Sternarchogiton nattereri
... that male and female Sternarchogiton nattereri knifefish are so different that males were thought to be members of a different genus for 40 years?
... that male and female <i id="mwDi8"><b id="mwDjA"><a href="./Sternarchogiton_nattereri" id="mwDjE" rel="mw:WikiLink" title="Sternarchogiton nattereri">Sternarchogiton nattereri</a></b></i> <a class="mw-disambig" href="./Knifefish" id="mwDjI" rel="mw:WikiLink" title="Knifefish">knifefish</a> are <a href="./Sexual_dimorphism" id="mwDjM" rel="mw:WikiLink" title="Sexual dimorphism">so different</a> that males were thought to be members of a different <a href="./Genus" id="mwDjQ" rel="mw:WikiLink" title="Genus">genus</a> for 40 years?