title: Evolution: they never come back, or do they?
abstract: There is a notion in evolution that traits, once lost, cannot re-evolve. A new species of bone-eating worm defies this notion. Its males are free-living and look nothing like the dwarfed bags of sperm of its relatives.
authors.affiliation: Florian Maderspacher is Current Biology's Senior Reviews Editor. Electronic address: florian.maderspacher@current-biology.com.
authors.forename: Florian
authors.initials: F
authors.lastname: Maderspacher
mesh_terms: D000818:Animals; D049628:Body Size; D005260:Female; D008297:Male; D010802:Phylogeny; D011077:Polychaeta / Q000145:classification* / Q000502:physiology*