Updated 22 Sept. 2023
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Cynodon Spix & Agassiz 1829 cyno-, from kynós (Gr. κυνός), genitive of kýōn (κύων), dog; odon, Latinized and grammatically adjusted from the Greek nominative ὀδούς (odoús), tooth, referring to highly developed pair of canine teeth

Cynodon gibbus (Agassiz 1829) Latin for humped, referring to gibbous (convex) keel or ventral profile

Cynodon meionactis Géry, Le Bail & Keith 1999 meióō (Gr. μειόω), to lessen or diminish, i.e., shortened or curtailed; aktís (Gr. ἀκτίς), ray, referring to shorter anal fin compared with C. gibbus

Cynodon septenarius Toledo-Piza 2000 Latin for containing seven, referring to seven branched pelvic-fin rays

Hydrolycus Müller & Troschel 1844 hydro-, combining form of hýdōr (Gr. ὕδωρ), water; lýkos (Gr. λύκος), wolf, referring to elongated lower canine teeth

Hydrolycus armatus (Jardine 1841) Latin for armed with a weapon, a “remarkable and strongly armed fish,” referring to elongated lower canine teeth

Hydrolycus scomberoides (Cuvier 1819) –oides, Neo-Latin from eī́dos (Gr. εἶδος): Scomber, a genus of mackerel, comparison not explained, possibly referring to overall shape and silvery coloration

Hydrolycus tatauaia Toledo-Piza, Menezes & Santos 1999 tata and uai, Tupí words for fire and tail, respectively, referring to orange coloration pattern in caudal fin

Hydrolycus wallacei Toledo-Piza, Menezes & Santos 1999 in honor of English naturalist Alfred Russel Wallace (1823–1913), who illustrated this species during his 1848–1852 expedition to the Amazon

Rhaphiodon Agassiz 1829 rhaphís (Gr. ῥαφίς), needle; odon, Latinized and grammatically adjusted from the Greek nominative ὀδούς (odoús), tooth, referring to highly developed pair of canine teeth

Rhaphiodon vulpinus Spix & Agassiz 1829 Latin for fox-like, referring to highly developed pair of canine teeth