Acorystus albicornis Scherrer et Santos

Scherrer, Marcus V., Santos, Bernardo F. & Aguiar, Alexandre P., 2010, Generic redefinition, key and two new species of Acorystus To w ne s (Hymenoptera: Ichneumonidae: Cryptinae), Zootaxa 2721, pp. 28-38: 31-32

publication ID

http://doi.org/ 10.5281/zenodo.199900

persistent identifier

http://treatment.plazi.org/id/4340CE70-FFFB-045D-73B2-FD6FFAE6FAB2

treatment provided by

Plazi

scientific name

Acorystus albicornis Scherrer et Santos
status

sp. nov.

Acorystus albicornis Scherrer et Santos  , sp. nov.

( Figs 3 –7View FIGURES 2, 3. 2View FIGURES 4 – 11. 4 – 7, 14View FIGURE 14)

Description. Ψ. Fore wing 5.1–5.8 mm. Head ( Figs 3–5View FIGURES 2, 3. 2View FIGURES 4 – 11. 4 – 7): antenna with 24–25 flagellomeres; clypeus pronounced, rounded, strongly convex, apex slightly concave; as punctate and pilose as remainder of head; CWH 1.62, CWW 1.62; MLW 1.39, MWW 0.61; mandible moderately long, apex thin, ventral margin sharp, expanded into perpendicular flange with 0.3 of mandible apex width, ventral tooth about 0.5 as long as dorsal tooth; supraantennal horn conical, with about 0.5 of pedicel length; supra-antennal area with pair of very weak sublateral longitudinal swelling from horn until ocellar triangle, this swelling irregular, with slight rugulosities; occipital carina meeting hypostomal carina near mandible base, forming a high, sharp flange next to mandible, making a deep rift between gena and occipital carina flange with about the extension of mandible base width; MSM 0.8.

Mesosoma  ( Figs 3View FIGURES 2, 3. 2, 6View FIGURES 4 – 11. 4 – 7): pronotum with high carina bordering collar, posterior margin with weak and short wrinkles, dorsal margin moderately swollen; mesoscutum with sparse, thin, shallow punctures, with lateral flange behind tegula; notaulus strongly impressed; lateral carina of scutellum high, sharp, reaching 0.25 of scutellum; epicnemial carina restricted to ventral 0.5 of mesopleuron, almost straight; mesopleuron anterior margin with short, tick transversal wrinkles; sternaulus moderately impressed at anterior 0.5, with very weak wrinkles at anterior 0.3, posterior 0.5 very shallow; mesopleural suture with strong transversal wrinkles; metapleuron with long hairs, with almost indistinct, rather shallow punctures that are separated by about 5.0x their own diameter; pleural carina very weak, with short transverse wrinkles. Propodeum: limit between anterior margin and transverse furrow at base of propodeum centrally indistinct; spiracle elliptical, SWL 2.00; anterior transverse carina almost straight, area behind it smooth, with almost indistinct, rather shallow punctures that are separated by about 7.0–10.0x their own diameter. Legs: pre-apical tarsomeres bilobed, mesal lobe slightly longer than lateral lobe; FLW 5.94. Wings: fore wing vein 2 + 3 Rs and crossvein 1 m-cu perfectly continuous with each other; vein 1 M+Rs slightly sinuous; crossvein 1 cu-a weakly convex, forming slightly acute angle with M+Cu, basad of 1 M+Rs by about 0.15 its own length; vein 2 -Cu about 0.43 as long as crossvein 2 cu-a; APH 0.37, AWH 1.86; veins 3 -M and 2 -M about same size; hind wing vein Cua forming obtuse angle with vein 1 M; HW 1 C 1.10; vein 1 Rsb with constricted diameter during its apical 0.85; veins 1 Rsa and 1 Rsb almost continuous; vein Cub straight, reaching about 0.8 of distance to wing margin; vein 2 - 1 A reaching about 0.6 of distance to wing margin.

Metasoma ( Figs 3View FIGURES 2, 3. 2, 6, 7View FIGURES 4 – 11. 4 – 7): T 1 LW 4.08, T 1 WW 1.76, spiracle at basal 0.6, not prominent; T 2 LW 1.54, T 2 WW 2.18; thyridium almost circular; OST 0.84; dorsal valve with nodus and notch absent.

Color: Head black; thorax, legs, metasoma yellow. Head: black; scape dorsally brown, ventrally yellow; pedicel and flagellomeres 1–2 dorsally mostly light brown, apical flagellomeres dark brown, except flagellomeres 8–10 and most of 6–7 and 11–12, white; orbital band present only at supra-clypeal and supra-antennal areas; supraclypeal area, clypeus, mandible except apex, mouth parts and medial part of malar space, whitish (207,179,116); supra-antennal horn white; apex of mandible dark brown. Mesosoma  : dorsally brownish orange (150,098,050), ventrally yellowish (150,098,050); propleuron and collar whitish; wings hyaline; legs yellowish, fore leg lighter, hind coxa darker; fore and median tarsi centrally brown, median ones darker, most of hind pre-apical tarsomere brown, apical tarsomeres dark brown. Metasoma: ranging from orange in T 1-2 (196,134,035) to light yellow (240,219,127) at apical tergites; ovipositor brown, sheath dark brown, with lateral longitudinal white band.

Male. Very similar to female, but differs from it by the following: body more pilose; antenna with 27 flagellomeres; weaker swelling at supra-antennal area; fore wing crossvein 2 Cua about 0.5 as long as vein 2 cu-a; vein 2 -M longer than 3 -M; mesopleural fovea very shallow; justacoxal carina indistinct; pleural carina entirely absent; tarsi brown, except by hind tarsomere 1 posterior half, and hind tarsomeres 2–3, white; anterior transverse carina of propodeum centrally slightly arched; spiracle at T 1 prominent.

Variation. Body varying from light orange (213, 161, 071) to brownish orange (156, 100, 029); flagellomere 2 sometimes light brown; two specimens with orbital band reaching dorsal area of gena, dorsal margin of pronotum whitish, central lobe of mesoscutum dark brown, lateral margin of mesoscutum posteriorly whitish, thorax ventrally lighter, propodeum with anterior transverse carina very slightly arched forward; posterior half of hind tarsomere 1 and hind tarsomeres 2–3 sometimes whitish; pleural carina sometimes with very weak wrinkles restricted to anterior area; metasomal T 1–3 sometimes orangish.

Comments. Can be separated from A. fulvus  by having the head black with whitish marks (vs. head orange, ferruginous near ocelli); propodeum with very short, rather shallow punctures that are separated by about 7.0– 10.0x their diameter (vs. large punctures that are separated by about 1.3 x their diameter); and propodeum not wrinkled (vs. with weak coarse wrinkling). Differs from A. circumflexus  by the female flagellum with white band covering about 5 flagellomeres (vs. about 15); supra-antennal area with white central horn (vs. black), with longitudinal swelling very weak, slightly rugose (vs. more pronounced and rugose); orbital band present at supraclypeal and supra-antennal areas (vs. absent); sternaulus with very weak wrinkles at anterior 0.3 (vs. with anterior 0.5 wrinkled); propodeum with anterior transverse carina almost straight (vs. centrally arched forwards); propodeum and metapleuron with more sparse punctures that are separated by about 7.0–10.0x their diameter at propodeum and 5.0x at metapleuron (vs. more dense punctures that are separated by about 4.0–6.0x their diameter at propodeum and 3.0x at metapleuron); vein Cub straight (vs. slightly irregular); crossvein 1 cu-a forming slightly acute angle with M+Cu, basad of 1 M+Rs by about 0.15 of its own length (vs. convex, ending opposite to vein 1 M+Rs); pleural carina very weak, with short transverse wrinkles (vs. absent).

Etymology. From the combination of the Latin albus, meaning “white”, and cornus, meaning “horn”; in reference to the white horn at supra-antennal area.

Material examined. 9 Ψ and 1 ɗ. Holotype Ψ ( UFES): BRAZIL, ES, Cariacica, Reserva Biológica de Duas Bocas, Pau Amarelo, 23–25.X. 2005, yellow pans, Pt. 18 [field point], APAguiar et al. In good shape. Paratypes ( UFES): 1 Ψ from BRAZIL, ES, Cariacica, Reserva Biológica de Duas Bocas, Pau Amarelo, 23–25.X. 2005, yellow pans, Pt. 16, APAguiar et al.; 1 Ψ, same data except Pt. 17; 1 Ψ, same data except Pt. 18; 1 Ψ and 1 ɗ, same data except 27–29.X. 2005, Pt. 16; 1 Ψ, same data except Pt. 17; 1 Ψ, same data except Pt. 18; 1 Ψ from BRAZIL, ES, Santa Teresa, Estação Biológica Santa Lúcia, 09– 13.V. 2006, yellow pans, MTavares, CAzevedo et al.; 1 Ψ, same data, except 09.V. 2006.

Distribution. Atlantic Forest, Brazil, ES. Recorded from two close localities at Reserva Biológica de Duas Bocas (20 º 16 ’ 21 ”S 40 º 28 ’ 40 ”W) and Estação Ecológica Santa Lúcia (19 º 57 ’ 55 ”S 40 º 32 ’ 25 ”W) ( Fig. 14View FIGURE 14).

UFES

Universidade Federal do Espirito Santo