Final answer:
The species represented by Eastern Red-backed Salamander is Plethodon cinereus.
Step-by-step explanation:
The name of the species represented by Eastern Red-backed Salamander (Plethodon cinereus) is Plethodon cinereus. The Eastern Red-backed Salamander is a specific species within the genus Plethodon. Therefore, option 2) Plethodon cinereus is the correct answer.