
This proposal means that the sunflower sea star (Pycnopodia helianthoides) is considered likely to become in danger of extinction in the foreseeable future. The main threat to the species is a lethal pathogen that caused a recent outbreak of Sea Star Wasting Syndrome. It killed more than 90 percent of sunflower sea stars from 2013 to 2017 in what is considered the largest marine wildlife disease outbreak on record. Sea stars that contract the syndrome become lethargic, develop lesions, lose their arms, and within days disintegrate into gooey masses.