Mesoleptobasis

Garrison, Rosser W. & Ellenrieder, Natalia Von, 2009, Redefinition of Mesoleptobasis Sjöstedt 1918 with the inclusion of Metaleptobasis cyanolineata (Wasscher 1998) comb. nov. and description of a new species, Mesoleptobasis elongata (Odonata: Coenagrionidae), Zootaxa 2145, pp. 47-68 : 51

Key to Males of Mesoleptobasis

1. Costal side of FW pt shorter than basal side, its posterior margin strongly convex ( Fig. 10 a); prothoracic projections in anterior view with no common stem, acuminate apices directed laterally ( Fig. 4 a); attenuate cercus dorsally with a membranous central area ( Fig. 17 a); genital ligula in ectal view with distal margin transverse and lateral sub-apical deep emarginations ( Fig. 14 a); Amazonian region of Peru ( Fig. 21 ) ................................................. M. acuminata

1'. Costal side of FW pt longer than basal side, its posterior margin slightly convex ( Figs. 10 b, 11a–c); prothoracic projections in anterior view with a common stem, apices directed dorso-laterally ( Fig. 4 c) or laterally ( Figs. 4 b, d, e); cercus dorsally lacking a membranous area ( Figs. 17 b–e, 19); genital ligula in ectal view with distal margin deeply bifid and lacking lateral emarginations ( Figs. 14 b–e) ................................................................................................ 2

2. Prothoracic projections in anterior view with apices directed dorso-laterally ( Fig. 4 c); CuA ending four cells distal to vein descending from subnodus ( Fig. 11 a); posterior margin of S10 recessed and with a medio-dorsal emargination, lacking postero-lateral processes ( Fig. 17 c); cercus strongly arched, curled over itself with tip directed antero-ventrally ( Figs. 17 c, 18c); paraproct robust and basally as high as half of S10 height in lateral view ( Fig. 18 c); genital ligula in lateral view with basal lobe low and dorsal margin of lateral lobe denticulate ( Fig. 15 c); Guyana and Saramacca and Marowijne Districts of Surinam ( Fig. 21 ) ............................................................. M. cyanolineata

2'. Prothoracic projections in anterior view with apices directed laterally ( Figs. 4 b, d, e); CuA ending two cells proximal to two cells distally to vein descending from subnodus ( Figs. 10 b, 11b, c); posterior margin of S10 projected medio-dorsally, with a pair of postero-lateral small lobe-like processes ( Figs. 17 b, d, e, 19a–c); cercus smoothly curved, with tip directed postero-ventrally ( Figs. 17 b, d, e); paraproct slender and basally narrower than half of S10 height in lateral view ( Figs. 18 b, d, e); genital ligula in lateral view with basal lobe long, sclerotized, and pointed, and dorsal margin of lateral lobe with a single spine ( Figs. 15 b, d, e) ................................................................. 3

3. Cercus oblong, longer than wide, and usually armed at tip with a small externally recurved tooth ( Figs. 17 b, 19a); Amazonas and Rondônia States in Brazil ( Fig. 21 ) .................................................................................... M. cantralli

3'. Cercus approximately semicircular, about as long as wide, lacking a small externally recurved tooth at tip ( Figs. 17 d, e, 19b–e) ............................................................................................................................................... 4

4. Base of paraproct with a thumb-like tubercle ( Fig. 18 d); FW CuA ending one or two cells proximal to vein descending from subnodus ( Fig. 11 b); abdomen longer: 37–40 mm ( Fig. 20 a); Para District in Surinam and Amazonas State in Brazil ( Fig. 21 ) ........................................................................................................................................ M. elongata

4'. Base of paraproct slightly convex, lacking a thumb-like tubercle ( Fig. 18 e); FW CuA ending at or one or two cells distal to subnodus ( Fig. 11 c); abdomen shorter: 31–33 mm ( Fig. 20 b); Amazonas State in Venezuela and Amazonas and Rondônia States in Brazil ( Fig. 21 ) ................................................................................................ M. incus

Figures

FIGURE 10. Male wings. (a) Mesoleptobasis acuminata, Peru, Explorama Lodge; (b) M. cantralli, paratype, Brazil, Porto Velho.

FIGURE 11. Male wings. (a) Mesoleptobasis cyanolineata, paratype, Surinam, Mungatapoe; (b) M. elongata, paratype, Brazil, Rio Curari; (c) M. incus, lectotype, Brazil, Rio Autaz.

FIGURE 14. Genital ligula, ectal view. (a) Mesoleptobasis acuminata, Peru, Explorama Lodge; (b) M. cantralli, paratype, Brazil, Porto Velho; (c) M. cyanolineata, paratype, Surinam, Mungatapoe; (d) M. elongata, holotype; (e) M. incus, lectotype, Brazil, Rio Autaz.

FIGURE 17. Male S 10, medio-dorsal view. (a) Mesoleptobasis acuminata, Peru, Explorama Lodge; (b) M. cantralli, paratype, Brazil, Porto Velho; (c) M. cyanolineata, paratype, Surinam, Mungatapoe; (d) M. elongata, holotype; (e) M. incus, lectotype, Brazil, Rio Autaz.

FIGURE 20. Male habitus, lateral view (to scale). (a) Mesoleptobasis elongata, holotype; (c) M. incus, Brazil, Porto Velho.

FIGURE 21. Distribution of Mesoleptobasis.