xanthonotus, Rivulus Ahl [E.] 1926:315 [3] [Blätter für Aquarien- und Terrarienkunde v. 37 (no. 13); ref. 19991] Amazonas. Lectotype: ZMB 21168. Paralectotypes: ZMB 31425 [ex ZMB 21168] (1). Type catalog: Paepke & Seegers 1986:169 [ref. 19981]. On p. 3 of separate. Lectotype selected by Seegers in Paepke & Seegers 1986:169 [ref. 19981]. Types mentioned: Paepke 1995:94 [ref. 21847]. •Possible synonym of Rivulus micropus (Steindachner 1863) -- (Huber 1991:67 [ref. 19721]). •Status uncertain -- (Huber 1992:458 [ref. 20639]). •Valid as Rivulus xanthonotus Ahl 1926 -- (Lazara 2001:286 [ref. 25711], Costa in Reis et al. 2003:540 [ref. 27061], Costa 2006:139 [ref. 28875] in subgenus Cynodonichthys, Vermeulen 2022:15 [ref. 39817]). •Valid as Anablepsoides xanthonotus (Ahl 1926) -- (Costa 2011:243 [ref. 31655]). Current status: Valid as Anablepsoides xanthonotus (Ahl 1926). Rivulidae: Rivulinae. Distribution: Amazon River basin, Brazil. Habitat: freshwater.