polygonius, Plectranthias Shepherd [B.], Phelps [T. A. Y.], Pinheiro [H. T.], Rocha [C. R.] & Rocha [L. A.] 2020:148, Figs. 1, 2A [ZooKeys No. 941; ref. 37583] Tahiti, French Polynesia, 17°29'27"S, 149°28'01"W, depth 105 meters. Holotype: CAS 247193. Paratype: USNM 445722 (1). •Valid as Plectranthias polygonius Shepherd, Phelps, Pinheiro, Rocha & Rocha 2020 -- (Anderson 2022:572 [ref. 39757]). •Valid as Xenanthias polygonius (Shepherd, Phelps, Pinheiro, Rocha & Rocha 2020) -- (Tang & Chen 2025:19 [ref. 42528]). Current status: Valid as Xenanthias polygonius (Shepherd, Phelps, Pinheiro, Rocha & Rocha 2020). Anthiadidae. Distribution: Central and southern Pacific: Marshall Islands; French Polynesia. Habitat: marine.