Amblycerus alternatus ( Pic, 1954 )

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 : 129-130

Amblycerus alternatus ( Pic, 1954)

( Figs 5, 6 , 15 , 28 , 41 , 54 , 71, 84, 103, 107, 120)

Spermophagus alternatus Pic, 1954: 13–16 (desc.).

Amblycerus alternatus: Kingsolver, 1980: 241 (cit.); Romero et al. 1996 (desc., type, distr., key); Romero et al. 2002 (phyl.).

Type material examined. Holotype deposited in MNHN, 1 male, with labels: Alternatus\ nsp [handwritten symbol]; type [handwritten]; HOLOTYPE ♀ [handwritten symbol]\ Spermophagus \ alternatus\ Pic [label with red bor- der]; Amblycerus \ alternatus\ (Pic)\ det. 76\ J. M. Kingsolver; MUSÉUM PARIS \ 1958\ coll. M. PIC; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. Paratype deposited in MNHN, 1 female, with labels: Colombie [handwritten]; PARATYPE [red label written in black]; alternatus\ Pic\ det.\ J. M. Kingsolver; MUSÉUM PARIS \ 1958\ coll. M. PIC; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. Paratype deposited in MNHN, 1 female, with labels: Colombie [handwritten]; PARATYPE [red label written in black]; alternatus\ Pic\ det.\ J. M. Kingsolver; MUSÉUM PARIS \ 1958\ coll. M. PIC; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. Paratype deposited in MNHN, 1 female, with labels: Columb [handwritten]/ Spermophag/ cervinus.\Volg [illegible]; PARATYPE [red label written in black]; alternatus\ Pic\ det.\J. M. Kingsolver; MUSÉUM PARIS \ 1958\ coll. M. PIC; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017.

Additional specimens examined. [1 male specimen]: Ft. Clayton\ Panama C. Z.\ 1 Mar. ‘70\ H. Stockwell\ alternatus; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. ( DZUP). [1 female specimen]: GUATEMALA: Zacapa \ rd. to San Lorenzo\ 1000 m., mv + bl, 15\ Oct. 2006, R. Turnbow; Amblycerus \ alternatus (Pic) \ det.\J. M. Kingsolver; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. ( FSCA). [1 male specimen]: PANAMA: Bayano\ 10.6 km. E Canita\ 29 June 1997 \ R. Turnbow ♀ [handwrit- ten symbol]; Amblycerus \ alternatus (Pic) \ det.\J. M. Kingsolver; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. ( FSCA). [1 male specimen]: Brasil Pará\ São João de Pirabas\ Japerica\ 20 a 22-XII-1992; Armadilha\ Malaise; MPEG 01019977; Amblycerus sp.\ Viana, JH det. 2016; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. ( MPEG). [1 female specimen]: Brasil Pará\ São João de Pirabas\ Japerica\ Ilha Conceição\ 22-XII-1992; Coleoptera: Polyphaga \ Chrysomeliformia:\ Curculionoidea:\ Bruchidae :\ Incorp: 24.v.2002; MPEG 01019977; Amblycerus sp.\ Viana, J. H. det. 2016; Amblycerus alternatus \ ( Pic, 1954)\ Det.: A. T. Santos;\ C. S. Ribeiro-Costa, 2017. ( MPEG).

Measurements. BL: 6.0 mm; BW: 3.5 mm.

Diagnosis ( Figs 28 , 103 ). Amblycerus alternatus is characterized by the following characters combination: eyes distant from each other anteriorly, ocular index: 4.6; elytra with dense stripes of setae more conspicuous on interestriae 3, 5, 7 and 9; internal sac of male genitalia in the apical region with a pair of hollow, subtriangular, tuberculate sclerite ( Fig. 103 ). Amblycerus alternatus differs from A. spondiae by the indistinct frontoclypeal suture (distinct in A. spondiae ), cervical boss with two setae (three setae in A. spondiae ), metaventrite with median sulcus about half as long as metaventrite (longer than a half the lenght of metaventrite in A. spondiae ) male genitalia at apical region with a pair of hollow, subtriangular, tuberculate sclerites (with a pair of hollow, subtriangular not tuberculate sclerites in A. spondiae ). Amblycerus alternatus differs from A. vitis in the apical region of male genitalia, where a pair of subtriangular sclerite is tuberculate in the former species and smooth in the latter, and in the median region, whose unpaired wishbone sclerite is short in A. alternatus whereas it is longer in A. vitis . Amblycerus alternatus differs from A. cuernavacensis by the indistinct frontoclypeal suture (distinct in A. cuernavacensis ), lateral carina almost reaching the posterior margin of pronotum (reaching the posterior margin in A. cuernavacensis ) and scutellum tridentate with median tooth longer than the lateral ones (all teeth with same length in A. cuernavacensis ).

Distribution ( Fig. 120 ). Mexico, Guatemala (new country record), Honduras, Panama, Colombia and Brazil.

Life History. No information was found on this species in the literature.

Host Plants. Unknown.

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 15–18. Dorsal, group spondiae: 15. A. alternatus, 16. A. cuernavacensis, 17. A. spondiae, 18. A. vitis. Scale bars = 1.0 mm.

FIGURES 28–31. Head, group spondiae: 28. A. alternatus, 29. A. cuernavacensis, 30. A. spondiae, 31. A. vitis. Scale bars = 1.0 mm.

FIGURES 41–44. Lateral, group spondiae: 41. A. alternatus, 42. A. cuernavacensis, 43. A. spondiae and 44. A. vitis. Scale bars = 1.0 mm.

FIGURES 54–57. Pronotum, group spondiae: 54. A. alternatus, 55. A. cuernavacensis, 56. A. spondiae and 57. A. vitis. Scale bars = 1.0 mm.

FIGURES 103–106. Male genitalia, median lobe, group spondiae: 103. A. alternatus, 104. A. cuernavacensis, 105. A. spondiae and 106. A. vitis. Scale bars = 0.25 mm.

FIGURES 120–121. FIGURE 120. Map with the geographical distribution of A. alternatus and A. cuernavacensis. Leaked symbols refer to bibliography data. FIGURE 121. Map with the geographical distribution of A. spondiae and A. vitis. Leaked symbols refer to bibliography data.