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Sea stars are members of the invertebrate group known as echinoderms, which have a unique body plan with five equally symmetric parts. The genetic examination indicated that molecular markers usually associated with the frontal area of the head were found in the middle of each sea star arm. “The kind of sequencing that would have taken months can now be done in a matter of hours, and it’s hundreds of times cheaper than just five years ago,” said David Rank, co–senior author of the study. “These advances meant we could start essentially from scratch in an organism that’s not typically studied in the lab and put together the kind of detailed study that would have been impossible 10 years ago.
“These results suggest that the echinoderms, and sea stars in particular, have the most dramatic example of decoupling of the head and the trunk regions that we are aware of today. It just opens a ton of new questions that we can now start to explore,” said Formerly.
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