Key to adult Trichoribates species from the Neotropical region

1. Lamellar cusp longer than length of lamella (excluding cusp), with outer tooth present, medial tooth absent; notogastral porose area Aa rounded; rostrum rounded; body length 464–614..................................... T. sidorchukae sp. nov.

- Lamellar cusp shorter than half length of lamella (excluding cusp); medial and lateral teeth present, or cusps rounded distally; notogastral porose area Aa rounded or oval; rostrum rounded or serrate.......................................... 2

2. Notogastral porose area Aa oval; rostrum rounded; distance h 1 -h 1 less than length h 1; body length 620.................................................................................................. T. hammerae Subías, 2010

- Notogastral porose area Aa rounded; rostrum serrate; distance h 1 -h 1 greater than length h 1; body length 440–473.............................................................................. T. serratus C. & C., jr. Pérez-Íñigo, 1993