Chapter 9 Diversity of life Flashcards
Cnidaria
Animals: Hydra, jellyfish, sea anemone, coral.
Symmetry: Radial
Tissue: Diploblasts, true tissues
Circulatory: Diffusion / none
Nervous: Nerve net, no brain
Respiratory: Diffusion / none
Digestive: Gastrovascular cavity, two-way digestion
Excretory: Diffusion / none
Life situation: Aquatic, life cycles switch from polyp to medusa, sexual or asexual reproduction, hydrostatic skeleton aid in movement.
Platyhelminthes
Animals: Flatworms,trematoda flukes, tapeworms, planaria.
Symmetry: Bilateral with cephalization
Tissue: Triploblasts, true tissues
- Acoelomate
Circulatory: Diffusion / none
Nervous: two nerve cords, anterior centralized brain (ganglia)
Respiratory: Diffusion / none
Digestive: Gastrovascular cavity, two-way digestion
Excretory: Protonephridia and flame cells
Life situation: hermaphrodities or regeneration, parasitic lifestyle, tapeworms: do not have true tissues.
Nematode:
Animals: Round worm, hook worm, trichinella C, elegans, ascarcis.
Symmetry: Bilateral
Tissue: Triploblasts, true tissues
Circulatory: Diffusion / none
Nervous: Nerve cord and ring
Respiratory: Diffusion / none
Digestive: Alimentary canal , one way digestion
Excretory: Diffusion / none
Life situation: Have cuticle ~ prevents degradation by host digestive system.
Longitudinal muscle ~ shorter, no circular muscles,
NOT SEGMENTED.
