Mesoleptobasis incus Sjöstedt 1918

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 : 64-67

Mesoleptobasis incus Sjöstedt 1918

Figs. 1 a, 3f, 4e, 5f, g, 7e, 11c, 13c, 14e, 15e, 16e, 17e, 18e, 19c, e, 20b, 21

Mesoleptobasis incus Sjöstedt 1918: 22 –23 (description of 3 and Ƥ); — St. Quentin 1960: 51 (illustration of FW base); — Davies 1981: 2; — Bridges 1994: VII.114 (catalog); — Lencioni 2006: 161 (notes and reproduction of original illustrations).

Mesoleptobasis inca — Davies & Tobin 1984: 77 (catalog); — Steinmann, 1997: 288 (catalog); — Tsuda 2000: 39 (catalog); — Heckman 2008: 395 (key and reproduction of original illustrations).

Types. Lectotype by present designation (from Rio Autaz, Amazonas, Brazil) in NHRS (examined).

Specimens examined. Total: 8 3, 15 Ƥ. Brazil, Amazonas State: 1 3 lectotype, Rio Autaz, W to lower Madeira River, S. Amelia, forest (4°24'51"S, 59°56'21"W), viii 1914, leg. A. Roman (NHRS); 2 3, Tefé (3°22'S, 64°42'W, 43 m), i 1962, leg. A. Carvalho (ABMM); 1 3, same but Amana Lake, i 1991, leg. J. Ribeiro (ABMM); 1 3 paralectotype, 2 Ƥ paralectotypes, same but ix 1914 (NHRS); Rondônia State: 1 Ƥ, Porto Velho (8°46'S, 63°53'W), 0 3 ii 1922, leg. J.H. Williamson & J.W. Strohm (UMMZ); 2 Ƥ, same but 0 6 ii 1922 (UMMZ); 2 Ƥ, same but (FSCA); 2 Ƥ, same but (IORI); 1 3, 1 Ƥ, same but 13 ii 1922 (UMMZ); 1 3, 1 Ƥ, same but 21 ii 1922 (UMMZ); 1 3, 1 Ƥ, same but 22 ii 1922 (FSCA); 2 Ƥ, same but 27 ii 1922 (UMMZ); 1 Ƥ, same but 14 v 1922 (RWG).

Diagnosis. Male prothorax with medial bifurcate process with arms directed laterally forming a transverse line between them ( Fig. 3 f; shared with M. cantralli and M. elongata ); female prothorax lacking processes, with posterior margin slightly trilobate, with medial lobe not surpassing lateral lobes posteriorly; lateral lobes bent anteriorly ( Figs. 5 f, g; unique). Costal side of FW pt longer than basal side, its posterior margin slightly convex in both sexes ( Figs. 11 c, 13c; shared with M. cantralli , M. cyanolineata , and M. elongata ). FW CuA relatively short ( Figs. 11 c, 13c; shared with M. cantralli and M. elongata ), ending at vein descending from subnodus to two cells distal in male and four cells distal in female. Genital ligula in ectal view with distal margin deeply bifid and lacking lateral emarginations ( Fig. 14 d; shared with M. cantralli , M. cyanolineata , and M. elongata ); in lateral view with basal lobe sclerotized, long, pointed, and directed posteriorly, and dorsal margin of lateral lobe with a single small sclerotized spine ( Fig. 15 e; shared with M. cantralli ). Posterior margin of S10 projected medio-dorsally, with a pair of postero-lateral small lobe-like processes ( Figs. 17 e, 19c; shared with M. cantralli and M. elongata ). Male cercus lacking a membranous area dorsally (shared with M. cantralli , M. cyanolineata , and M. elongata ), approximately semicircular, as long as wide ( Figs. 17 e, 19c, e; shared with M. elongata ); in lateral view smoothly curved, with tip directed posteroventrally ( Fig. 18 e); paraproct slender and narrower than half of S10 height at base in lateral view ( Fig. 18 e; shared with M. cantralli and M. elongata ); base of paraproct lacking a thumb-like tubercle (shared with M. acuminata and M. cyanolineata ). Ovipositor surpassing tip of cerci for a distance shorter than length of cerci ( Fig. 16 e; shared with M. acuminata and M. cyanolineata ).

Dimensions. Males (n 6; mean in parenthesis): Hw 16.9–19.5 (17.8); abdomen 31.0–33.0 (32.2); total length 37.0–38.0 (37.5). Females (n 10): Hw 19.0–20.0 (19.4); abdomen 30.0–32.0 (30.3); total length 35.0–37.0 (36.4).

Remarks. Sjöstedt (1918) described M. incus based on a syntype series of four males and three females. We designate here a male labeled (all printed unless noted otherwise) 'Amazon/ Roman, Rio/Autaz, aug., Mesoleptobasis /3 incus n. sp. [written]/Yngve Sjöstedt det.' as lectotype, and provide illustrations of its diagnostic structures ( Figs 1 a, 3f, 4e, 11c, 14e, 15e, 17e, 18e, 19c). The small series collected by J.H. Williamson and J.S. Strohm in 1922 was identified by E.B. Williamson as M. incus although there is no evidence that he ever compared them directly with Sjöstedt's types. The series of males from Rondônia agree with the lectotype ( Fig. 19 c) except that the cercus in dorsal view is more strongly excavated laterally ( Fig. 19 e).

Distribution. Amazonas State in Venezuela and Amazonas and Rondônia States in Brazil, sympatric with M. cantralli in the latter ( Fig. 21 ).

Figures

FIGURE 3. Pronotum, lateral view. (a) Mesoleptobasis acuminata, male Peru, Explorama Lodge; (b) M. cantralli, male paratype, Brazil, Porto Velho; (c) M. cyanolineata, male paratype, Surinam, Mungatapoe; (d) M. cyanolineata, female paratype, Surinam, Mungatapoe; (e) M. elongata, holotype; (f) M. incus, lectotype, Brazil, Rio Autaz.

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 16. Female S 8 – 10, lateral 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, paralectotype, 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 19. Male S 10, dorsal view. (a) Mesoleptobasis cantralli, paratype, Brazil, Porto Velho; (b) M. elongata, Brazil, Rio Curari; (c) M. incus, lectotype, Brazil, Rio Autaz; (d) detail right cercus, M. elongata, Brazil, Rio Curari; (e) detail right cercus, M. incus, Brazil, Porto Velho.

FIGURE 21. Distribution of Mesoleptobasis.