Researchers have been debating the Tully monster's evolution since the creature was discovered in the 1950s.
Tully monsters haunted Earth's oceans 300 million years ago and left behind such bizarre fossils that researchers haven't even agreed on whether these strange creatures had backbones. Now, more than 60 years after the strange creature's discovery in 1958, a new investigation using 3D lasers finds that the Tully monster was likely an invertebrate, but not everyone is convinced.
Most recent Tully monster studies argue that it's either a vertebrate relative of modern cyclostomes in the chordate group or an unknown invertebrate. Now, researchers in Japan think they've cracked the case, with the help of a 3D laser scanner. Most convincing of all, the team claims, is segmentation found on the creature's head."This characteristic is not known in any vertebrate lineage, suggesting a nonvertebrate affinity," Mikami said.
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