There is not a lot known of this
family in the aquatic literature. There are five species known,
N. furcatus Ribeiro, Pedroza & Rapp Py-Daniel,
2011, N. lanceolatus Eigenmann & Eigenmann, 1889,
N. mariai, (Schultz, 1944), N.
panamensis (Bussing, 1970), and N. pauciradiatus Ferraris,
1988. The thumbnail image shown could be one of those named
species or a new discovery.