Isostenosmylus irroratus Ardila-Camacho, Martins & U. Aspöck, 2016

Martins, Caleb Califre, Ardila-Camacho, Adrian & Aspöck, Ulrike, 2016, Neotropical osmylids (Neuroptera, Osmylidae): Three new species of Isostenosmylus Krüger, 1913, new distributional records, redescriptions, checklist and key for the Neotropical species, Zootaxa 4149 (1), pp. 1-66 : 16-19

Isostenosmylus irroratus Ardila-Camacho, Martins & U. Aspöck n. sp.

( Figs 8 , 9 )

Holotype, ♀, Venezuela: Miranda, Núcleo, Laurel , 10°22’10.24’’N −66°53’43.11’’W, 1200~ 1800 m, 18.x.1971, A. Montagne (MIZA −0018833).

Condition good. Wings extended, tip of right forewing lacking; left antenna lacking. Abdomen dissected, cleared, preserved in glycerin in a plastic tube associated with the specimen.

Distribution ( Fig. 43 ). Venezuela (Miranda).

Diagnosis. Distinguished from other species of the genus by having the wing membrane of forewing with numerous and scattered amber spots, located inside cells or bordering crossveins and forks of longitudinal veins. A conspicuous brown spot between MP and 1A veins, at the level of the first fork of Rs. In both wings, pterostigma scarcely defined, greyish brown, translucend. Seventh sternite produced posteromedially and medially incised. Fused ninth gonapophyses in ventral view with apical half semitriangular, apex laterally with two pairs of short and blunt lobes, distal margin medially concave. Spermatheca ellipsoid.

Description. Head ( Fig. 8 C). Mainly brown, with a dark brown spot behind each antennal socket. Scape and pedicel brown, flagellum brown, composed of aproximately 36 articles, nearly two times as wide as long, and densely covered with brown or light brown setae. Compound eyes dark purplish. Vertex with interocellar surface behind the corneal lenses of ocelli dark brown, and with 5–6 prominent light yellow setae arising from protuberant bases behind each ocellus.

Thorax ( Figs. 8 A, C). Thorax length 4.72 mm, prothorax elongated, nearly two times as long as wide, pronotum, lateraly with two dark brown stripes, entire surface rough, covered with fine light brown setae, periferal and medial regions with scattered prominent setae, dark brown or light yellow, arising from protuberant bases. Mesonotum, nearly as long as wide, predominantly brown, dark brown at the periphery, entire surface with numerous, scattered and prominent setae, dark brown or tan setae, arising from protuberant bases. Metanotum light brown, scutellum medially with a pair of brown spots.

Legs. Predominantly tan, covered with numerous fine yellow setae, tibiae with brown semicircular spots at base of each seta. Tarsi yellowish brown.

Wings ( Fig. 8 B). Forewing length, 23.29 mm, maximum width 7.73 mm; membrane hyaline with numerous amber spots, bordering crossveins and forks of longitudinal veins; wing venation, densely setose, with an irregular pigmentation pattern, alternating brown and pale yellow. Costal field widened, with 64–66 unforked crossveins before pterostigma. Pterostigma (length 3.26 mm) weakly pigmented, translucent greyish brown, composed of 17 crossveins. Apex beyond pterostigma with five crossveins. Subcostal field with some amber spots, basally with a single crossvein. Radial field with 28 veinlets, some of these, bordered with amber suffusion. Substigmal cell elongated, curved. Rs with 11–13 branches, numerous amber spots located inside cells or bordering crossveins and forks of longitudinal veins; 13 gradate crossveins. Four presectoral crossveins. Basal nygma, reduced, located between second and third or third and fourth crossvein between MA and MP veins. Distal nygma located between the first branch of Rs and MA, alternatively it is located between the first and second branch of Rs, at the level of the second and third or third and fourth branch of Rs, it is bordered with an amber suffusion. Area between MP and 1A, at the level of the first Rs branch, with a conspicuous spot, irregularly shaped, located between two smaller spots in the cubital field. Hindwing (length 20.16 mm, maximum width 6.53 mm), membrane hyaline, except at base where it is light amber; venation densely setose, basally pale yellow, with some greyish brown spots, in the distal half alternating pale yellow and greyish brown. Costal field with 50 crossveins before pterostigma, five veinlets in the costal field, beyond pterostigma. Pterostigma scarcely defined, translucent greyish brown, composed of 16 veinlets. Subcostal field hyaline, with a single crossvein at base. Radial field with 20 crossveins. Rs with 11 branches, 15 gradate crossveins; four presectoral crossveins. Basal nygma reduced, located between Rs+MA and MP, before separation of MA and Rs; distal nygma located between the first Rs branch and MA, at the level of stem of second Rs branch. MP2 fork arising at the level of the third or fourth fork of Rs. Area between CuA and CuP with 16 cells; CuP forks originating near to the level of Rs+MA stem.

Female genitalia ( Fig. 9 ). Seventh sternite, in lateral view, produced posteroventrally, and connect posteriorly with the fused eighth gonapophyses; in ventral view, with a medially incised projection posteromedially. Fused eighth gonocoxites + gonapophyses plate shaped, elongate, in ventral view with lateral margin sinuous, posterodorsally with a lobe moderately developed, covered with long setae; in ventral view subquadrate, with a lobe slightly developed posterolaterally, laterally projected and covered with some long setae. Fused ninth gonapophyses elongated, in lateral view medially slightly curved dorsad, apex with two lobes slightly developed, the dorsal one projected anteriorly, the ventral one projected anteroventrally; in ventral view, constrained medially, the apical half semitriangular, apex with two short and blunt laterally projected lobes, and the distal margin concave. Eighth tergite laterally enclosing spiracle of eighth abdominal segment, anteroventral corner slightly projected ventrally. Ninth tergite, laterally elongate, projected ventrally, and with an anteroventrally rounded lobe equipped with numerous setae. Ectoproct in lateral view semicircular, posterior margin with numerous long setae, callus cerci with trichobothria arranged in a rosette. Ninth gonocoxites acuminate, with ventral margin straight, densely covered with numerous setae; ninth gonostylus ovoid, equipped with small setae. Spermathecae ellipsoid in lateral view.

Etymology. The specific epithet irroratus is derived from the Latin irrorare = bedew, in reference to the wing pigmentation pattern of this species. An adjective (actually the perfect participle) in the masculine gender.

Male. Unknown.

Figures

FIGURE 8. Holotype of Isostenosmylus irroratus n. sp., female. A) Habitus dorsal; B) Wings; C) Head and prothorax, dorsal view; D) Labels. Photos provided by Marco Gaiani (Museo del Instituto de Zoología de la Facultad de Agronomía de la Universidad Central de Venezuela, Maracay, Venezuela).

FIGURE 9. Holotype of Isostenosmylus irroratus n. sp., female. A – B) Terminalia, lateral view; C – D) Terminalia, ventral view. ect (ectoproct), gcx VIII (eighth gonocoxite), gcx IX (ninth gonocoxite), gph VIII (eighth gonapophysis), gph IX (ninth gonapophysis), S VII (seventh sternite), spm (spermatheca), T VII (seventh tergite), T VIII (eighth tergite), T IX (ninth tergite). Photos provided by Marco Gaiani (Museo del Instituto de Zoología de la Facultad de Agronomía de la Universidad Central de Venezuela, Maracay, Venezuela).

FIGURE 43. Distribution of Neotropical Osmylidae species. 1) white star, I. contrerasi; cross, Isostenosmylus sp.; red star, I. bifurcatus n. sp.; white triangle, I. septemtrionalandinus; white circle, I. fasciatus; red triangle, I. irroratus n. sp. 2) asterisk, I. nigrifrons; cross, I. morenoi; red circle, I. julianae n. sp.; star, I. fusciceps; white circle, I. fasciatus. 3) circle, I. pulverulentus; red star, G. adspersus. 4) white star, K. digoniostigma; white circle, K. tjederi; green circle, K. falcatus; red triangle, K. crenatus; cross, Ph. caprorum.