taxonID	type	description	language	source
E932F33BBA9D5478B9AC19CE62D3923D.taxon	description	Fig. 4 A – G, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
E932F33BBA9D5478B9AC19CE62D3923D.taxon	diagnosis	Diagnosis. This species can be separated from the others by the internal sac of male genitalia with a single, gently curved on both sides and acute at each apex (Fig. 4 F). It can never be confused with A. falcorostrus Ribeiro-Costa & Morse, sp. nov. if comparing this sclerite at AR because of the curvature at apex: in A. biacutus Ribeiro-Costa, sp. nov., it is gently curved; in A. falcorostrus Ribeiro-Costa & Morse, sp. nov. it is strongly curved. Besides, differences can be found in the length at the apex and form of the wishbone-shaped sclerite at RM: in A. biacutus Ribeiro-Costa, sp. nov., it is short and the apex smooth; in A. falcorostrus Ribeiro-Costa & Morse, sp. nov. it is long and the apex serrated (Fig. 3 F).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
E932F33BBA9D5478B9AC19CE62D3923D.taxon	description	Description. The description of A. biacutus Ribeiro-Costa, sp. nov. is similar to A. truncatus Ribeiro-Costa, sp. nov. except in the following characters. Dimensions: BL: 6.70 mm, BW: 4.00 mm (n = 1). Integument color: Similar to paler specimens of A. truncatus Ribeiro-Costa, sp. nov., except all antennomeres dark brown. Vestiture: Ventral region with whitish pubescence except abdominal ventrites with yellowish pubescence. Head: Frontal carina faint basally. Ocular index 3.94; ocular sinus 0.2 of the eye length in lateral view. Prothorax: Pronotum with carina bordering the basal lobe. Mesothorax and metathorax: Scutellum ~ 1.5 longer than wide with tridentate apex, all teeth the same size. Elytron 2.85 × longer than wide. Metanepisternal sulcus forming right to gentle obtuse angle, vertical axis reaching the margin of metepisternum. Metaventrite with median sulcus extending> 1 / 2 of its length. Hind femur ~ 2.45 × longer than wide. Hind tibia, lateral spur ~ 2 × length of median spur. First tarsomere ~ 1.38 × the length of lateral spur and 2.76 × the length of median spur. Abdomen: Pygidium with truncate apex in male, female unknown. Last ventrite almost the same length as ventrite IV, apex truncate in males, females unknown. Male terminalia. Tergite VIII gently emarginate at apex. Median lobe ~ 4.20 × its widest at apical region; dorsal valve 0.75 × wider than long, lateral margins straight, apex subtruncate; ventral valve 1.18 × wider than long. Armature of internal sac, AR with a single, gently curved sclerite on both sides and, acute at each apex. MR with a pair of winding, laminar sclerites, outer margin serrate along its middle apical 0.5 of length; wishbone-shaped sclerite 0.63 as long as the laminar sclerites length, straight, apex gently curved and smooth in lateral view. Tegmen with lateral lobes cleft to 1 / 11 of their length.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
E932F33BBA9D5478B9AC19CE62D3923D.taxon	etymology	Etymology. The specific name, an adjective in the nominative case, is Latin for “ twice acute ”. It refers to the apex of the AR sclerite in the internal sac of male genitalia.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
E932F33BBA9D5478B9AC19CE62D3923D.taxon	distribution	Distribution. Brazil (Amazonas-Manaus).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
2D63938208B65BB08A8C012A0708F8B0.taxon	description	Fig. 11 A – H, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
2D63938208B65BB08A8C012A0708F8B0.taxon	diagnosis	Diagnosis. Amblycerus bicolor can be distinguished by the species of the sclerolobii group and the other Amblycerus species by the scutellum with subacute apex (Fig. 11 C), pronotum with elongate coarse punctures on lateral areas (Fig. 11 B), prosternal process very narrow, laminar; elytra and pygidium with coarse punctures at apex and the color pattern of integument on the pygidium with two darker oval areas (Fig. 11 F). It is worth noting that in the male genitalia the two unpaired sclerites at MR differ, one anterior with denticles and the posterior is long, entire, not wishbone-shaped with separate stems (Fig. 11 G).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
2D63938208B65BB08A8C012A0708F8B0.taxon	distribution	Distribution. Brazil (Para), Suriname, French Guiana.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
6DD3AA83690C52D792A470FD203A9B15.taxon	description	Fig. 3 A – G, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
6DD3AA83690C52D792A470FD203A9B15.taxon	diagnosis	Diagnosis. The main character to distinguish A. falcorostrus Ribeiro-Costa & Morse, sp. nov. from others in the group is the presence in the internal sac of male genitalia of a single, strongly curved tooth-shaped sclerite on both sides at AR (Fig. 3 F).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
6DD3AA83690C52D792A470FD203A9B15.taxon	description	Description. The description of A. falcorostrus Ribeiro-Costa & Morse, sp. nov. is similar to A. truncatus Ribeiro-Costa, sp. nov. except by the following characters. Dimensions: BL: 6.60 mm, BW: 3.80 mm (n = 1). Integument color: Dark brown in following areas: vertex, apex of clypeus, labrum, pronotum, elytra, pygidium, abdominal ventrites, first femur and middle leg. Black on part of head, antennomeres, metanepisternum, metasternum, and hind leg. Vestiture: Ventral region with whitish pubescence except abdominal ventrites with yellowish pubescence. Head: Frontal carina absent, finely punctate or smooth on midline. Ocular index: 5.3; ocular sinus 0.05 of the eye length in lateral view. Prothorax: Pronotum with carinae bordering the basal lobe and laterally. Mesothorax and metathorax: Scutellum about as long as wide with tridentate apex, all teeth the same size. Elytron 1.4 × longer than wide. Metanepisteral sulcus with the vertical axis reaching the margin of metepisternum. Metaventrite with median sulcus extending laterally more than a half of its length. Hind femur ~ 2.72 × longer than wide. Hind tibia lateral spur ~ 2 × the length of median spur. First tarsomere ~ 1.38 × the length of lateral spur and 2.61 × the length of median spur. Abdomen: Pygidium rounded at apex in male, female unknown. Last ventrite almost the same length as ventrite IV, male apex not visible. Male terminalia: Tergite 8 gently emarginate at apex. Median lobe ~ 5.34 × its widest at apical region; dorsal valve 0.88 × wider than long; ventral valve 1.28 × wider than long. Armature of internal sac, AR with one strongly curved tooth-shaped sclerite in both sides. MR with a pair of winding, laminar sclerites, outer margin serrate along its middle apical 0.7 length; wishbone-shaped sclerite 0.63 as long as the laminar sclerites length, straight, apex enlarged, subtruncate and serrate in lateral view. Tegmen with lateral lobes cleft 1 / 16 of their length.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
6DD3AA83690C52D792A470FD203A9B15.taxon	etymology	Etymology. The specific name is a new Latin adjective in the nominative case meaning “ with a falcon-like beak ”. It refers to the form of the AR sclerite in the internal sac of the male genitalia.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
6DD3AA83690C52D792A470FD203A9B15.taxon	distribution	Distribution. Brazil (Amazonas-Manaus).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
C0A4496D9EDB56F8A1174A1D23285D6D.taxon	description	Fig. 7 A – H, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
C0A4496D9EDB56F8A1174A1D23285D6D.taxon	diagnosis	Diagnosis. This species is easily recognized by the unique small pair of spine-shaped sclerite at AR of the internal sac of the male (Fig. 7 G). The other species in the sclerolobii group have large sclerites with different forms.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
C0A4496D9EDB56F8A1174A1D23285D6D.taxon	distribution	Distribution. Brazil (Amazonas-Manaus, Rio Tarumã Mirim).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
B11C780E9F2E59E3BECBD1471E000272.taxon	description	Fig. 9 A – G, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
B11C780E9F2E59E3BECBD1471E000272.taxon	diagnosis	Diagnosis. One of the easiest species to identify in the group sclerolobii is Amblycerus manauara. It has the most conspicuous character in the male genitalia, the two pairs of sclerites at the AR in the male genitalia (Fig. 9 F) which separates this species from the others that have one pair (A. kingsolveri, A. marinonii, A. sclerolobii, A. tachigaliae; Figs 7 G, 8 F, 6 H, 10 G) or just a single sclerite (A. truncatus Ribeiro-Costa, sp. nov., A. falcorostrus Ribeiro-Costa & Morse, sp. nov., A. biacutus Ribeiro-Costa, sp. nov. and A. morsei Ribeiro-Costa, sp. nov.; Figs 2 A, 3 F, 4 F, 5 G).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
B11C780E9F2E59E3BECBD1471E000272.taxon	distribution	Distribution. Brazil (Amazonas-Manaus).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
787A4E5363E556C98E2843CC413D98DD.taxon	description	Fig. 8 A – G, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
787A4E5363E556C98E2843CC413D98DD.taxon	diagnosis	Diagnosis. Amblycerus marinonii can be distinguished mainly by the presence in the internal sac of male genitalia at AR of one pair of tooth-shaped, large and strongly curved sclerite (Fig. 8 F). Although A. marinonii shares one pair of sclerite with A. sclerolobii (Fig. 6 H), A. tachigaliae (Fig. 10 G), A. marinonii (Fig. 8 F) and A. kingsolveri (Fig. 7 G) it can be separated by the conspicuous form of the AR sclerites.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
787A4E5363E556C98E2843CC413D98DD.taxon	distribution	Distribution. Brazil (Mato Grosso-Cuiabá, Goiás-Dianópolis, Barro Alto *).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
FF8B1728FE5A5B7DAEA2B755A5FAE490.taxon	description	Fig. 5 A – H, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
FF8B1728FE5A5B7DAEA2B755A5FAE490.taxon	diagnosis	Diagnosis. The main character to distinguish Amblycerus morsei Ribeiro-Costa, sp. nov. from others of the group is the unique strongly curved tooth-shaped sclerite at AR (Fig. 5 G). Amblycerus falcorostrus Ribeiro-Costa & Morse, sp. nov. and A. biacutus Ribeiro-Costa, sp. nov. share a unique sclerite at AR but their sclerites have projections for both sides (Figs 3 F, 4 F). However, in A. kingsolveri, A. marinonii, A. sclerolobii, and A. tachigaliae have one pair of sclerites (Figs 6 H, 7 G, 8 F, 10 G) and A. manauara has two pairs (Fig. 9 F).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
FF8B1728FE5A5B7DAEA2B755A5FAE490.taxon	description	Description. The description of A. morsei Ribeiro-Costa, sp. nov. is similar to A. truncatus Ribeiro-Costa, sp. nov. except by the following characters. Dimensions: BL: 5.50 – 6.50 mm (x ̄ = 5.89 mm; n = 10); BW: 3.30 – 3.70 mm (x ̄ = 3.49 mm; n = 10). Integument color: Similar to color variations in A. truncatus Ribeiro-Costa, sp. nov., some specimens darker or paler but in general keeping the contrast of colors. Antenna with the first two antennomeres reddish brown, the rest dark brown; sometimes entirely dark brown. Vestiture: Dorsum covered with yellowish pubescence evenly distributed, sometimes near elytral suture with whitish setae. Ventral region with whitish pubescence except abdominal ventrites with yellowish pubescence. Head: Frontal carina absent, finely punctate or sometimes less punctate on midline. Ocular index 4.54; ocular sinus 0.02 of the eye length in lateral view; postocular lobe 0.03 of the eye length. Prothorax: Pronotum with carina bordering the basal lobe and toward part of laterals; lateral carina ⅔ the length of pronotum. Mesothorax and metathorax: Scutellum ~ 1.5 × longer than wide with tridentate apex, all teeth the same size. Elytron 1.43 × longer than wide, subtruncate apically. Metanepisternal sulcus with the vertical axis reaching the margin of metepisternum, longitudinal axis ~ less or half the length of metepisternum. Hind femur ~ 2.76 × longer than wide. Hind tibia, lateral spur ~ 1.86 × the length of median spur. First tarsomere ~ 1.58 × the length of lateral spur and 2.93 × the length of median spur. Pygidium 1 / 3 or 1 / 2 covered by the elytra. Abdomen: Pygidium at apex truncate in males, emarginate in females. Last ventrite longer than ventrite IV, apex without differences between sexes. Male genitalia: Median lobe ~ 3.60 × its widest at apical region; dorsal valve 1.30 × wider than long, subtriangular, lateral margins almost straight, apex rounded ventral valve 1.3 × wider than long, lateral margins almost straight, apex acute; dorsal valve 0.73 × wider than long, subtriangular, lateral margins curved; ventral valve 1.59 × wider than long. Armature of internal sac, AR with one strongly curved tooth-shaped sclerite. MR with a pair of winding, laminar sclerites, outer margin serrate along its middle apical 1 / 2 length; wishbone-shaped sclerite 0.49 × as long as the laminar sclerites length, straight, apex enlarged and serrated in lateral view. Tegmen with lateral lobes cleft to 1 / 19 of their length.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
FF8B1728FE5A5B7DAEA2B755A5FAE490.taxon	etymology	Etymology. The specific name is named in honor of Geoffrey E. Morse for his enthusiasm, dedication, and competence to the study of seed beetles.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
FF8B1728FE5A5B7DAEA2B755A5FAE490.taxon	distribution	Distribution. Brazil (Amazonas-Manaus).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
8B57DDB74C4D5EB79ABC6F57DCB62B0C.taxon	description	Fig. 6 A – I, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
8B57DDB74C4D5EB79ABC6F57DCB62B0C.taxon	diagnosis	Diagnosis. Amblycerus sclerolobii differs from the others of the group by the armature of the internal sac of male genitalia. The AR has one pair of sclerites (Fig. 6 H) (A. truncatus Ribeiro-Costa, sp. nov., A. falcorostrus Ribeiro-Costa & Morse, sp. nov., A. biacutus Ribeiro-Costa, sp. nov., A. morsei Ribeiro-Costa, sp. nov. has one sclerite- Figs 2, 3 F, 4 F, 5 G; A. manauara has two pairs- Fig. 9 F), but A. marinonii, A. kingsolveri and A. tachigaliae share with A. sclerolobii one pair (Figs 7 G, 8 F, 10 G). Although A. sclerolobii can be easily separated from these last three species by the serrate winding laminar sclerites at MR (Fig. 6 H) (A. kingsolveri, A. marinonii, A. tachigaliae have straight laminar sclerites: Figs 7 G, 8 F, 10 G).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
8B57DDB74C4D5EB79ABC6F57DCB62B0C.taxon	distribution	Distribution. Brazil (Amazonas-Estirão do Equador, Minas Gerais-Viçosa).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
B59D5F85E1895FF098C1AD387EDB83D2.taxon	description	Fig. 10 A – H, Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
B59D5F85E1895FF098C1AD387EDB83D2.taxon	diagnosis	Diagnosis. Amblycerus tachigaliae has a number of sclerites in the internal sac of male genitalia that distinguish it from the other species of the group sclerolobii (Fig. 10 G). It has an extra pair of sclerites at MR, short and denticulate, in addition to the pair of laminar sclerites and unpaired wishbone-shaped sclerites shared by the other species of the group.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
B59D5F85E1895FF098C1AD387EDB83D2.taxon	distribution	Distribution. Panama (Barro Colorado Island, Colón *), Brazil (Amazonas-Manaus *)	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
1E5DF499BB5C50568285F989AEB90B32.taxon	description	Figs 1 A – H, 2 A, B; Table 1	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
1E5DF499BB5C50568285F989AEB90B32.taxon	diagnosis	Diagnosis. Amblycerus truncatus Ribeiro-Costa, sp. nov. is the unique species in the group sclerolobii with truncate scutellum at apex (Fig. 1 B) and can easily be identified by this character; the other species in the group have scutellum tridentate, with all teeth the same size. The internal characters of male genitalia also distinguish this species, mainly the unique sclerite at AR of internal sac U-shaped inverted with the stems further apart or only the transverse part of the U (Fig. 2 A).	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
1E5DF499BB5C50568285F989AEB90B32.taxon	description	Description. Dimensions: BL: 7.50 – 8.10 mm (x ̄ = 7.86 mm; n = 6); BW: 4.70 – 5.00 mm (x ̄ = 4.92 mm; n = 6) Integument color: Reddish brown in following areas: first two antennomeres, apex of clypeus, labrum, pronotum, elytra, pygidium, metanepisternum, abdominal ventrites on lateral areas and first, middle legs and hind coxae. Dark brown: part of head, antennomeres except first two, thorax ventrites, abdominal ventrites on middle region and hind leg except coxae. Sometimes specimens entirely darker or paler but in general keep the contrast of colors, at least on antennomeres. Vestiture: Dorsum covered with yellowish pubescence evenly distributed, sometimes whitish on darker integument; pygidium sometimes with faint dense median line of setae. Head: Covered with fine and dense punctures, except clypeus at apex and middle to apex of labrum; punctures gently finer on vertex and coarser on clypeus. Frons convex, frontal carina absent, finely punctate or smooth line on midline, sometimes evanescent basally. Eye coarsely faceted, strongly prominent laterally. Ocular index 4.2; ocular sinus 0.1 of the eye length in lateral view; postocular lobe 0.2 the eye length. Antennae with antennomeres elongate except 2 ~ 1 / 3 the length of 1, moderately serrate from antennomeres 4 – 10; 11 elongate-acuminate. Frontoclypeal suture conspicuous. Prothorax: Pronotum semicircular, disk moderately convex, with lateral margins moderately arcuate in dorsal view, median basal lobe delimited, not carinate; cervical sulcus on 1 / 3 lateral reaching cervical boss with trichobothria; disc with fine and dense punctures, moderately coarse punctures on lateral areas; lateral carina almost reaching the anterior margin of pronotum. Prosternal process narrow, apex slightly expanded and gently beyond anterior coxae. Mesothorax and metathorax: Scutellum 1.3 longer than wide with truncate apex. Elytron 2.6 × longer than wide; striae composed of fine punctures joined in lines; all free apically except third and eighth joined; strial intervals only with fine punctures, somewhat flat medially, truncate apically. Mesoventrite truncate apically. Metanepisternum with only fine punctures, lacking striate file; metepisternal sulcus forming right angle, vertical axis not reaching the margin of metepisternum, longitudinal axis less than a half the length of metepisternum. Metaventrite with dense and fine punctures, without coarse punctures, not protuberant between mid coxae, median sulcus extending laterally a half or more than a half the length of metaventrite. Hind coxae with fine dense punctures; moderately coarse, sparse punctures on distal two-thirds. Hind femur slender, ~ 2.82 × longer than wide. Hind tibia with coronal denticles of about equal length; lateral spur ~ 2.36 × the length of median spur. First tarsomere ~ 1.20 the length of lateral spur and 2.84 × the length of median spur. Abdomen: Pygidium basal 1 / 3 covered by the elytra, with moderately coarse and dense punctures, apex subtruncate in males and subacute in females. Ventrites with moderately coarse, sparse punctures on lateral areas, last ventrite longer than ventrive IV, gently emarginate in male, rounded in female. Male terminalia: Tergite VIII subsquare, subtruncate at apex. Median lobe ~ 3.95 × its widest at apical region; dorsal valve 0.73 × wider than long, subtriangular, lateral margins gently curved, apex rounded; ventral valve 1.59 × wider than long, lateral margins emarginate, apex acute. Armature of internal sac, AR with one sclerite U- shaped inverted with the stems further apart or only the transverse part of the U. MR with a pair of long, laminar, straight sclerites, outer margin serrate along its middle apical 0.5 length; wishbone-shaped sclerite 0.42 as long as the laminar sclerites length, gently curved, apex projected, subtruncate in lateral view or wishbone-shaped sclerite with similar form, less than half its length. BR with one sclerite with long stems gradually approximates. Tegmen with lateral lobes cleft to 1 / 12 of their length, strongly expanded laterally.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
1E5DF499BB5C50568285F989AEB90B32.taxon	etymology	Etymology. The specific name, an adjective in the nominative case, is Latin for truncate in reference to the shape of the scutellum of this species.	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
1E5DF499BB5C50568285F989AEB90B32.taxon	distribution	Distribution. Brazil (Mato Grosso-Sinop)	en	Ribeiro-Costa, Cibele Stramare, Morse, Geoffrey E. (2025): Circumscription of the sclerolobii group of Amblycerus Thunberg (Coleoptera, Chrysomelidae, Bruchinae) with descriptions of four new species and a revision of the species groups of the genus. ZooKeys 1252: 35-67, DOI: 10.3897/zookeys.1252.144951
