Thecodont dentition
- Thecodont dentition refers to the presence of teeth that are set in individual sockets in the jawbone, which is a characteristic feature of reptiles and not mammals.
- Mammals typically possess heterodont dentition, which means they have different types of teeth (incisors, canines, premolars, and molars) that are not set in sockets.

Alveolar lungs
- Alveolar lungs are a characteristic feature of mammals.
- Mammals have lungs with numerous alveoli, which are small air sacs responsible for the exchange of gases.

Ten pairs of cranial nerves
- Mammals typically have 12 pairs of cranial nerves.
- These cranial nerves emerge from the brain and innervate various structures in the head and neck region.
- Each cranial nerve has a specific function, such as controlling facial muscles, transmitting sensory information, or regulating autonomic functions.

Seven cervical vertebrae
- Mammals, including humans, generally have seven cervical vertebrae in their neck region.
- This allows for a wide range of head movements and flexibility.

Ten pairs of cranial nerves
- The statement that mammals have ten pairs of cranial nerves is incorrect.
- Mammals actually have 12 pairs of cranial nerves.
- These cranial nerves emerge from the brain and innervate various structures in the head and neck region.
- Each cranial nerve has a specific function, such as controlling facial muscles, transmitting sensory information, or regulating autonomic functions.

Conclusion:
- The characteristic that is not typical of the class Mammalia is the presence of ten pairs of cranial nerves.
- Mammals typically have 12 pairs of cranial nerves, not ten.
- The other options, including thecodont dentition, alveolar lungs, and seven cervical vertebrae, are all typical features of mammals.