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12 Cards in this Set
- Front
- Back
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What are the synapomorphies of Ornithodira?
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Advanced Mesotarsal ankle
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What are the synapomorphies of Dinosauria?
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1. 3 or more sacral vertebrae
2. greatly reduced fibula 3. 3 or fewer phalanges on 4th digit of hand |
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What are the synapomorphies of Pterosauria?
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Presence of wing, supported by 4th finger
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What are the synapomorphies of Tetanurae?
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Furcula
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What were characteristics of Pterosaurs?
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Extra phalanx in digit 4, thin-walled hollow bones, large sternum, bipedality, largest was Quetzalcoatlus.
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What is the function of the carina in bats?
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keeps muscle from collapsing on itself during contraction so air channels are kept open
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What do ova develop from?
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primordial germ cells that have migrated into germinal epithelium.
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What is the theca?
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layer of medulla cells that is formed around the follicle cells
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what is the antrum?
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In Theria, a fluid-filled space between the ovum and follicle cell layer
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where are sperm cells produced?
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Spermatic ampullae(fish + amphibians) or seminiferous tubules (amniotes)
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In what organisms are the testes unpaired? Paired?
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Unpaired in agnathans, paired in gnathostomes
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What is the path of sperm in gnathostomes?
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rete testes to efferent ductules eo epididymis to sperm duct
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