Many Osedax species have numerous pinnules on their palps that give the crown a feathery appearance. Of the known Osedax species, only O. mucofloris and O. frankpressi have pinnules oriented all inward (the pinnules in the other species being turned outward, both inward and outward, or absent). Most known Osedax species have red palps (the palps of O. frankpressi are red with two white lateral stripes in living worms), but the palps of Osedax mucofloris are white to pink. (Rouse et al. 2004; Vrijenhoek et al. 2009)
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