A Newly Discovered Iridescent Snake from Vietnam

Back in the day, my grandfather was in Vietnam.. Although he lived in Saigon, he worked closely with the Hmong, the people of the forested mountains which run up the country like a green spine. Sometimes he would rhapsodize about the otherworldly beauty of these tropical cloud forests where he saw sights that seemed to come from times long gone. Beyond the bronze age settlements and floating villages of the Hmong Grandpa said he saw jewel-like orchids and mysterious plants there which were wholly unknown. He also said he witnessed amazing birds, insects, and reptiles and heard rumors of strange animals that seemed to belong in myths (maybe like the saola, which is real (barely)…or maybe like the baku, which is not).

All of which brings us to contemporary news! Back in 2019, a group of American and Vietnamese biologists were studying Vietnam’s northern Ha Giang province (which borders south China) when they found a bizarre snake. The snake did not have bright-light photoreceptors in its eyes and it had strange scales like smooth river pebbles arranged in odd patterns The snake was fossorial–a burrower like the amphibian caecilians. Most strangely of all it had iridescent scales but the colorful opal iridescence was atop dark scales of indigo, lavender, brown, and gray. The snake was unknown to science and it has just been announced as an entirely new species–Achalinus zugorum. It is a member of the genus of snakes called Achalinus, the odd scaled snakes, a poorly understood genus which previously only had 13 known species.

Snakes of the Achalinus genus do not have overlapping scales, instead their scales spread out (perhaps to facilitate a life spent hunting beneath the leaf litter and the forest duff). They seem to be a basal lineage which branched from the evolutionary tree of snakes before the ancestors of other snakes did. Not only their appearance. but also their behavior is very different from that of other snakes. Unfortunately, because of their burrowing lifestyle, the odd-scaled snakes hold tight to their mysteries. A Vietnamese herpetologist who was describing the new species said that during decades of collecting snakes in Vietnam’s snake-filled jungles he has only captured half a dozen Achalinus snakes.

The discovery highlights how much we do not know about creatures and ecosystems which are disappearing quickly. Fortunately, researchers at the Smithsonian sequenced the DNA for Achalinus zugorum before returning the single specimen to Vietnam. We may know nothing about this carnival glass serpent from the underworld, but we also know everything about it (if we ever learn to truly read what we have written down). It excites me to imagine these snakes and other unknown species pursuing their secret and unintelligible lives among the orchid roots, and myceli of unknown fungi in these forests. It makes me anxious though, too. How long will this cryptic & beautiful hidden world even exist before it is all swept away?

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