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| © Photograph by Matthieu Berroneau The Central American coral snake (Micrurus nigrocinctus) commonly eats other smaller serpents, including a newfound species that hasn't yet been found in the wild. |
Scientists have discovered a species of snake unlike any seen before, but this special serpent wasn't found sliding through its forested habitat in tropical Mexico. The newfound animal made its scientific debut in a more unconventional place: inside another snake’s belly.
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| © Illustration by Gabriel Ugueto An artist’s rendering of the new species, Cenaspis aenigma, which translates to “mysterious dinner snake.” |
Newly-described in a recent paper in the Journal of Herpetology, the creature has been appropriately dubbed Cenaspis aenigma, which translates to “mysterious dinner snake.” The name derives from the Latin cena (dinner), aspis (a snake variety), and enigma.
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| © Photograph by Carl J. Franklin A mere glimpse at some of the 200,000 plus amphibians and reptiles housed in Amphibian and Reptile Diversity Research Center at the University of Texas at Arlington. |
This species has unique features that separate it from its relatives,
including the shape of the its skull, the covering of its hemipenis—its
reproductive structure—and the scales under its tail.
Hiding in the wild
Based on certain features of its skeleton and teeth, scientists think Cenaspis
is a burrowing snake that likely feeds on insects and spiders.
Incredibly, however, no live specimens of the creature have been
found—so it’s hard to know precisely what it eats or how it lives, says
Jonathan Campbell, a herpetologist at the University of Texas at
Arlington who led the research team.
The snake, you see, has
evaded detection for 42 years. In 1976, in the southern Mexican state of
Chiapas, palm-harvesters working deep in one of the region’s forests
found a Central American coral snake—a vibrantly-colored species with
neurotoxic venom. When researchers obtained it, they found that its last
meal was another smaller serpent.
This ten inch-long, male snake
was something special, as it didn’t match any known species, so the
specimen was preserved in a museum collection. The research team
returned to the area at least a dozen more times over several decades,
but never found a living representative of the odd snake species.
“This
provides evidence of just how secretive some snakes can be,” says
Campbell. “Combine their elusive habits with restricted ranges and some
snakes do not turn up often.”
Campbell doesn’t think that the snake’s disappearing act is from a post-70s extinction. Rather, he thinks Cenaspis is still out in Chiapas somewhere, but a burrowing lifestyle coupled with other secretive habits may make it difficult to find.
Odd features
The
underside of the creature is adorned with three series of triangular
blotches that make irregular stripes; very few snakes in the New World
have similar striping. It also has fourteen short, stout teeth in its
upper jaw; most members of its family have more or less than that.
But Cenaspsis’s
hemipenes are its most bizarre attribute. Most of its relatives have
hemipenes festooned with spines along the organ’s body, some decorated
with cup-like structures called calyces at the end. The new species’
appendage is spineless, and absolutely covered in calyces, making it
look like some kind of otherworldly honeycomb.
The snake is unique
enough that it qualifies not only as a new species, but a new genus
(which is a group of closely-related species—for example, the genus Canis includes Canis lupus, the gray wolf, but also other animals like coyotes and jackals).
Sara Ruane—a herpetologist and evolutionary biologist at Rutgers University-Newark not involved in this study—is impressed by the finding.
“This
is an excellent contribution to herpetology and reminds us all that you
never know what new information you may get when doing field
collections and taking a closer look at what is already in museums—and
why such collections are important,” says Ruane.
Kevin de Queiroz—zoologist
and curator of the collection of Amphibians and Reptiles at the
Smithsonian’s National Museum of Natural History—agrees.
“It's
always interesting to find a species that is new to science, and even
more so when it appears not to be particularly closely related to any
currently known species.”
But neither Ruane or de Queiroz are surprised that it was a coral snake that had located the ill-fated Cenaspis before human researchers did. These animals are adept specialists at hunting and eating small snakes, and Cenaspis
isn’t the first species to be discovered inside one; it’s happened a
few times before. But as far as Campbell knows, “this is the first time a
new genus has been found in the stomach of a coral snake.”
While
little is known about the biology of the “dinner snake,” the species’
strange, Russian-nesting-doll discovery provides an important lesson
about the world’s biodiversity, much of which remains unseen and
unrecognized.
“[The discovery] tells us that there are likely
still Neotropical snake species remaining to be discovered that are
relatively isolated evolutionarily,” says de Queiroz.
For Campbell, the uniqueness of Cenaspis suggests its habitat is likewise special, and irreplaceable—and worth being considered as a park or protected area.
