Macrelmis, Motschulsky, 1859

Curiel, Josefina & Morrone, Juan J., 2012, Association of larvae and adults of Mexican species of Macrelmis (Coleoptera: Elmidae): a preliminary analysis using DNA sequences, Zootaxa 3361 (1), pp. 56-62 : 58-59

Key to larvae of Macrelmis

1a. Anterior corner of pronotum blunt; first ventrite with short longitudinal carina; emargination of segment IX shallow....... 2 1b. Anterior corner of pronotum sharp; first ventrite with semicircular depression bearing a short transverse carina; emargination of segment IX deep and with two strong teeth............................................................... 5

2a. Outer margin of mandible with long and simple seta................................................ M. granigera

2b. Outer margin of mandible lacking setae or with a ramose seta................................................... 3

3a. Cardo subtriangular, bearing a short fringed seta.................................................... M. saltensis

3b. Cardo irregular, without setae............................................................................ 4

4a. Pronotum with 16 depressions: six median, four lateral and six posterior................................ M. scutellaris

4b. Pronotum with 14 depressions: six median, two lateral and six posterior................................. M. species 7

5a. Outer margin of mandible lacking setae or with one seta....................................................... 6

5b. Outer margin of mandible with two setae................................................................... 8

6a. Outer margin of mandible lacking setae.......................................................... M. species 12

6b. Outer margin of mandible with one short ramose seta......................................................... 7

7a. Terga 1–7 with one pair of long branched setae close to midline............................................. M. isis

7b. Terga 1–7 with six long setae in middle portion and with one lateral seta................................ M. species 10

8a. Ventral basal region of head with two oblique rows of six short, strong setae; terga 1–4 with sagital line......... M. leonilae

8b. Ventral basal region of head with two oblique rows of seven short, strong setae; terga 1–5 with sagital line..... M. species 11