microcephalus, Squalus Bloch [M. E.] & Schneider [J. G.] 1801:135 [M. E. Blochii, Systema Ichthyologiae; ref. 471] Arctic Ocean. No types known. Type catalog: Paepke & Schmidt 1988:161 [ref. 21041]. •Valid as Somniosus microcephalus (Bloch & Schneider 1801) -- (Krefft & Tortonese 1973:46 [ref. 7165], McEachran & Branstetter in Whitehead et al. 1984:143 [ref. 13675], Compagno 1984:103 [ref. 6474], Bass et al. 1986:60 [ref. 5636], Robins & Ray 1986:33 [ref. 23100], Scott & Scott 1988:33 [ref. 25518], Paulin et al. 1989:15 [ref. 24556], McAllister 1990:33 [ref. 14674], Compagno 1990:84 [ref. 21678], Miller 1993:473 [ref. 21297], Yano in Okamura et al. 1995:52 [ref. 22531], Díaz de Astarloa et al. 1999:303 [ref. 24050], Compagno 1999:474 [ref. 25589], Burgess in Collette & Klein-MacPhee 2002:52 [ref. 26158], Moore et al. 2003:169 [ref. 27076], Kiraly et al. 2003:7 [ref. 28226], Nelson et al. 2004:50 [ref. 27807], Yano et al. 2004:369 [ref. 28078], Benz et al. 2007:346 [ref. 29289], Fricke 2007:26 [ref. 30577], George 2009:56 [ref. 30539], Møller et al. 2010:15 [ref. 31169], Castro 2011:124 [ref. 31457]). Current status: Valid as Somniosus microcephalus (Bloch & Schneider 1801). Somniosidae. Distribution: Arctic Ocean; both sides of the North Atlantic (including western Baltic Sea, northern North Sea). Habitat: marine.