Characidium

1. Lateral line incompletely pored; orbit large, contained 2.3 to 3.2 times in head length .................... Characidium sp.

1’. Lateral line completely pored; orbit small, contained 3.5 to 4.4 times in head length ............................................ 2

2. Isthmus and region between pectoral fins without scales; fins with dark-brown stripes.................................. C. gomesi

2’. Isthmus and region between pectoral fins covered by scales; fins hyaline ............................................ C. aff. zebra