Lecture_11_21_Arthropoda_1

Lecture_11_21_Arthropoda_1 - Krill Spider Trilobite...

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Krill
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Spider
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Trilobite (extinct)
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Daphnia (water flea)
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Centipede
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Harlequin bugs
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Tick You
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Tadpole shrimp
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Saturnid moth
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Decapod crab
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Millipede
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Coconut crab with its prey
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Ants (eating a grasshopper)
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Arthropoda and their allies:
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A hard exoskeleton is one of the features that defines arthropods. Does that imply that every species of arthropod must have a hard exoskeleton? A) Yes. Once a feature evolves it won’t change. B) No. Features can be modified, including defining ones. C) Yes for living arthropods. However, extinct/fossil ones often will not have the defining feature.
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in Arthropods Velvet worm Water bear Exoskeleton, jointed appendages
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Crustacea (crabs, shrimp, copepods) Hexapods (insects and relatives) Chelicerata (horseshoe crab, spiders, Scorpions, pyncogonids) Myriapoda (centipedes, millipedes) ? Trlobita (extinct) A phylogeny of Arthropoda
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Segmented, undifferentiated Fusion of segments into functional units = Tagma Games arthropods play: tagmatization
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Exoskeleton: hard, chitin (complex polysaccharide, waterproof, tough) Attachment for muscles--> excellent locomotion Exoskeleton Muscles
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This document was uploaded on 01/24/2009.

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Lecture_11_21_Arthropoda_1 - Krill Spider Trilobite...

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