Isostenosmylus septemtrionalandinus, Ardila-Camacho, Adrian & Noriega, Jorge Ari, 2014

Ardila-Camacho, Adrian & Noriega, Jorge Ari, 2014, First record of Osmylidae (Neuroptera) from Colombia and description of two new species of Isostenosmylus Krüger, 1913, Zootaxa 3826 (2), pp. 315-328 : 324-325

Isostenosmylus septemtrionalandinus n. sp.

( Figs. 2 c, 3b, e, f, 5a, b, 6)

Diagnosis. Distinguished by having forewing speckled with few amber spots, numerous costal crossveins forked near to the costal margin. Female genitalia with gonocoxite VIII in ventral view y-shaped, apex with two elongated and widened lobes. Sternite VIII with two lateral mamiliform lobes moderately developped. Gonocoxites IX acuminate, with the posterior edge curved. Spermatheca reniform.

Etymology. Septemtrionalis, Latin, originating from the north; andinus, latinized form of the word “Andean”, originated from the Andes. Literally that this species is native to the Northern Andes.

Description. Body length: 18 mm; forewing length: 29 mm; hindwing length: 26 mm; length of pterostigma of the forewing: 4 mm.

Head. Clypeus and labrum pale ochre with setae of the same color. Mandibles pale ochre, changing to dark brown apically. Labial palpi with the first two segments ochre, the third dark brown; palpimacula semicircular. Maxillary palpi ligth brown. Frons brown pigmented, with two dark brown spots below antennae. Scape widened, almost as long as the pedicel, the latter slender, both dorsal- and ventrally with diffuse dark brown pigmentation. Flagellomeres nearly as broad as long, densely covered with pale ochre setae. Vertex diffusely brown pigmented with brown setae; sutures bordering with dark brown; occiput pale ochre.

Thorax. Prothorax narrow, as long as mesothorax; pronotum diffusely brown pigmented, with two posterolateral elongated spots, entire surface covered with abundant dark brown setae arising from protuberant bases. Mesonotum with a mixture of ochre and brown, mesoprescutum with two lateral brown spots, mesoscutum anterolaterally with two pairs of dark brown spots ( Fig. 2 b); entire surface with numerous brown setae arising from protuberant bases. Metanotum ligth brown with two lateral dark brown spots and few translucent setae. Pteropleura predominantly pale ochre, in posterior sclerites with brown spots near to wing bases ( Fig. 2 e), entire surface covered with long and pale ochre setae.

Legs. Forecoxa almost as long as the femur, in females with short dentiform process located on the dorsal surface near to apex ( Fig. 2 e); mid- and hindcoxae short. All segments pale ochre, femora and tibiae with numerous brown spots. The entire surface covered with long pale ochre setae. Tibial spurs short and amber in color. Tarsi five-segmented; tarsal claws amber, arolium present.

Wings. Forewing membrane hyaline, venation alternating pale yellow and brown, densely covered with setae. Costal field wide, with 53 crossveins, numerous forked. Base of Sc vein slightly thickened. Radial field with four light amber spots. Two nygmata present, the first after of the MA fork, the second at level of the second Rs fork. Rs with 13 branches and two series of gradate crossveins, inner with five or six veinlets and outer with 15 or 16, some with amber spots. Pterostigma very pale yellow with pale gray-brown spots. Wing base with a spot at level of the first Rs fork, extending from the MA to 1A. Basal crossveins arising from 1A clearly sinuous. Hindwing with membrane hyaline, venation alternating pale yellow and pale greyish brown. Rs with 12 branches. Nygmata present, the first, before the MA fork, the second at level of the second Rs fork.

Abdomen. Tergites with mottled pigmentation pattern, consisting of a mixture of dark brown, light brown and ochre; tergite IV–VIII with long ochre setae at the posterior edge of each segment. Sternites pale yellow. All segments covered with pale yellow setae.

Female terminalia. Sternite VII in lateral view, posteroventrally slightly produced ( Fig. 2 f); in ventral view, posteromedially with a subquadrate lobe slightly concave at posterior edge ( Fig. 5 b). Sternite VIII slightly sclerotized, in lateral view with strong concavity at base, towards the midlength with two lateral mamiliform lobes anteroventrally projected ( Figs. 5 a, b); in ventral view, with two lateral lobes at anterior region, medially with longitudinal ridge ( Fig. 5 b). Gonocoxite VIII (length: 1.2 mm), in lateral view anteroventrally with prominent rounded lobe ( Fig. 5 a), medially narrow; apically with lobes laterally projected, slightly widened, rounded at apex; in ventral view y-shaped, basally with a ridge at basal half, medially narrow, apex with two long lateral lobes laterally projected, posteromedially with v-shaped concavity ( Fig. 5 b). Gonocoxites IX (length: 1.1 mm), acuminate ( Fig. 2 f). Ectoproct with posterior edge rounded. Spermatheca (length: 0.3 mm) reniform in lateral view ( Fig. 5 a).

Male. Unknown.

Type material. Holotype ♀, Norte de Santander: Nudo de Santurbán, Poveda stream, 07°27’N − 72°49’W, 2000 m, 18-III-03-IV-2002, A. Santamaría, Malaise trap, M.3106 (IAvH).

Holotype condition: good, lacking apical half of the antennae, wings spread, genitalia dissected and cleared, stored in a microvial with glycerin.

Remarks. This species is very closely related with I. fusciceps by the slight sclerotization of pterostigma and the light pigmentation of forewing, but is unique in having numerous costal crossveins forked near to the costal margin and basal crossveins arising from 1A clearly sinuous. Further, the base of subcostal vein of forewing is unthickened.

Figures

FIGURE 2. Isostenosmylus spp., female: a, Isostenosmylus sp.; b, I. contrerasi; c, I. septemtrionalandinus.

FIGURE 5. Isostenosmylus spp.: a, b, I. septemtrionalandinus, (a) female terminalia, lateral, (b) female terminalia, ventral; c – e, Isostenosmylus sp., (c) female terminalia, lateral, (d) spermathecae, lateral, (e) female terminalia, ventral.