Micrurus surinamensis Aquatic Coral Snake
Some other names for this species:
Surinam Coral Snake
Subspecies I've seen:
M. s. surinamensis
Aquatic Coral Snake
Micrurus surinamensis surinamensis Aquatic Coral Snake
Madre Selva Biological Station, Loreto, PeruJanuary 16, 2013
Aquatic Coral Snake (Micrurus surinamensis surinamensis) Aquatic Coral Snake (Micrurus surinamensis surinamensis)
This species was one of the two most commonly-seen snakes by our group throughout our Peruvian adventure, the other being Imantodes cenchoa. On most nights, at least one of these snakes (and usually more) was found in one of the shallow streams that cross the various trails at both the Madre Selva and Santa Cruz field stations. The first photo here shows the snake as found; the second photo shows it all flattened and tightened up after it was disturbed.

Here is a complete list of the herps I saw in the wild on my 2013 MT Amazon Expeditions trip.

Madre Selva Biological Station, Loreto, PeruJanuary 18, 2013
Aquatic Coral Snake (Micrurus surinamensis surinamensis) Aquatic Coral Snake (Micrurus surinamensis surinamensis)
Gina Harper, queen of coral snake spotting, saw this one in the middle of the trail after Sean Harper and I had both walked right past it. Note the dramatic difference between the initial, unworried appearance and the flattened, post-disturbance appearance.
Santa Cruz Forest Reserve, Loreto, PeruJanuary 18, 2014
Aquatic Coral Snake (Micrurus surinamensis surinamensis)
Matt Cage spotted this snake in a stream we were crossing at night. I wanted an in situ photo, so I snuck up to the snake's position. It noticed us (or, probably, just me) and puffed up. I got just this one photo before it submerged and disappeared into the muck. Matt poked around with his tongs and we did get one more glimpse of the snake before it disappeared again, this time for good.

Here is a complete list of the herps I saw in the wild on my 2014 MT Amazon Expeditions trip.

Madre Selva Biological Station, Loreto, PeruFebruary 1, 2016
Aquatic Coral Snake (Micrurus surinamensis surinamensis)
We saw this snake from a bridge over a creek. It was perched on a partially submerged log, entirely out of the water, but drinking from the creek.

My Travelogues and Trip Lists page includes a complete list of the herps I saw in the wild on my 2016 MT Amazon Expeditions trip.

Printed references: