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How do salamanders differ from reptiles in reproduction?
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Caudata
Tiger salamanders (Ambystoma tigrinum) are widespread across much of the United States. Although they are generally black with yellow blotches, bars, spots, or even stripes, some are lighter in colour or have olive markings. Tiger salamanders belong to the mole salamander family, Ambystomatidae.
Salamanders and reptiles differ significantly in their reproductive strategies, primarily due to their evolutionary history and environmental requirements.
- Egg Structure and Environment: Salamanders, as amphibians, typically lay gelatinous, shell-less eggs that must be deposited in moist or aquatic environments to prevent desiccation. In contrast, reptiles are amniotes, meaning their embryos develop within protective membranes (the amnion, chorion, and allantois) that allow them to lay relatively large, shelled eggs on land.123
- Development: Most salamanders pass through an aquatic larval stage characterized by gills, eventually undergoing metamorphosis to reach the adult form. Reptiles do not undergo this metamorphosis; upon hatching, young reptiles are typically miniatures of the adult.4512
- Fertilization: While many salamanders utilize internal fertilization via a spermatophore (a sperm case picked up by the female), they generally lack the intromittent (copulatory) organs found in most reptiles. Reptiles almost universally possess intromittent organs to facilitate internal fertilization, which is a requirement for their shelled eggs.56
- Live Birth: While most salamanders lay eggs, a few species exhibit viviparity (live birth). Similarly, some reptile species also give birth to live young, a strategy known as ovovivipary.571