Amphibians
Narrow-Striped Dwarf Siren
Pseudobranchus striatus · also called narrow-striped dwarf sirens
Hidden among dense aquatic vegetation in a shallow southeastern wetland, a narrow-striped dwarf siren moves with an eel-like motion, its tiny front legs and permanent feathery gills marking it as one of the smallest and most fully aquatic salamanders in all of North America.
Overview
The narrow-striped dwarf siren, Pseudobranchus striatus, is a lungless, eel-like amphibian native to shallow, densely vegetated wetland habitat across the southeastern coastal plain of the United States. Its genuinely tiny size, permanent external gills, and ability to survive seasonal drought by burrowing into mud make it one of the more physically extreme and specialised salamanders in North America.
A salamander that never leaves the water
Unlike most salamanders, which spend at least part of their life on land, the narrow-striped dwarf siren remains fully aquatic for its entire existence, keeping the feathery gills and eel-like body plan most other salamanders abandon after their larval stage.
Status
Least Concern — widespread and stable across suitable shallow wetland habitat throughout the southeastern coastal plain of the United States.
Narrow-Striped Dwarf Siren: common questions
Why does the narrow-striped dwarf siren keep its gills for life?
This species remains fully aquatic throughout its entire life and never undergoes the metamorphosis into a terrestrial adult that many other salamanders go through, so it has no need to lose its external, feathery gills, retaining them permanently as its primary means of breathing underwater.
How does the narrow-striped dwarf siren survive when its wetland dries up?
This species can burrow down into the mud of its shallow wetland habitat and enter a dormant state when seasonal drought causes the water to disappear, remaining protected within the moist mud until rainfall returns and refills the habitat, a survival strategy shared with several other aquatic salamander species facing similar seasonal conditions.
How is the narrow-striped dwarf siren different from the Everglades dwarf siren?
These two closely related species can be distinguished primarily by their stripe pattern, with the narrow-striped dwarf siren showing thinner pale stripes running the length of its body, and the two species also occupy somewhat different, though sometimes overlapping, parts of the southeastern coastal plain.
How small is the narrow-striped dwarf siren?
This species is among the smallest salamander species found anywhere in North America, with a notably slender, eel-like body considerably shorter than most other aquatic salamanders, a genuinely diminutive size even within its own already small-bodied family.