knerii, Pentaceros Steindachner [F.] 1866:19 [Anzeiger der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftlichen Classe v. 3; ref. 21713] Cape Horn, South America. Holotype (unique): NMW 38617. Species first described in the abstract above, later described and illustrated in more detail in Steindachner 1866 [ref. 14059], p. 208 [p. 1 of separate], Pl. 1 (figs. 1-2); also appeared in English in Steindachner 1866:311 [ref. 21712]. •Valid as Pentaceros knerii Steindachner 1866 -- (Pequeño 1989:62 [ref. 14125]). •Synonym of Pseudopentaceros richardsoni (Smith 1844) -- (Hardy 1983:206 [ref. 5385], Gomon et al. 1994:636 [ref. 22532]). •Synonym of Pentaceros richardsoni Smith 1844. Current status: Synonym of Pentaceros richardsoni Smith 1844. Pentacerotidae: Pentacerotinae. Habitat: marine.