hystricosum, Acanthidium Garman [S.] 1906:206 [Bulletin of the Museum of Comparative Zoology v. 46 (no. 11); ref. 1542] Sagami Bay, Japan. Holotype (unique): MCZ 1130-S [ex Owston #7784] (missing). Type catalog: Hartel & Dingerkus 1997:xl [ref. 23119]. Apparently the spelling should be Deania hystricosa. •Valid as Deania hystricosum (Garman 1906) -- (Compagno 1999:473 [ref. 25589], Bañon et al. 2010:3 [ref. 31029]). •Valid as Deania histricosa (Garman 1906) -- (Compagno 1984:66 [ref. 6474], Paulin et al. 1989:14 [ref. 24556], Springer 1990:14 [ref. 19315]). •Questionable synonym of Deania calcea (Lowe 1839) -- (Rodríguez-Cabello et al. 2020:15 [ref. 38141]). •Valid as Deania hystricosa (Garman 1906) -- (Uiblein et al. 1999:60 [ref. 24045], Nakabo 2000:152 [ref. 25086], Nakabo 2002:152 [ref. 26001], Sanjuán et al. 2012:901 [ref. 32132], Duffy et al. 2015:137 [ref. 34222], Bañón et al. 2016:298 [ref. 34397], Compagno 2016:1175 [ref. 34544], Weigmann 2016:55 [ref. 34211], Biscoito et al. 2018:472 [ref. 37562], Almeida & Biscoito 2019:96 [ref. 37302], Carneiro et al. 2019:37 [ref. 37250], Miyazaki et al. 2019:122 [ref. 37957], Ebert et al. 2021:26 [ref. 38234], Bañón & Mano 2022:5 [ref. 40121]). •Synonym of Deania calceus (Lowe 1839) -- (Marrero et al. 2023:9 [ref. 41514]). Current status: Synonym of Deania calceus (Lowe 1839). Centrophoridae. Distribution: Eastern Atlantic: Galicia (Spain), Azores, Madeira, Canary Islands, off Namibia; northwestern Pacific: Japan [if valid]. Habitat: marine.