How to Identify the Aquatic Coral Snake (Identification Guide)
A semi-aquatic, ringed coral snake of South American rivers and wetlands, identified by its banded pattern and strongly compressed, paddle-like tail.
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Key identifying features
The Aquatic Coral Snake (Micrurus surinamensis) is a distinctive coral snake adapted to a semi-aquatic lifestyle, recognized by its bold rings of red, black, and yellow along with a body shape suited to swimming. Unlike most terrestrial coral snakes, it is frequently found in and around water, and its tail is notably flattened to aid propulsion.
Coloration & pattern
The body displays broad red rings and black bands, typically arranged in triads of black separated by narrow yellow rings, wrapping completely around the body in a repeating sequence. The bands tend to be bold and well-defined, with the red rings often the widest sections. The head is large for a coral snake and mostly red with black markings, a useful feature for this species.
Head, eyes & scales
The head is relatively large and only slightly distinct from the neck, with small eyes positioned to aid vision at the water's surface. Scales are smooth, and the head carries a distinctive red-and-black pattern.
Size & body shape
Adults typically reach 70 centimeters to just over a meter in length. Notably, the tail is flattened and paddle-like compared to other coral snakes, an adaptation that supports efficient swimming, and the body itself may appear somewhat more robust than the slender build of strictly terrestrial coral snake species.
Range & habitat where you'll see it
The Aquatic Coral Snake inhabits slow-moving rivers, streams, flooded forests, and wetlands across the Amazon Basin and other parts of northern South America. It is often found swimming or resting partially submerged, a habitat preference that sets it apart from most other coral snake species, which are primarily terrestrial or fossorial.
How to tell it apart from look-alikes
Its semi-aquatic habits and flattened tail are the most reliable distinguishing features from other South American coral snakes, most of which are terrestrial and lack this paddle-like tail adaptation. The banding pattern alone can resemble other tricolor coral snakes in the region, so observing habitat, the large red-and-black head, and tail shape provides the clearest confirmation.
Frequently asked questions
What makes the Aquatic Coral Snake different from other coral snakes?
It has a flattened, paddle-like tail adapted for swimming and is regularly found in or near water, unlike most terrestrial coral snake species.
What is its typical banding pattern?
Broad red rings alternate with black bands, often in triads separated by narrow yellow rings, wrapping fully around the body.
How large does it grow?
Adults typically measure 70 centimeters to just over a meter.
Where is this snake usually found?
In slow-moving rivers, flooded forests, and wetlands across the Amazon Basin and northern South America, often swimming or partly submerged.
Is the tail shape a useful identification clue?
Yes, its notably flattened, paddle-like tail is a key feature distinguishing it from other coral snakes with rounded tails.