i think salamander species which after undergo metamorphosis usually has terrestrial adults

Your observation is largely correct, and it aligns well with how the typical life cycle of many salamander species unfolds. Here's a brief overview of that process: 1. **Aquatic Larvae**: Salamanders typically begin their lives as aquatic larvae. Depending on the species, these larvae hatch from eggs laid in water or, for some species like those in the Ambystomatidae family including the Ambystoma genus, eggs are deposited in moist terrestrial environments but remain covered in a jelly-like substance that retains sufficient moisture for development. 2. **Metamorphosis**: Over time, these larvae undergo metamorphosis—a transformative stage where they transition from their gill-breathing, larval state to a lung-breathing adult form. This process involves significant physiological and morphological changes, which may include reducing or absorbing the tail fin, forming legs and lungs, and closing gill slits. 3. **Terrestrial Adult**: Post-metamorphosis, many salamander species emerge as terrestrial adults. These adults possess lungs for respiration and adapt to life on land, although different species might show varying degrees of dependency on moist environments. Adult salamanders generally live among leaf litter, in burrows, under rocks, or in similar moist habitats where their skin can retain moisture. 4. **Ecological Roles**: Terrestrial adults play key roles in their ecosystems, serving as both prey for larger animals and predators for insects and smaller invertebrates. However, it's important to note exceptions (like neotenic species retaining larval features into adulthood), and different salamander families might exhibit variations in this general cycle. Species within the Cryptobranchidae family, for example, are often semi-aquatic or fossorial (living in burrows) even as adults, and do not undergo full metamorphosis like other salamanders. Understanding these intricacies contributes to the overall appreciation for the diversity within the salamander order.