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9 Cards in this Set
- Front
- Back
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Adaptations for life on land
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-skeletal strengthening (primarily bone, 4 limbs)
-shifting of special sense priorities from lateral line system to smell and hearing -most still reliant on water for reproduction |
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Physical characteristics
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-ectothermic w/low metabolic rate
-circulation via 3-chambered heart -separate sexes (internal or external fert.) -eggs yolky with jellylike membrane -smooth skin, moist with many glands -respiration via lungs, skin, and/or gills |
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Order: Gymnophiona
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Elongate, limbless burrowing (caecilians)
-many vertebrae -small eyes, many blind -internal fert, oviparous |
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Order: Caudata
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-Tailed amphibians (salamanders)
-Some aquatic, some terrestrial adults -limbs at 90* to body -carnivorous -respiration via gills, lungs, both, or neither (vascular nets in skin) -internal fert. |
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Order: Anura
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-tailless (frogs and toads)
-complete metamorphosis -no gilled adults -external fert. -many reproductive strategies (floating foam masses, tend eggs, carry on back, direct development) |
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Anuran: Ranidae
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-most familiar, abundant
-near water -solitary -defense: inflating lungs -hibernate -can be frozen |
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Anuran: Hylidae
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tree frogs
clinging pads on feet |
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Anuran: Bufonidae
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True toads
-dull color, stocky build, skin glands -toxins, mucus, camouflage -bidder's organ in males--rudimentary ovary |
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Tadpole development
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-operculum fuses with body wall on right side, small opening remains on left (spiracle)
-hindlegs appear first -tail is absorbed during metamorphosis -mouth changes, lungs develop, gills are absorbed |
