Alienosternus sanjacintero García, Botero, and Martínez, 2020

García, Kimberly, Botero, Juan Pablo & Martínez, Neis José, 2020, New species and new geographical records in South American Piezocerini (Coleoptera: Cerambycidae) with revised keys to species of Alienosternus and Hemilissa, The Canadian Entomologist 152 (1), pp. 18-35 : 20-22

Alienosternus sanjacintero García, Botero, and Martínez , new species

http://zoobank.org/ urn:lsid:zoobank.org:act:0C37E5B5-B22A-4D7A-B43A-F59E092AC943 .

Figures 1–4 .

Type material

Holotype female. COLOMBIA, Bolívar : San Jacinto (Reserva La Flecha, 324 m, 09°51 0 12.4 00 'N, 75°10 0 41.4 00 W), 15–16.iv.2018, K. García, “Trampa de luz blanca,” MPUJ _ ENT 0064075 ( MPUJ) . Paratype. COLOMBIA, Bolívar : San Jacinto (Reserva La Flecha, 324 m, 09°51 0 12.4 00 N, 75°10 0 41.4 00 W), one female ; 15–16.iv.2018, K. García, “Trampa de luz blanca” ( UARC) .

Diagnosis

The species is distinguished from other species in the genus by having light brown integument; lateral carina on elytra, from humerus to posterior fifth; elytral apex emarginate, with spine on outer angle, and rounded on sutural angle.

Description

Female. Integument mostly light brown. Head dorsally, pronotum, scape, pedicel and basal antennomeres darker, ventrites lighter.

Head. Dorsally entirely reticulate; with short, sparse setae. Frons with moderately long, sparse setae. Central area between antennal tubercles with longitudinal sulcus between antennal tubercle and median groove. Antennal tubercles projected, rounded at apex. Median groove distinct from near clypeus to posterior level of antennal tubercles. Gulamentum smooth. Mandibles with long, sparse setae on outer surface. Distance between upper eye lobes three times width of an upper eye lobe. Antennae ending at apical fourth of elytra. Scape coarsely reticulate; with moderately long, sparse setae. Antennal formula (ratio) based on length of antennomere III: scape = 0.77; pedicel = 0.15; IV = 0.96; V = 0.96; VI = 0.77; VII = 0.77; VIII = 0.58; IX = 0.58; X = 0.46; XI = 0.69.

Thorax. Prothorax subquadrate; basal quarter deeply constricted; sides rounded. Pronotum coarsely alveolate; with long, thick, sparse setae throughout, with short, sparse setae interspersed; posterior region depressed. Sides of prothorax with sculpture and setae as on pronotum. Prosternum microsculptured; with long, sparse setae, with minute setae interspersed. Prosternal process with sides subparallel, slightly narrowed at middle, slightly expanded at apex, posterior margin emarginate, transversely sulcate and flat at apex; width at narrowest point about 1/4 of procoxal cavity width. Mesoventrite tumid, microsculptured, with moderately long, sparse setae, especially centrally. Mesoventral process, at narrowest point, about half of mesocoxal cavity width, sides convergent towards apex, deeply emarginate at apex. Metenepisternum with short, abundant setae. Metaventrite glabrous and smooth centrally, anterior half densely microsculptured laterally, with long, sparse setae (more so laterally) in anterior half and along posterior margin. Scutellum glabrous, posterior margin widely rounded. Elytra coarsely, deeply, abundantly punctate on basal half, gradually finely and shallowly punctate towards apex; with long, sparse setae throughout; with lateral carina, from humerus to posterior fifth; apex emarginate, with outer angle spiniform, rounded at sutural angle. Legs with long sparse setae; femoral peduncle longitudinally sulcate ventrally and dorsally. Tibiae distinctly carinate.

Abdomen. Ventrites slightly microsculptured, with sparse, long, and short setae; ventrite I slightly shorter than II–III together; apex of ventrite V subtruncate.

Measurements. Holotype, female, total length: 7.4 mm, prothorax length: 1.5 mm, prothorax width at widest point: 1.5 mm, elytral length: 5.2 mm, humeral width: 1.7 mm. Paratype, female, total length: 7.4 mm, prothorax length: 1.5 mm, prothorax width at widest point: 1.5 mm, elytral length: 5.1 mm, humeral width: 1.8 mm.

Etymology

The epithet, sanjacintero , is a demonym alluding to the inhabitants of the municipality of San Jacinto, in Colombia, the locality where the specimen was collected. The name should be treated as a noun in apposition.

Remarks

Alienosternus sanjacintero differs from A. metallicus Martins, 1976 by its general light brown colour (head and prothorax reddish orange, elytra green, and antennae and legs brown in A. metallicus ). It differs from A. solitarius (Gounelle, 1909) by the elytra with lateral carina, from humerus to posterior fifth, and elytral apex emarginate, with outer angle spinose and sutural angle rounded (the elytra lack lateral carina and the elytral apex is unarmed and truncate in A. solitarius ). The new species differs from A. simplex Martins, 1976 by the prosternal process not laminiform (width at narrowest point about 1/4 of procoxal cavity width), and elytral apex emarginate and with outer angle spinose (the prosternal process is laminiform and the elytral apex is truncate and unarmed in A. simplex ). Finally, Alienosternus sanjacintero differs from A. cristatus (Zajciw, 1970) by the elytral carina distinct from humerus to posterior fifth; the mesoventral process, at narrowest point, about half of mesocoxal cavity width; and the elytral apex with outer angle armed (the lateral elytral carina is shorter, from humerus to anterior third; mesoventral process is wider than mesocoxal cavity width; and the elytral apex is unarmed in A. cristatus ). According to Tavakilian and Chevillotte (2019), Alienosternus is known from Brazil and Argentina; therefore, we first record this genus in Colombia.

Figures

Figs. 1–8. 1–4, Alienosternus sanjacintero new species, holotype, female: 1, dorsal view; 2, ventral view; 3, lateral view; 4, details of head, frontal view. 5–8, Alienosternus wappesi new species, holotype, female: 5, details of head, frontal view; 6, dorsal view; 7, ventral view; 8, lateral view.