Giant isopods are like something out of a science fiction novel—these massive, armored crustaceans use 14 legs to crawl along the ocean floor at staggering depths. It might seem unlikely that one of these species could be missed while in plain sight, but that’s exactly what’s happened, until now. Scientists have discovered a new giant isopod species among the sea creatures held in a Japanese aquarium.

This cream-colored crustacean was originally mistaken for its larger relative, called Bathynomus giganteus. Then, while researching isopod genetics, Huang Ming-Chih from Taiwan’s National University of Tainan sequenced its DNA. The genetic sequence showed at least 35 differences between B. giganteus and this isopod, which meant this individual appeared to be something new.  Dairy Cow Isopods For Sale

The authors constructed an evolutionary tree, mapping the relationships between this and other isopods. They found that the closest relative of the new-to-science B. yucatanensis is the larger B. giganteus—the isopod that it was originally mistaken for. “The two species likely had a common ancestor,” the researchers write.

Compared to B. giganteus, this new species “has more slender body proportions and is shorter in total length,” the authors write. Plus, it has longer antennae and a thorax that’s shaped like an inverted triangle, rather than an oval.

The researchers suggest there may be other Bathynomus species still undiscovered in the Gulf of Mexico. As of now, though, this finding brings the total to three—B. maxeyorum, which was described in 2016, B. giganteus and B. yucatanensis.

Being able to identify these species could be important to conservation: The researchers conclude that some giant isopods are targets of deep-sea trawl fisheries, so “it is important to know precisely which species are being caught.”

Besides, the new discovery gives scientists a clearer picture of what’s out there on the ocean floor. “The ecological diversity of the Gulf of Mexico may be more complex than [previously] thought,” Huang tells Live Science’s Patrick Pester in an email.

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