Amblycerus eustrophoides ( Schaeffer, 1904 )

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 : 139-140

Amblycerus eustrophoides ( Schaeffer, 1904)

( Figs 19 , 32 , 45 , 58 , 75, 88, 111, 114, 122)

Spermophagus eustrophoides Schaeffer, 1904: 228 (desc., type, distr.,); Pic, 1913: 59 (cat.); Leng, 1920: 306 (cat.); Johnson, 1968: 1268 (type).

Amblycerus eustrophoides Johnson, 1968: 1268 (type); Bottimer, 1968: 102, 1038 (new comb.); Kingsolver, 1970: 473–474 (distr., host, key, redesc.); Johnson & Kingsolver, 1981: 410 (check.); Udayagiri & Wadhi, 1989: 9 (cat., distr., host.); Kingsolver et al. 1993: 122 (distr., host, redesc.); Romero et al. 1996: 48, 49, 140 (distr., host., key); Romero et al. 2002 (phyl.).

Type material. The species recognition was done through the original description and illustration of the male genitalia ( Romero et al. 1996).

Additional specimens examined. [1 female specimen]: Paradise\ Key Fla\ Mar 2. 19; H Barber.\ Collector; Spermophagus \ eustrophoides\ H. B 1920 (?) Schaeffer [label handwriting]; Amblycerus eustrophoides \ ( Schaeffer, 1904)\ Det.: A. T. Santos; C. S. Ribeiro-Costa, 2018. ( USNM). [1 male specimen]: Ac. 5409\ Coll Chas Palm; Kissimmee.\ Fla.; Spermo\ phagus [label handwriting]; Amblycerus \ eustrophoides\ Bott.’60 (Schfr.); Amblycerus eus- trophoides \ ( Schaeffer, 1904)\ Det.:A. T. Santos; C. S. Ribeiro-Costa, 2018. ( AMNH). [1 male specimen]: MEXICO Tamps.\ Hda. Santa Engracia\ May—June 1936\ M. McPhail; reared from\ “huilotillo”; eustrophoides [handwriting]; Amblycerus eustrophoides \ ( Schaeffer, 1904)\ Det.: A. T. Santos; C. S. Ribeiro-Costa, 2018. ( DZUP).

Measurements. BL: 8.5 mm; BW: 4.6 mm.

Diagnosis ( Figs 19 , 32 , 45 , 58 , 111 ). Amblycerus eustrophoides is characterized by the following combination of characters: eyes distant from each other anteriorly ( Fig. 32 ), ocular index: 3.4; antennomere 7 about 2.2 longer than wide; pronotum subtrapezoidal with lateral margins straight ( Fig. 58 ); metepisternum with longitudinal, fusiform and striated area ( Fig. 45 ); elytra with striae formed by isolated punctures, interestriae 4–5 and 6–7 fusioned apically ( Fig. 19 ); metafemora with tooth on apical margin; median lobe of male genitalia about 4.4 times as long as its greatest width at apical region ( Fig. 111 ); internal sac with a pair of hollow, subcylindrical tuberculate sclerites on the apical region ( Fig. 111 ). Amblycerus eustrophoides is most similar externally to A. ischiodontus Ribeiro-Costa, 1999a , belonging to the ischiodontus group ( Ribeiro-Costa 1995), but it differs from the latter species in having dorsum and ventrites covered with light yellow setae (orange setae in A. ischiodontus ), pronotum entirely covered by coarse and dense punctures (laterally in A. ischiodontus ) and metepisternum with moderate coarse punctures (without moderately coarse punctures in A. ischiodontus ). Other similar species is A. stridulator , belonging to the stridulator group ( Romero et al. 1996); however, A. eustrophoides has metepisternum with longitudinal, fusiform and striated area (with transverse, fusiform, curved and striated area in A. stridulator ), elytra and pygidium without black setae (some black setae in A. stridulator ) and median region of male genitalia with unpaired wishbone sclerite (one pair of thorn-shaped sclerite in A. stridulator ). Amblycerus eustrophoides can be further differentiated from A. pollens , species belonging to the pollens group ( Ribeiro-Costa 1995), because it shows a tooth on metafemora (without tooth in A. pollens ) and apical margin of hind tibia with all denticles of the same size (one denticle longer than the others in A. pollens ).

Distribution ( Fig. 122 ). United States, Mexico, Cuba and Costa Rica.

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

Host Plants (Tab. II). Euphorbiaceae : Drypetes laterifolia (Sw.) Krug & Urb. Salicaceae : Neopringlea sp. (new record).

Figures

FIGURE 122. Map with the geographical distribution of A. eustrophoides, A. serieguttatus and A. simulator. Leaked symbols refer to bibliography data.

FIGURES 19–21. Species reallocated: 19. A. eustrophoides, 20. A. serieguttatus, 21. A. simulator. Scale bars = 1.0 mm.

FIGURES 32–34. Head, species reallocated: 32. A. eustrophoides, 33. A. serieguttatus, 34. A. simulator. Scale bars = 1.0 mm.

FIGURES 45–47. Lateral, species reallocated: 45. A. eustrophoides, 46. A. serieguttatus and 47. A. simulator. Scale bars = 1.0 mm.

FIGURES 58–60. Pronotum, species reallocated: 58. A. eustrophoides. 59. A. serieguttatus and 60. A. simulator. Scale bars = 1.0 mm.

FIGURES 111–113. Male genitalia, species reallocated: 111. A. eustrophoides, 112. A. serieguttatus and 113. A. simulator. Scale bars = 0.25 mm.