Order Carnivora Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 532 628 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Halichoerus Nilsson 1820 Halichoerus Nilsson 1820 , Skand. Faun. Dagg. Djur., Vol. 1: 376 . Type Species: Halichoerus griseus Nilsson 1820 Synonyms: Halychoerus Boitard 1842 . Species and subspecies: 1 species with 2 subspecies: Species Halichoerus grypus (Fabricius 1791) Subspecies Halichoerus grypus subsp. grypus Fabricius 1791 Subspecies Halichoerus grypus subsp. macrorhynchus Hornschuch and Schilling 1851 Discussion: Mohr (1952) described successful mating in captivity between Pusa hispida and Halichoerus grypus .