Animal Symmetry - Mrs. Volkmann's Website...Spherical and radial symmetry are typically associated...
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11/6/2017 1 Characteristics of all Animalia: • multicellular, heterotrophic, eukaryotic • ingestive nutrition with digestion in internal cavity • NO cell walls • All have nerves and muscles, except Porifera • most reproduce sexually with differentiated sperm and egg; some asexual • embryo proceeds through gastrulation • all aerobic • active locomotion common, by cilia or muscles • enormous diversity of body form though most are worm-like Most scientists agree animals were descendents of colonial flagellated protists called choanoflagellates, a group of nearly identical, very unspecialized organisms 1. Asymmetry Animal Symmetry 2. Bilateral Animal Symmetry 3. Radial Animal Symmetry 1. Hydrostatic Animal Skeletons
Transcript of Animal Symmetry - Mrs. Volkmann's Website...Spherical and radial symmetry are typically associated...
11/6/2017
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Characteristics of all Animalia:
• multicellular, heterotrophic, eukaryotic• ingestive nutrition with digestion in internal cavity• NO cell walls• All have nerves and muscles, except Porifera• most reproduce sexually with differentiated sperm
and egg; some asexual• embryo proceeds through gastrulation• all aerobic• active locomotion common, by cilia or muscles• enormous diversity of body form though most are worm-like
Most scientists agree animals were descendents of colonial flagellated protists called choanoflagellates, a group of nearly identical, very unspecialized organisms
1. AsymmetryAnimal
Symmetry 2. BilateralAnimal
Symmetry
3. RadialAnimal Symmetry
1. HydrostaticAnimal Skeletons
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2. ExoskeletonAnimal Skeletons 3. Endoskeleton
Animal Skeletons
ALL Animals Develop From
Embryos
EmbryologicalDevelopment
All animals
have endoderm
and ectoderm. Some
develop mesoderm
as well.
EmbryologicalDevelopment
Some animals have a COELEM(a body cavity surrounded on all sides by mesoderm)
Body Plan
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Animals can be Acoelomate, Coelomate, OR Pseudocoelomate
Body Plan
lateral view of a fish
Since most bilaterally symmetrical animals move through their environments with their anterior end forward, feeding and sensory structures are usually concentrated here (cephalization) – a huge advantage!
Spherical and radial symmetry are typically associated with sessile or drifting animals
Body Plan
The terminology is DIFERENT in Upright Animals like humans (compared to animals on 4 legs, or others like fish that swim head first)
