Adults are sessile but larvae are mobile - planktonic  assymmetrical  Can produce asexually and sexually  Digestion – intracellular choanocytes  Circulation – water transport

Phylum Porifera  Animal: sponges  Symmetry: asymmetrical  Body cavity: spongeocoel  Digestion: intracellular choanocytes  Circulation: water transport, amoebocytes  Segmentation: none  Appendages: none  Nervous: none  Habitat: Aquatic, marine  Respiration: diffusion  Excretion: diffusion  Locomotion: none (sessile, however larvae are flagellated)  Support: spicules

Phylum Ctenophora  Radially symmetrical  True tissues (diploblastic)  Move by cilia  Many are bioluminescent

Phylum Cnidaria  Radially symmetrical  True tissues (diploblastic)  Two body forms: polyp and medusa  Part of zooplankton  Reproduce sexually and asexually  Carnivores  Digestion – gastrovascular cavity  Circulation – cells in direct contact with water

Phylum Cnidaria  Have nerve net between 2 tissue layers  Cnidocytes Stinging cells Each one has fluid filled capsule called nematocyst ○ Contains thread that trap or sting prey

Phylum Cnidaria Class Hydrozoa - Hydra  Animal:Hydra  Symmetry:Radial  Body cavity:coelenteron (sac)  Digestion:gastrovascular cavity  Circulation:cells in direct contact with water  Segmentation:none  Appendages:tentacles around mouth  Nervous:nerve nets  Habitat:Aquatic  Respiration:diffusion  Excretion:none  Locomotion:limited  Support:none

Hydra Model

What are we doing today?  Phylum Porifera Observe preserved specimens Figure 22.2 ○ Be able to identify structures Look at prepared slide of Grantia Look at slide of spicules  Phylum Ctenophora Observe preserved specimens  Phylum Cnidaria Observe specimens Class Hydrozoa ○ Hydra – Observe model -Know following parts: mouth, gastrovascular cavity, tentacle, basal disk, gland cell, mesoglea, cnidocyte Observe microscope slides