Massartella

Souto, Paula Malaquias, Da-Silva, Elidiomar Ribeiro & Nessimian, Jorge Luiz, 2013, Description of the nymph of Massartella alegrettae Ulmer, 1943 (Ephemeroptera: Leptophlebiidae: Atalophlebiinae) with a key to Massartella Lestage, 1930 nymphs, Zootaxa 3681 (5), pp. 583-588 : 587-588

Key to species of Massartella mature nymphs

1 Gills present on abdominal segments I–V................................................. Massartella alegrettae

- Gills present on abdominal segments I–VI.................................................................. 2

2 Dorsal portion of gills with well-developed apical process ( Fig. 15 ); abdominal sterna with prominent thick setae................................................................................................ Massartella brieni

- Dorsal portion of gills with short apical process or without apical process ( Figs. 16–18 ); abdominal sterna glabrous........ 3

3 Dorsal portion of gills without apical processes ( Fig. 17 )...................................... Massartella devani

- Dorsal portion of gills with short apical process ( Figs. 16, 18 )................................................. 4

4 Mandibles with thick median hair tuft on outer margin................................... Massartella venezuelensis

- Mandibles with outer margin completely covered by a dense row of long setae...................... Massartella hirsuta

Figures

FIGURES 15 – 18. Massartella gills. 15. M. brieni; 16. M. venezuelensis; 17. M. devani; 18. M. hirsuta. Figs. 15 and 16 modified from Pescador & Peters (1990); 17 from Derka (2002); 18 from Derka (2009).