Amblycerus insuturatus ( Pic, 1902 )

Santos, Aluska Tavares Dos & Ribeiro-Costa, Cibele Stramare, 2019, Rearrangements in some species groups of Amblycerus Thunberg, 1815 (Coleoptera: Chrysomelidae: Bruchinae) including keys, description of a new species, new host plant and distributional records, Zootaxa 4701 (2), pp. 101-148 : 117-119

Amblycerus insuturatus ( Pic, 1902)

( Figs 4 , 11 , 24 , 37 , 50 , 65, 66, 80, 93, 99, 118)

Spermophagus subflavidus var. insuturatus Pic, 1902: 172 (desc., distr.). For review of literature, see Ribeiro-Costa et al. (2018).

Types. This species was recognized using the original description and the works of Ribeiro-Costa ( Ribeiro-Costa 1995; Kingsolver & Ribeiro-Costa 1997; Ribeiro-Costa et al. 2018), where the male genitalia is illustrated. The type material of A. insuturatus as well as of its synonyms were examined by Kingsolver & Ribeiro-Costa (1997). Readers are referred to Ribeiro-Costa et al. (2018) for a full synonymic list.

Additional specimens examined. [1 male specimen]: Brasil Pará\ Serra Norte\ POJUCA [handwritten]\ 19. VII. 1983 \ Col. R. B. Neto; Armadilha\ Suspensa\ 3 MTS.; MPEG 01019973; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos; C. S. Ribeiro-Costa, 2017. ( MPEG). [1 male specimen]: BOLIVIA: Santa Cruz, 3.7km\ SSE Buena Vista, Hotel Flora & Fauna 405m., 5-15-XI-2001 \ 17º29.949’S; 63º33.152W \ M. C. Thomas & B. K. Dozier\ tropical transition Forest; Amblycerus \ insuturatus\ (Pic)\ det. J. M. Kingsolver; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( FSCA). [1 female specimen]: BOLIVIA Santa Cruz \ 4-6k SSE Buena Vista\ F & F Hotel Oct 22-31 \ 2002 Wappes & Morris; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( FSCA). [1 female specimen]: BOLIVIA, Santa Cruz \ Potrerillos del Guerda\ 16-22 Oct 2006 370m \ Wappes, Nearns & Eya; Snake Farm\ 17º40.26S, 063º27.43W \ Elevation 400 meters; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( FSCA). [1 male specimen]: BOLIVIA, Santa Cruz Prov. \ 4-6 km SSE Buena Vista\ Hotel Fauna y Flora 400-500m \ 17º37’S, 63º37’W \ 1-10 Nov 2002 beating\ Steven W. Lingafelter; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos; C. S. Ribeiro-Costa, 2017. ( USNM). [1 male specimen]: Brasil, Mato Grosso, Barra do\ Garças, PE da Serra Azul\ VII/2009 \ J. de Farias (leg.); 15º50153”S 52º16’56”\ 15º50’53”S 52º16’56”W; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( DZUP). [1 male specimen]: Brasil, Mato Grosso, Barra do\ Garças, PE da Serra Azul\ VII/2009 \ J. de Farias (leg.); 15º50153”S 52º16’56”\ 15º50’53”S 52º16’56”W; Amblycerus insuturatus \ ( Pic, 1902)\ Ribeiro-Costa, C. S. det. 2010; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( DZUP). [5 specimens females]: Brasil, Mato Grosso, Barra do\ Garças, PE da Serra Azul\ VII/2009 \ J. de Farias (leg.); 15º50153”S 52º16’56”\ 15º50’53”S 52º16’56”W; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( DZUP). [1 male specimen]: Brasil—GO Barro Alto\ 15º4’44.50’S 49º0’6.70”W \ V.2009 M. Pimenta & L. L.\ Bergamini cds. Malaise; Chrysomelidae \ Bruchinae sp.4—RS31\ L. L. Bergamini det. 2010; Amblycerus insuturatus \ ( Pic, 1902)\ Vieira, M. K. det. 2011; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos, 2018. ( DZUP). [1 male specimen]: Brasil- RJ- Cabo Frio\ Praia do Peró\ 15/ iii/ 2015 \ J. H. Viana col.; Amblycerus insuturatus \ ( Pic, 1902)\ Det.: A. T. Santos; C. S. Ribeiro-Costa, 2017. ( DZUP).

Diagnosis ( Figs 24 , 93 , 99 ). Amblycerus insuturatus is characterized by the median lobe of male genitalia about 5.0 times as long as its greatest width at apical region ( Figs 93 , 99 ); internal sac in the apical region with a pair of hollow, ovoid, tuberculate sclerites and with median wishbone sclerite. Amblycerus insuturatus is similar externally to A. goianensis Santos & Ribeiro-Costa , sp. n., which differs by the indistinct frontoclypeal suture (distinct in A. goianiensis Santos & Ribeiro-Costa , sp. n.), cervical boss with three setae (four setae in A. goianiensis Santos & Ribeiro-Costa , sp. n.), ventrite V almost as long as ventrite IV (almost two times as long as ventrite IV in A. goianiensis Santos & Ribeiro-Costa , sp. n.), internal sac of male genitalia in the apical region with a pair of ovoid sclerites (subtriangular sclerites in A. goianiensis Santos & Ribeiro-Costa , sp. n.), unpaired median wishbone sclerite (subtrapezoidal in A. goianiensis Santos & Ribeiro-Costa , sp. n.).

Redescription. Measurements. BL: 10.7 mm; BW: 5.5 mm.

Integument color ( Figs 11 , 37 , 80 ). Pronotum, elytra and abdomen red, head and ventral region entirely dark red.

Vestiture ( Figs 11 , 37 , 50 , 80 ). Body covered with orange setae. Pronotum with setae uniformly distributed or forming two dense median patches ( Fig. 50 ). Elytra orange, sometimes with gray setae along interestriae margins ( Fig. 11 ). Scutellum light yellow. Pygidium with median stripe of light-yellow setae ( Fig. 80 ).

Head ( Fig. 24 ). Frons covered with fine and moderately dense coarse punctures, without frontal carina. Eyes distant from each other anteriorly, ocular index: 4.4; ocular sinus: 1.1 and postocular lobe about 0.3 the eye length. Antennae not reaching anterior margin of hindcoxae, serrate from antennomeres 4–10 ( Fig. 37 ); antennomere 7 about 1.7 longer than wide, last antennomere subelliptic. Frontoclypeal suture indistinct. Clypeus covered with only moderately coarse punctures except at apex. Labrum with few fine punctures on basal margin. Prothorax ( Fig. 50 ). Pronotum trapezoidal with lateral margins slightly curved, covered laterally by coarse and dense punctures ( Fig. 50 ); lateral carina almost reaching the posterior margin of pronotum; cervical boss with three setae; cervical sulcus conspicuous behind eyes. Prosternal process longer than anterior coxae, gently arched between coxae and slightly constricted between coxae. Meso- and metathorax ( Figs 11 , 37 , 65, 66). Scutellum about 1.5 longer than wide, tridentate, median tooth longer than the lateral ones (Figs 65, 66). Elytra with striae strongly impressed, at basal third striae 1–6 with punctures more isolated, all striae free apically ( Fig. 11 ). Metepisternum with moderately coarse and sparse punctures ( Fig. 37 ); metepisternal sulcus with transverse axis gently oblique or straight; the longitudinal axis about half the length of metepisternum. Metaventrite not prominent in lateral view, without punctures and median sulcus about as half as long as metaventrite ( Fig. 37 ). Metacoxae with coarse punctures ( Fig. 37 ). Hindtibia with lateral spur about 1.9 times the length of median spur ( Fig. 37 ). Basal tarsomere about 1.6 the length of the lateral spur and 3.0 times the length median spur. Abdomen ( Figs 37 , 80 ). Ventrites without moderately coarse punctures ( Fig. 37 ); last ventrite almost as long as the ventrite IV. Pygidium with apical margin rounded and with dense and moderately coarse punctures ( Fig. 80 ).

Male genitalia ( Figs 93 , 99 ). Median lobe of male genitalia about 5.0 times as long as its greatest width at apical region ( Fig. 93 ). Ventral valve with lateral margins almost straight and acuminate apex, dorsal valve subtriangular, with lateral margins almost straight, rounded apically. Internal sac in the apical region with a pair of hollow, ovoid, tuberculate sclerites ( Fig. 93 ). Median region with a pair of blades serrate at lateral margins and apex and with unpaired wishbone sclerite. Basal region with several small denticles close to ejaculatory duct. Tegmen with moderate rounded emargination between enlarged lateral lobes ( Fig. 99 ). Female. Similar to male except for ventrite V not emarginate and pygidium with apical margin bilobed.

Distribution ( Fig. 118 ). Puerto Rico, Suriname, French Guiana, Brazil (Pará, Mato Grosso, Goiás, Ceará, Rio Grande do Norte, Rio de Janeiro), Bolivia.

Life History. Amblycerus insuturatus and two species of birds, Ara ararauna ( Linnaeus, 1758) and Ara chloropterus (Gray, 1859) were recognized as pre-dispersal seed predators of the Buchenavia tomentosa (Combretaceae) by Farias et al. (2015). According to the authors, the seed beetles were found in fruits collected directly from the crown of trees and about 2.79% of the fruits had signs of emergence, with endosperm and embryo completely consumed.

Host plants (Tab. II). Combretaceae : Terminalia corrugata (Ducke) Gere & Boatwr. , Terminalia tetraphylla (Aubl.) Gere & Boatwr.

Figures

FIGURES 1–8. Amblycerus dispar: 1. dorsal; 2. scutellum. A. taeniopygus: 3. head, A. insuturatus: 4. lateral. A. alternatus: 5. detail of coarse punctures on median region of pronotum; 6. detail of coarse punctures on median region of pygidium. A. crassipunctatus: 7–8. Male genitalia: 7. Median lobe; 8. Tegmen. Scale bars = 1.0 mm (Figs 5, 7, 8) and 0.25 mm (Fig. 12).

FIGURES 9–14. Dorsal, group dispar: 9. Amblycerus crassipunctatus, 10. A. dispar, 11. A. insuturatus, 12. A. schwarzi, 13. A. taeniopygus and 14. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 1.0 mm.

FIGURES 22–27. Head, group dispar: 22. Amblycerus crassipunctatus, 23. A. dispar, 24. A. insuturatus, 25. A. schwarzi, 26. A. taeniopygus, 27. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 1.0 mm.

FIGURES 35–40. Lateral. group dispar: 35. Amblycerus crassipunctatus, 36. A. dispar, 37. A. insuturatus, 38. A. schwarzi, 39. A. taeniopygus and 40. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 1.0 mm.

FIGURES 48–53. Pronotum, group dispar: 48. Amblycerus crassipunctatus. 49. A. dispar. 50. A. insuturatus. 51. A. schwarzi. 52. A. taeniopygus and 53. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 1.0 mm.

FIGURES 91–96. Male genitalia, median lobe, group dispar: 91. Amblycerus crassipunctatus, 92. A. dispar, 93. A. insuturatus, 94. A. schwarzi, 95. A. taeniopygus and 96. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 0.25 mm and 500 ʯm.

FIGURES 97–102. Male genitalia, tegmen, group dispar: 97. Amblycerus crassipunctatus, 98. A. dispar, 99. A. insuturatus, 100. A. schwarzi, 101. A. taeniopygus and 102. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 0.25 mm.

FIGURES 78–83. Pygidium, group dispar: 78. Amblycerus crassipunctatus, 79. A. dispar, 80. A. insuturatus, 81. A. schwarzi, 82. A. taeniopygus and 83. Amblycerus goianiensis Santos & Ribeiro-Costa, sp. n. Scale bars = 1.0 mm.

FIGURES 117–118. FIGURE 117. Map with the geographical distribution of A. crassipunctatus and A. dispar. Leaked symbols refer to bibliography data. FIGURE 118. Map with the geographical distribution of A. insuturatus and A. schwarzi. Leaked symbols refer to bibliography data.