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Related Flashcards
Cards In This Set
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Panarthropoda
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Clade; Arthropoda, Onychophora and Tardigrada
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Onychophora
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Phylum, felted worms -paired unjointed legs on each segment end in claws-soft outer cuticle is molted-metameric nephridia, open circ. system-respiratory tracheal system
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Ecdysozoans
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All animals that lack external cilia and have an outer cuticle made of chitin that is molted
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Tardigrada
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Phylum; "water bears"-molecular evidence suggests affinity to arthropods-cryptobiosis
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Cryptobiosis
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When desiccated, animal shrivels into a "tun" until water returns
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Tagmosis
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Segments fusing together for specialized functions
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Trochophore Larva
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New segments added in posterior budding zone
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Circulatory system in arthropods
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Open; blood empties from vessels into sinuses to bathe organs and tissues and returns directly from the hemocoel to heart through ostia
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Hemocoel
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Reduced arthropod coelom, persistent blastocoel
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Reprod & excretory organs derived from___(tissue layer)
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Mesoderm
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Arthropod symmetry:
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Bilateral, tagmosis, paired jointed appendages
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Metamorphosis
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A series of distinct post-embryonic changes in body form
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Digestive system
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Complete
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Nervous system
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Ventral double nerve chain of ganglia
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Arthropod epidermal cells
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Secrete the exoskeletal chitinous cuticle
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