Species that contain: Rhynchobdella and aculeata [ 2 ] records

orientalis, Rhynchobdella Bloch [M. E.] & Schneider [J. G.] 1801:478 [M. E. Blochii, Systema Ichthyologiae; ref. 471] Kali Brantas basin, channelled stream through drained area at Campurdarat south to Tulungagung, 8°10'S, 111°20'E, Java Timur, Java, Indonesia. Neotype: ZRC 49866. Type catalog: Paepke 1999:98 [ref. 24282]. Unneeded replacement name for Ophidium aculeatum Bloch 1786 according to Paepke 1999; Pethiyagoda et al. 2008:43 [ref. 30097] suggest it is not a replacement name. It is a new name to include the type specimen of aculeatus (W.N.E.) but not technically a replacement name. After type selection of the same specimen for aculeata and orientalis, then orientalis is a junior objective synonym of aculeatus. •Synonym of Macrognathus aculeatus (Bloch 1786) -- (Pethiyagoda et al. 2008:43 [ref. 30097], Kottelat 2013:311 [ref. 32989]). Current status: Synonym of Macrognathus aculeatus (Bloch 1786). Mastacembelidae. Habitat: freshwater.

siamensis, Rhynchobdella aculeata var. Günther [A.] 1861:540 [Catalogue of the fishes in the British Museum v. 3; ref. 1964] Pachebore [Petchaburi], Thailand. Holotype (unique): BMNH 1861.10.8.14. •Valid as Macrognathus siamensis (Günther 1861) -- (Travers 1984:144 [ref. 5147], Roberts 1986:103 [ref. 5802], Rainboth 1996:179 [ref. 22772], Kottelat 1998:117 [ref. 23436], Freyhof et al. 2000:97 [ref. 25184], Arunkumar & Tombi Singh 2000:121 [ref. 25674], Kottelat 2001:149 [ref. 25780], Kottelat & Widjanarti 2005:168 [ref. 28284], Britz 2010:307 [ref. 30685], Britz 2010:55 [ref. 30857], Page & Burr 2011:466 [ref. 31215], Page et al. 2013:115 [ref. 32708], Kottelat 2013:312 [ref. 32989], Kottelat 2015:49 [ref. 33971], Robins et al. 2018:246 [ref. 35886], Taki et al. 2021:348 [ref. 39830], Page et al. 2023:126 [ref. 40505]). Current status: Valid as Macrognathus siamensis (Günther 1861). Mastacembelidae. Distribution: Southeast Asia: Chao Phraya and Mekong River basins, Laos, Thailand, Cambodia and Vietnam; established in Florida, U.S.A. Habitat: freshwater.