Eastern newt

The eastern newt is a North American salamander whose typical life cycle moves from aquatic larva to terrestrial red eft to aquatic adult.

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Red eft: The bright orange, terrestrial juvenile stage of the eastern newt. This conspicuous stage bridges aquatic larvae and aquatic adults.
Salamander: An amphibian in the order Urodela, typically with an elongated body and tail. The eastern newt is one member of this amphibian group.
Salamander limb regeneration: The regrowth of a functional limb after amputation in salamanders. Eastern newts can regenerate limbs, making their tissues relevant to regeneration research.
Red-spotted newt: A common name for the eastern newt, especially its red eft stage. The name highlights the stage most often encountered on land.
Life-history plasticity: Variation in an organism’s developmental timing or life-cycle strategy in response to conditions. Eastern newts may differ in whether and when they enter the red eft stage.
Newt metamorphosis: The developmental transformation through which a newt changes body form and habitat. It underlies the eastern newt’s shift between aquatic and terrestrial stages.
Amphibian: An ectothermic vertebrate lineage that includes frogs, salamanders, and caecilians. Its permeable skin and life-stage transitions reflect broader amphibian biology.
Amphibian toxicology: The study of toxic substances in amphibians and their effects on organisms. Newt tetrodotoxin offers a natural case for studying chemical defense.
Rough-skinned newt: A toxic North American newt of the Pacific Northwest. It is a distant relative with a similar tetrodotoxin-based defense.
Amphibian decline: The widespread reduction of amphibian populations and species around the world. Habitat loss, disease, and environmental change can threaten newt populations.