Diamphipnopsis oncolensis, Sánchez, 2018

Sánchez, Alejandro Vera, 2018, Two new species of Diamphipnoidae (Insecta: Plecoptera) from Chile, with description of adults and eggs, Zootaxa 4527 (1), pp. 49-60 : 54-57

publication ID	https://doi.org/ 10.11646/zootaxa.4527.1.4
publication LSID	lsid:zoobank.org:pub:E0F37BA8-A163-47F8-ADCF-B4C720B2185A
DOI	https://doi.org/10.5281/zenodo.5952048
persistent identifier	https://treatment.plazi.org/id/039087D5-6102-FF92-FF6C-FB19FBF6F82C
treatment provided by	Plazi
scientific name	Diamphipnopsis oncolensis
status	sp. nov.

Treatment

Diamphipnopsis oncolensis View in CoL sp. nov.

( Figs. 5–8 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Type material. Holotype male: Chile, Región de los Ríos, Valdivia Province, Parque Oncol , 6 X 2006, coll. E. Arias, ( MNNC) . Paratype: 6 males and 2 females same locality as holotype except dates (3 males, 1 female 6 X 2006; 3 males 20 I 2006; 1 female 13 I 2006) ; 1male, 1 female, Región de los Ríos, Valdivia Province, Curiñaco 6– 16 I 2006, ( MNNC) .

Etymology. Derived from “Oncol” for Parque Oncol and the Latin “ensis” from place of origin.

Diagnosis. A small species of the genus, general coloration green with abundant dark spots on the head, thorax and legs; abdomen with divergent white bands on the terga VII–IX, center of the tergum X yellowish white; wings light green, forewings with RP and CuA with 2 bifurcations, M with 1 or 2 bifurcations, varying in the same individual. Male trapezoidal tergum X, without dorsal tubercles, depressed midline, rounded denticulate ventral plate; epiproct elongated, with acute and flexible apex, middle portion cylindrical and elongated; cylindrical paraprocts with rounded apex, truncated ventral sclerite, small reversible membranous lobe. Female truncated subgenital plate, spermatheca with short simple duct and oval capsule. Eggs large without a collar, narrow annulus, chorion covered with aeropiles, with abundant scattered tubercles, these are of circular shape and flat surface.

Description. Adults habitus: Small for the genus; general color green-yellowish ( Fig. 5A View FIGURE 5 ); head, thorax and legs with abundant irregular dark green spots. Forewings green with brown marginal spots and yellow around transversal veins. Abdomen with divergent white bands on the terga VII–IX.

Measurements: Holotype male, total length 24 mm; antennae length 34 mm; cercus length 6 mm; head width 4 mm; pronotum width 4 mm; pronotum length 3 mm; forewing length 34 mm; hindwings length 22 mm.

Paratype males (n=7): total length 21–26 mm; antennae length 32–38 mm; cercus length 6–7 mm; head width 3.5–4.0 mm; pronotum width 3.5–4.0 mm; pronotum length 2.5–3.0 mm; forewing length 32–38 mm; hind wings length 21–24 mm.

Paratype females (n=3): total length 26–33 mm; antennae length 33–41 mm; cercus length 6 mm; head width 3–4.5.0 mm; pronotum width 4–5 mm; pronotum length 3–4 mm; forewing length 23–25 mm; hind wings length 22–23 mm.

Male (holotype): Head ( Fig. 5B View FIGURE 5 ) equidistant ocelli; green, yellow in clypeus margin, frons with V-shape spots, on the side of the ocelli, two post ocular bands on the occiput; antennae with green scape and pedicel, flagellum yellowish, 84 flagellomeres.

Thorax: Pronotum rectangular ( Fig. 5B View FIGURE 5 ), 0.25 times wider than long, narrower than the width of the head, angles rounded; with irregular design of green markings, posterior margin and medium line yellowish. Meso- and metanotum with two dark green longitudinal bands and abundant irregular dark green spots as in the Fig. 5A View FIGURE 5 ; prosternum with acute anterior margin, apex rounded.

Legs: Greenish with dark spots; femur with dark spots scattered on their dorsal side, flexor and extensor margin with intermittent rows of black spots, with fine setal fringes on the flexor margin; tibiae green, with five to seven dark bands, tarsi green, tarsomeres with proportions for front leg and middle leg 2:1:2, hind leg 3:1:3; claws acute with tiny denticles; arolium large; first and second tarsomeres with membranous pads developed as ventral extensions.

Wings as in Fig. 5C View FIGURE 5 ; light green, with green costal apex, veins apex with brown spot; reduced reticular venation (as compared with D. virescentipennis ). Forewing apex rounded, transverse veins bordered by yellow, RP to CuA with irregular brown spots, RP with two bifurcations and M with one or two bifurcations (one in leftwing, two in right). Hind wing with yellow M-AA2; RP with two bifurcations, M and CuA close, αAA2 with two bifurcations.

Abdomen: Terga green with white bands ( Fig. 5A View FIGURE 5 ); terga I–VI with two parallel white bands on medium longitudinal line; terga VII – IX with divergent white bands; tergum X yellow in medium and apex ( Fig. 6A View FIGURE 6 ). Tergum X in lateral view ( Fig. 6B View FIGURE 6 ) dorsally flat, without prominent tubercle; in dorsal view ( Figs. 6A, C View FIGURE 6 ) trapezoidal, wider at base, narrowing to apex, truncate, posterior angles with small tubercles, middle tergum depressed with a V-shape deep emargination; in lateral view the medium sclerotized emargination continues in a ventral toothed rounded plate as in Fig. 6B View FIGURE 6 .

Epiproct ( Figs. 6B, C View FIGURE 6 ) proximally lacking a dorsal tooth; medial region cylindrical, narrow and long; with long distal extreme (longer than in other species of Diamphipnopsis ); apex acuminate and flexible.

Paraprocts ( Fig. 6D View FIGURE 6 ) cylindrical; rounded apex, not prominent; with ventrolateral sclerite narrow; ventral sclerite truncate; medium-dorsal membranous lobule small and eversible.

Subgenital plate with posterior margin rounded. Cerci with 23 segments.

Female: Habitus similar to the male; but larger.

Abdomen: Similar coloration to males; tergum X triangular, dorsally flat, with rounded apex ( Fig. 7A View FIGURE 7 ); triangular paraproct of acute apex. Subgenital plate small, trapezoidal, posterior margin truncated, rounded angles and sclerotized ( Fig. 7C View FIGURE 7 ); convex in lateral view ( Fig. 7B View FIGURE 7 ). Bursa copulatrix as a conical sac similar in size to the subgenital plate, without sclerites, only the dorsal midline is sclerotized ( Figs. 7D, E View FIGURE 7 ). Spermatheca on the posterior margin of the bursa copulatrix; short sigmoid duct, arranged to the right, oval capsule ( Fig. 7E View FIGURE 7 ).

Eggs: Cylindrical shape (Figs. 11A, F), diameter 1.06– 0.98 mm, length 0.80– 0.68 mm. With two similar poles, depressed polar disc (Fig. 11C); without collar; in equatorial view the annulus is a little regular depressed (Fig. 11A). Chorion surface covered with tiny aeropyles; presents prominent, circular and flat tubercles with marginal aeropyles (Figs. 11B, D); these tubercles are distributed irregularly separated from each other. Flat polar discs, without tubercles, in one of the poles the disk has a marginal ring of large tubercles (Fig. 11F); the other has small tubercles that do not constitute a ring (Fig. 11C). Micropyles unidentified.

Remarks: In some specimens the pronotum is widest at the anterior half. Four specimens are grayish with discolored spots on the body and wings. It may be that these specimens were faded by the preservative used in the Malaise trap. Male and female paratypes exhibit variability in the bifurcations of the forewings veins: RP 2–4, M 3–1, CuA 2–4; and unusual fusions, for example, two branches of M fused with posterior branch of RP and anterior braches of CuA, respectively. This variability may be different in right and left wings.