Parachironomus

Trivinho-Strixino, Susana, Silva, Fabio Laurindo Da & Roque, Fabio Oliveira, 2010, A new species of Parachironomus Lenz, 1921 (Diptera: Chironomidae: Chironominae), and description of immature stages of two other species from the Neotropical Region, Zootaxa 2689, pp. 1-14 : 13-14

Key to larvae of four Parachironomus species from Brazil

1. Mentum with 6th lateral tooth larger than 5th and set forward; ventromental plates with anterior margin strongly scalloped; premandible with 3 teeth, proximal tooth wider .......................................................................... P. lupus sp. n.

- Mentum with 6th lateral tooth shorter than 5th lateral; ventromental plates with anterior margin crenulated; premandible with proximal teeth not as above .......................................................................................................................... 2

2. Mentum with 4th and 5th lateral teeth shorter than 3rd and 6th (forming two concave arcs); premandible with proximal tooth very short ........................................................................................................................................ P. longistilus

- Mentum with lateral teeth decreasing gradually (not forming concave arcs) ............................................................. 3

3. 7th lateral tooth of mentum divided into 3 or 4 denticles clearer than others; premandible with 3 teeth decreasing gradually ........................................................................................................................................................ P. cayapo

- 7th lateral tooth of mentum not divided, shorter than 6th lateral and clearer than others; premandible with proximal tooth shorter ...................................................................................................................................................... P. tirio