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: Co, Zootaxa 2145, pp. 47-68: 51

publication ID

http://doi.org/ 10.5281/zenodo.188653

persistent identifier

http://treatment.plazi.org/id/03FC87D3-EB06-FF84-01B2-FCFE87F3454F

treatment provided by

Plazi

scientific name

Mesoleptobasis
status

 

Key to Males of Mesoleptobasis 

1. Costal side of FW pt shorter than basal side, its posterior margin strongly convex ( Fig. 10View FIGURE 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. 17View FIGURE 17 a); genital ligula in ectal view with distal margin transverse and lateral sub-apical deep emarginations ( Fig. 14View FIGURE 14 a); Amazonian region of Peru ( Fig. 21View FIGURE 21) ................................................. M. acuminata 

1 '. Costal side of FW pt longer than basal side, its posterior margin slightly convex ( Figs. 10View FIGURE 10 b, 11 a –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. 17View FIGURE 17 b –e, 19); genital ligula in ectal view with distal margin deeply bifid and lacking lateral emarginations ( Figs. 14View FIGURE 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. 11View FIGURE 11 a); posterior margin of S 10 recessed and with a medio-dorsal emargination, lacking postero-lateral processes ( Fig. 17View FIGURE 17 c); cercus strongly arched, curled over itself with tip directed antero-ventrally ( Figs. 17View FIGURE 17 c, 18 c); paraproct robust and basally as high as half of S 10 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. 21View FIGURE 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. 10View FIGURE 10 b, 11 b, c); posterior margin of S 10 projected medio-dorsally, with a pair of postero-lateral small lobe-like processes ( Figs. 17View FIGURE 17 b, d, e, 19 a –c); cercus smoothly curved, with tip directed postero-ventrally ( Figs. 17View FIGURE 17 b, d, e); paraproct slender and basally narrower than half of S 10 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. 17View FIGURE 17 b, 19 a); Amazonas and Rondônia States in Brazil ( Fig. 21View FIGURE 21) .................................................................................... M. cantralli 

3 '. Cercus approximately semicircular, about as long as wide, lacking a small externally recurved tooth at tip ( Figs. 17View FIGURE 17 d, e, 19 b –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. 11View FIGURE 11 b); abdomen longer: 37–40 mm ( Fig. 20View FIGURE 20 a); Para District in Surinam and Amazonas State in Brazil ( Fig. 21View FIGURE 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. 11View FIGURE 11 c); abdomen shorter: 31–33 mm ( Fig. 20View FIGURE 20 b); Amazonas State in Venezuela and Amazonas and Rondônia States in Brazil ( Fig. 21View FIGURE 21) ................................................................................................ M. incus