Species that contain: Sicyopus and nigriradiatus [ 1 ] records nigriradiatus, Sicyopus Parenti [L. R.] & Maciolek [J. A.] 1993:958, Figs. 5B, 6 [Bulletin of Marine Science v. 53 (no. 3); ref. 21279] 4th tributary of Nanpil River, Ponape, eastern Caroline Islands. Holotype: CAS 67464. Paratypes: BPBM 35020 [ex CAS 67452] (2); CAS 67359 (1, c&s), 67441 (1), 67445 (2), 67450 (1), 67452 (3, 1 c&s), 67459-67463 (1, 1, 1, 1, 1), 94323 [ex 67452] (1); ROM 64668 [ex CAS 67445] (1); USNM 322469 [ex CAS 67449] (1). •Valid as Sicyopus nigriradiatus Parenti & Maciolek 1993 -- (Watson 1995:267 [ref. 21888], Buden et al. 2001:5 [ref. 25496], Larson & Murdy 2001:3603 [ref. 26293]). •Valid as Smilosicyopus nigriradiatus (Parenti & Maciolek 1993) -- (Keith & Taillebois 2014:72 [ref. 33422], Keith et al. 2015:168 [ref. 34328], Parenti 2021:424 [ref. 38603]). Current status: Valid as Smilosicyopus nigriradiatus (Parenti & Maciolek 1993). Oxudercidae: Sicydiinae. Distribution: Western Pacific: Pohnpei (Federated States of Micronesia) endemic [amphidromous]. Habitat: freshwater, brackish, marine.
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