Key to the known Neotropical and Nearctic larvae of Monopelopia

1. Dark claw on the posterior parapod present ................................................................................................................. 2

-. Only light colored claws present ................................................................................................................................. 4

2. Teeth of ligula in relatively straight line; procercus length/width 3.0 or less; USA, Colombia ..................................... .............................................................................................................................................. M. boliekae Beck & Beck

- Teeth of ligula in concave arc; procercus length/width more than 3.0 ......................................................................... 3

3. AR 3.12 – 3.35; posterior parapods with lateral hooklets on shaft, one dark brown hooked claw with 3 inner teeth and one dark brown simple apically; Brazil ................................................................................. M. paranaense sp. n.

-. AR 3.39 – 3.70; posterior parapods with dark brown hooked claw with 2 inner teeth; USA, Europe........................... ................................................................................................................................................ M. tenuicalcar (Kieffer)

4. AR 2.22 – 2.53; Jamaica ......................................................................................................... M. mikeschwartzi Epler

- AR above 3.0 .............................................................................................................................................................. 5

5. AR 3.8; USA ....................................................................................................................... M. tillandsia Beck & Beck

- AR 3.0 – 3.18: Brazil .............................................................................. M. caraguata Mendes, Marcondes & Pinho