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4 Cards in this Set
- Front
- Back
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How have fishes overcome the constraints of living in water? What factors allow swimming to be so efficient?
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Water = highly dense compared to air + incompressible. Gravity = lowered in H2O --> easy to swim.
Sound, electro-reception = travels faster in water. Swim bladder maintains buoyancy in water. Locomotion in water = very little energy expenditure |
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What is their CNS surrounded by? Describe their fins, scales, gills.
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CNS is enclosed by bone like our brain to our skull. Fins are pelvic, paired, and pectoral. Scales are mesodermally derived. Pharyngeal slits = gills for respiration.
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What are the two subphylums for fishes?
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Agnatha - jawless fishes.
Class myxini - hagfishes - cartilaginous skeleton. No paired appendages, no stomach. Mucousy slime. Class Cephalaspidomorphi - Lampreys - oral disk + predators Gnathostomes - bony fishes or cartilaginous fishes. Chondrichthyes |
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Describe the Condrichthyes in greater detail. Swim bladder? Skeleton? Ways of reproduction? What is the Ampullae of Lorenzini?
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Chondrichthyes - sharks, swim bladder = hydrostatic organ --> buoyancy; osmoregulate by circulating waste around body.
Oviparous - lay eggs like a chicken. Ovoviviparous - eggs develop inside mom then is given birth. Viviparous - Embryo develops without a |
