Macrothemis

Costa, Janira M., Carriço, César & Santos, Tatiana C., 2010, Description of the final instar of Macrothemis heteronycha (Calvert) (Anisoptera: Libellulidae), Zootaxa 2506, pp. 65-68 : 67

Key to known Macrothemis larvae

1. The characters of larvae of all species, except M. heteronycha and M. musiva , were taken from the literature. Abdominal segment II with a dorsal hook .................................................................................................................... 2

-. Abdominal segment II without a dorsal protuberance.................................................................................................. 5

2 Dorsal protuberances on tergites VI–IX absent, total length of mature larva 15mm...................................... meurgeyi

- Dorsal protuberances present........................................................................................................................................ 3

3. Dorsal protuberances on tergites VII–IX strongly developed, spine-like; total length of full-grown larva 13 mm............................................................................................................................................................................ inequinguis

- Dorsal protuberances on tergites VII–IX low or vestigial; total length of full- grown larva 16 mm........................... 4

4. Dorsal protuberances on tergites VII-IX low and spine-like ................................................................................ ultima

- Dorsal protuberances on tergites VII-IX vestigial .................................................................................... aurimaculata

5. Palpal setae 4; palpal crenulations 9.................................................................................................................... musiva

- Palpal setae more than 4; palpal crenulations 7............................................................................................................ 6

6. Labial palp with deep crenulations ............................................................................................................................... 7

- Labial palp with obsoletecrenulations .......................................................................................................................... 8

7. Mandibular formula L 1234 0 abb R 123 + 4 yab ................................................................................................. hahneli

- Mandibular formula L 1234 ab R 1234 y abd ............................................................................................ heteronycha

8. Movable hook thick ( Fig. 10 ) ....................................................................................................................................... 9

- Movable hook thin ( Fig. 11 ) ..................................................................................................................... pseudimitans

9. Dorsal protuberances on abdominal segment VII–IX reduced, notably smaller than preceding ones; Antillean .......... .............................................................................................................................................................................. celeno

- Dorsal protuberances on abdominal segment VII–IX well developed, similar to preceding ones; USA to South America............................................................................................................................................................... inacuta

Figures

FIGURE 1 – 11. Macrothemis heteronycha: (1) larva, dorsal view; (2) antenna; (3) labium; (4) labial palp; (5) left mandible; (6) right mandible; (7) prothoracic process; (8) abdomen, lateral view; (9) caudal appendages, dorsal view (10) Macrothemis inacuta, labial palp (after Novelo-Gutiérrez & Ramirez, 1998), (11). Macrothemis pseudimitans, labial palp (after Limongi, 1989).