cardinalis, Hypoplectrodes Allen [G. R.] & Randall [J. E.] 1990:45 [Revue française d'Aquariologie Herpétologie v. 17 (no. 2); ref. 15982] Off Beacon Island, Wallabi Group, Houtman Abrolhos Islands, Western Australia, depth 3-4 meters. Holotype: WAM P.25314-003. Paratypes: AMS I.18476-001 (1), USNM 214701 (1), WAM P.25226-001 (1), WAM P.25311-007 (2). Type catalog: Moore et al. 2008:19 [ref. 30117], Anderson 2018:15 [ref. 36146]. Replacement name for Ellerkeldia rubra Allen 1976, secondarily preoccupied in Hypoplectrodes by Scopularia rubra de Buen 1959. •Valid as Hypoplectrodes cardinalis Allen & Randall 1990 -- (Gomon et al. 1994:537 [ref. 22532], Kuiter 1997:112 [ref. 25488], Hutchins 2001:262 [ref. 25841], Hutchins 2001:30 [ref. 25847], Allen et al. 2006:986 [ref. 29078], Roberts & Gomon 2008:544 [ref. 30641], Anderson 2018:15 [ref. 36146], Hoschke et al. 2019:155 [ref. 36626], Parenti & Randall 2020:14 [ref. 37354]). •Synonym of Hypoplectrodes australis (Peters 1877) -- (Gill 2023:557 [ref. 40225]). Replacement Name. Current status: Synonym of Hypoplectrodes australis (Peters 1877). Anthiadidae. Habitat: marine.