Distinguished from T. quadrifilis
in the alignment of the lateral margins of the head in the region
from the anterior margin of the orbit to the posterior limit of
the opercle (running approximately in parallel from ventral view
vs. diverging laterally, respectively); in the body width at the
pectoral-fin insertion as a proportion of the head width at the
posterior margin of the orbit (0.99-1.10 vs. 1.17-1.25, respectively);
in the distance from the tip of the snout to the anal fin origin
(0.29-0.32 of SL vs. 0.33-0.36 of SL, respectively); and in the
position of the anterior termination of the gill opening (one
orbital diameter posterior of the transverse plane running through
the posterior margin of the orbit vs. positioned in the transverse
plane running through the center of the orbit, respectively).
Wallace's Driftwood Dolphin
South America : Amazon
basin: upper Negro River system in Brazil and Venezuela and upper
Orinoco River basin in southern Venezuela.
Vari, R.P. and C. Ferraris,
Jr. 2006 The catfish genus Tetranematichthys (Aucheniptridae).