Oxycoleus schusteri, Pérez-Flores & Santos-Silva, 2022

Pérez-Flores, Oscar & Santos-Silva, Antonio, 2022, New species of Cerambycinae (Coleoptera, Cerambycidae) from Guatemala, Papéis Avulsos de Zoologia 62, pp. 1-7 : 3-5

Oxycoleus schusteri sp. nov.

( Fig. 2 ) http://zoobank.org/ F5E668FA-3262-4D26-8C91-2BDFBF0440B1

Description: Holotype Male: Integument mostly black; ventral mouthparts orangish yellow, except brown distal segments of palpomeres; anteclypeus and labrum orangish brown. Posterior half of area behind eyes, posterior ⅔ of gulamentum, prothorax, and ventral surface of mesothorax bright orange, slightly yellowish on base of pronotum. Metaventrite with irregular dark brown areas interspersed. Elytra orangish brown, except brown anterior third laterally. Pro- and mesocoxae orange; trochanters and metacoxae reddish brown.

Head: Frons narrow, transverse, densely microscopically punctate, with fine, sparse punctures interspersed; with minute orangish-brown pubescence not obscuring integument, and orangish-brown long, erect setae laterally. Median groove deep, somewhat wide from clypeus to area between antennal tubercles. Vertex and area between antennal tubercles and upper eye lobes with coarse, shallow, sparse punctures, punctures sparser close to prothorax; with minute orangish-brown pubescence not obscuring integument, light orange pubescence on orange area; with long, erect, scattered orangish-brown setae; with longitudinal gibbosity on median groove, from frons to orange area. Area behind lower eye lobes transversely striate, except smooth inferior area; striate area with short, orangish-brown setae; smooth area almost glabrous. Genae with transverse row of minute punctures near eye, smooth on remaining surface; with minute, decumbent bright orange setae on punctate area, glabrous on remaining surface. Central area of postclypeus microscopically punctate, except coarsely, sparsely punctures close to anteclypeus; with minute orangish-brown pubescence. Sides of postclypeus smooth and glabrous. Labrum with short, somewhat abundant yellowish-brown setae and long, erect setae of same color interspersed posteriorly. Gulamentum smooth, glabrous on posterior ⅔; anterior third finely punctate-striate centrally, sculpturing coarser laterally; with short, erect yellowish-brown setae, almost absent centrally. Distance between upper eye lobes 0.75 times length of scape; in frontal view, distance between lower eye lobes 1.11 times length of scape. Antennae (from base of scape to apex of antennomere IX; missing antennomeres X and XI) 1.6 times elytral length, reaching elytral apex about apex of antennomere VIII. Scape clavate; finely, densely punctate; with long, erect dark brow setae; setae sparser on ventral surface. Pedicel and antennomeres III-IX with minute orangish-brown pubescence, and long, erect dark brown setae on pedicel and antennomeres III-V ventrally. Antennomeres III-IV cylindrical. Antennomere V-IX gradually widened toward area near apex on its outer surface. Antennal formula (ratio) based on length of antennomere III: scape = 1.20; pedicel = 0.17; IV = 1.41; V = 1.48; VI = 1.53; VII = 1.46; VIII = 1.36; IX = 1.33.

Thorax: Prothorax wider than long; sides rounded between anterolateral angles and anterior constriction, with distinct obtuse projection centrally, then slightly divergent toward posterolateral angles. Pronotum tumid between anterior margin and sulcus of anterior constriction; anterocentral area with distinct longitudinal gibbosity; with narrow, transverse, somewhat arched sulcus on each side of apex of anterior fifth; with large, slightly elevated gibbosity on each side between anterior and posterior constrictions,more elevated on its posterior half;with slightly elevated gibbosity centrally, from near middle to posterior constriction; lateral gibbosities surrounded internally and posteriorly with narrow semicircular sulcus; with coarse, shallow sparse punctures, denser and finer on gibbosities; with minute, dense bright orange pubescence not obscuring integument, somewhat darker on lateral gibbosities; apex of antero- and posterocentral gibbosities glabrous; with long, erect, scattered orangish setae. Sides of prothorax with sculpturing and pubescence as on pronotum. Prosternum finely, transversely striate; with short, erect orangish-yellow setae centrally close to coxal cavities and laterally, absent on remaining surface. Prosternal process very narrow on anterior half, strongly widened posteriorly, with apex truncate; with short, erect bright orange setae. Mesoventrite with short, erect orangish-yellow pubescence, not obscuring integument; mesanepisternum and mesepimeron with dense, minute bright orange pubescence not obscuring integument. Metanepisternum and sides of metaventrite with sparse orangish-brown pubescence not obscuring integument, and long, erect orangish-yellow setae interspersed, almost glabrous on central area of metaventrite. Scutellum glabrous, except narrow fringe of short orangish-yellow setae along margins. Elytra: Reaching about apex of abdominal segment II; slightly narrowed toward apex, distinctly dehiscent internally from anterior third; lateral carina well-marked, especially from anterior third; coarsely and abundantly punctate; with orangish-brown pubescence not obscuring integument; with a few short, erect orangish-yellow setae; apex rounded. Legs: Coxae and trochanters with short, sparse orangish-yellow setae. Profemora fusiform, meso- and metafemora pedunculate; with short, erect, somewhat orangish-brown setae; with long, erect, sparse brown setae. Tibiae with short, erect orangish-brown setae, and long, erect brown setae interspersed, erect setae distinctly denser dorsally and ventrally. Metatarsomere I longer than II-III together.

Abdomen: Finely, sparsely punctate. Basal third of ventrite 1 and 2 with short, erect, abundant yellowish-white setae, with long, erect, sparse orangish-brown setae on remaining surface; ventrites 3-5, with long, erect, sparse orangish-brown setae, slightly denser laterally. Distal margin of 5 widely concave.Apex of 6 widely emarginate.

Dimensions (mm): Holotype male: Total length, 8.20; prothoracic length, 1.15;anterior prothoracic width, 1.00; posterior prothoracic width, 1.15; maximum prothoracic width, 1.55; humeral width, 1.80; elytral length, 4.00.

Type material: Holotype male labeled: “ GUATEMALA, Izabal, Sureste de Morales, Sierra de Caral. Finca Firmeza , 8/II/2000, 1150m. J. Monzon ”. ( UVGC).

Etymology: This species is named after Jack Schuster (Universidad del Valle de Guatemala), a prominent entomologist interested in the study of the diversity and conservation of Guatemala, and author of several publications on the family Passalidae .

Remarks: Oxycoleus schusteri sp. nov. differs from congeners by the metafemora distinctly not abruptly clavate, instead pedunculate. Oxycoleus schusteri sp. nov. is similar to O. brasiliensis (Tippmann, 1953) O. laetus Julio, 1997 , and O. ruficollis (Zajciw, 1964) (see photographs on Bezark, 2022b), but differs as follows: elytra narrower toward apex (almost subparallel in O. brasiliensis , O. laetus and O. ruficollis ), metafemoral peduncle proportionally slender and longer (metafemoral club abruptly widened in O. brasiliensis , O. laetus and O. ruficollis ).

Oxycoleus schusteri sp. nov. resembles Callimoxys species (Stenopterini), but in this species, males have five abdominal ventrites, whereas in Oxycoleus schusteri sp. nov. there are six.

Figures

Figure 2. Oxycoleus schusteri sp.nov., holotype male:(A) Dorsal habitus;(B)Ventral habitus;(C) Lateral habitus;(D) Head,frontal view.