Crossomeles oscarcastilloi Nearns & Swift, 2022

Nearns, Eugenio H. & Swift, Ian P., 2022, Descriptions and new records in longhorned beetles (Coleoptera: Cerambycidae) from Central America, Zootaxa 5141 (1), pp. 39-48 : 42-44

Crossomeles oscarcastilloi Nearns & Swift , sp. nov.

( Figures 2a–d , 5d, 5h, 5l )

Description. Male ( Figs. 2a–d , 5d, h, i ). Length 18.0 mm (measured from frons to abdominal apex), width 2.7 mm (measured across humeri). Habitus as in Fig. 2a . Form moderate sized, elongate; integument black with portions dark brown and reddish orange.

Head. Frons black with fine, somewhat abundant yellow pubescence; eyes large, globose, narrowly separated in front by about 5 ommatidia; frons with narrow, moderately deep median suture; genae about 3/4 as tall as lower eye lobe ( Figs. 2c , 5d ); vertex irregularly punctate; antennae extending to near middle of abdominal segment II; antennomeres I–IV black, V–XI dark brown; antennomeres I–VI with several long and erect setae beneath, VI–XI slightly expanded apically; with 2–3 small sensory pores on dorsal and ventral surface of each antennomere. Antennal formula based on length of antennomere III: scape=0.50; II=0.25; III=1.00; IV=0.50; V=0.90; VI=0.85; VII=0.83; VIII=0.70; IX=0.65; X=0.60; XI=0.65.

Thorax. Pronotum black, elongate, subcylindrical, about 1.25 times as long as wide ( Figs. 2a, b , 5h ); disk coarsely, deeply, subconfluently alveolate, pubescence yellow across apex, base, and down sides dense; prosternum clothed with long, suberect setae; mesoventrite densely clothed at sides with fine, golden, appressed pubescence; metaventrite moderately densely punctate, moderately densely clothed with short, golden, appressed pubescence along top margin and on posterior end. Mesanepisternum densely clothed with appressed pale yellow pubescence. Mesepimeron with sparse pale yellow setae. Metanespisternum with sparse pale yellow setae on anterior 3/4, densely clothed with appressed pale yellow pubescence on posterior 1/4. Scutellum densely clothed with appressed pale yellow pubescence. Elytra extending beyond posterior margin of abdominal segment I at about middle of segment II; disk shining, testaceous, base yellowish inside of humeri, humeri black, margins narrowly black; punctures moderately dense, becoming finer toward apex; pubescence sparse, long, erect and suberect, each seta rising out of a puncture; each elytron strongly dehiscent and narrowing from behind middle; apices narrowly rounded, about as wide as length of second antennal segment.

Legs. Pro- and mesofemora reddish orange, pro- and mesotibiae almost black, basal half of metatibiae black; pro- and mesofemora strongly clavate, short; metafemora elongate, widening slightly at apical third ( Fig. 2d ); metatibiae with a large, dense brush of orangish hairs on apical two-thirds ( Fig. 5i ). Metatarsomere I about as long as II–IV combined.

Abdomen. Elongate, slender, broadening slightly toward apex, with portions reddish orange, yellow and black ( Figs. 2a, d ); ventrites progressively more densely punctate from first; pubescence sparse; last ventrite shallowly impressed medially.

Female. Unknown.

Diagnosis and remarks. This species can be separated from congeners by the elytra longer, extending beyond posterior margin of abdominal segment I to about middle of segment II, narrowly rounded apically; integument of basal antennae black; and genae about 3/4 as long as lower lobe of eye.

Type material. Holotype, male ( Figs. 2a–d ): “ Costa Rica: Puntarenas Province, Santa Elena, caught on the wing, 1388 m., 10°19′20″N, 84°49′19″W, 11-VI-2021, O. Castillo coll.” ( MNCR).

Etymology. We are pleased to name this species for our dear friend and master nature guide, Oscar Castillo Mejia (Nasua Tours, Monteverde, Costa Rica), who collected the holotype specimen. The epithet is a noun in the genitive case.

Figures

FIGURE 2. Crossomeles oscarcastilloi sp. nov., holotype male. a) Dorsal habitus. b) Photograph of live holotype. c) Close-up of head. d) Lateral habitus.

FIGURE 5. Four species of Crossomeles. a) C. acutipennis, paratype male, close-up of head. b) C. aureopilis, paratype male, close-up of head. c) C. copei, holotype male, close-up of head. d) C. oscarcastilloi sp. nov., holotype male, close-up of head. e) C. acutipennis, paratype male, close-up of pronotum. f) C. aureopilis, paratype male, close-up of pronotum. g) C. copei, holotype male, close-up of pronotum. h) C. oscarcastilloi sp. nov., holotype male, close-up of pronotum. i) C. acutipennis, paratype male, close-up of metatibia. j) C. aureopilis, paratype male, close-up of metatibia. k) C. copei, holotype male, close-up of metatibia. l) C. oscarcastilloi sp. nov., holotype male, close-up of metatibia.