there are many species:
Sternarchorhynchus britskii Campos-da-Paz, 2000.
Sternarchorhynchus curumim de Santana & Crampton, 2006.[8]
Sternarchorhynchus curvirostris (Boulenger, 1887).
Sternarchorhynchus mesensis Campos-da-Paz, 2000.
Sternarchorhynchus mormyrus (Steindachner, 1868).
Sternarchorhynchus oxyrhynchus (Müller & Troschel, 1849).
Sternarchorhynchus roseni Mago-Leccia, 1994.
Most common in the trade (as if any are common) I think would be oxyythynchus. See if this guy looks familiar:
http://www.monsterfishkeepers.com/forums/showthread.php?t=29642&highlight=elephant+nose
Sternarchorhynchus britskii Campos-da-Paz, 2000.
Sternarchorhynchus curumim de Santana & Crampton, 2006.[8]
Sternarchorhynchus curvirostris (Boulenger, 1887).
Sternarchorhynchus mesensis Campos-da-Paz, 2000.
Sternarchorhynchus mormyrus (Steindachner, 1868).
Sternarchorhynchus oxyrhynchus (Müller & Troschel, 1849).
Sternarchorhynchus roseni Mago-Leccia, 1994.
Most common in the trade (as if any are common) I think would be oxyythynchus. See if this guy looks familiar:
http://www.monsterfishkeepers.com/forums/showthread.php?t=29642&highlight=elephant+nose