Pennella crassicornis Steenstrup & Lutken, 1861

Not valid. Original report from Bottlenose whales ( Hyperodon ampullatus and Ziphias cavirostris) and pelagic fishes ( Xiphias gladius, Mola mola and Naucrates ductor) in the Atlantic and Mediterranean. Original figures and description not detailed enough to separate the species from P. filosa or P. balaenoptera, both of which it closely resembles; synonym of P. filosa on fishes, of P. balaenoptera on mammals (Hogans 1987); accepted as P. filosa (Walter & Boxshall 2015) .