Filchneria olgae
Creators: name: Teslenko, Valentina A.
name: Palatov, Dmitry M.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Filchneria
Filchneria olgae

description: Filchneria olgae (McLachlan, 1875)
Figs. 49–83
McLachlan, 1875: 49, Table IV, figs. 10 a, b, Dictyopteryx Olgae. Lectotype, male and paralectotypes (1 male 4 females) deposited in ZMMU, Moscow, Russia; Klapálek, 1912: 23, Figs. 19 A, B (Skobeleva Olgae); Ricker, 1952: 140, figs. 86, 88, 89, (Skobeleva olgae); Illies, 1966: 390, Skobeleva olgae; Raušer, 1968: 362, (Skobeleva olgae); Zhiltzova, 1971: 1035, (Dictyopteryx olgae); Zwick, 1973: 228, 230, (Filchneria olgae); Zwick, 1997: 494, figs. 6 (b‒d), Teslenko & Zhiltzova, 2009: 24, 102–104, (Filchneria olgae).
Diagnosis. Males of F. olgae have an obtuse angled (angle about 120°) posterior margin of tergum 10. The paraproctal sclerite is short, wide, and strongly sclerotized, resembling a rectangle with a Ⅽ-shaped notch along the inner margin; the apices of the notch are sharp and short. The aedeagus bears unpaired anterodorsal and posteroventral lobes, and two pairs of lateral lobes with one pair of lateral lobes being fingerlike. Females of F. olgae are distinguished by a short, wide subgenital plate with a straight or slightly wavy posterior margin, the lobes being weakly expressed, and the lateral edges are slightly truncated. Eggs of F. olgae bear clear longitudinal and transverse ridges, a stalked collar, and a rim that is slightly triangular with a wavy outer edge, and a smooth longitudinal carina present. The chorion is rough and evenly covered with flat rounded tubercles that have a distinct groove at the base. Micropyle orifices lack lip-like extensions.
Complementary description. Adult habitus. Filchneria olgae was firstly described based on male and female by MacLachlan (1875) on the materials by A.P. Fedchenko outstanding explorer of the Central Asia. Type seria of F. olgae specimens is shown below (Fig. 49). The original description was carried out on base of the coloration and shape of the female subgenital plate and, in general, is consistent with the studied specimens (McLachlan 1975). Complementary description is given below based on the type material and relatively fresh specimens.
Both sexes may have shortened wings, males may also be brachypterous, females ‒ macropterous; wings are transparent with brown veins; the venation configuration is typical to Filchneria (Figs. 52, 55, 65, 66). The general body color brown, males are dark brown (Figs. 65, 66). Head brown, M-line brown (Figs. 51, 56, 67, 68). The interocellar area carries a small yellow spot slightly widened posteriorly (Figs. 51, 56, 67, 68). A yellow Ushaped band extends across the occiput, forming triangular medial projections along the epicranial stem; a brown posterolateral spot behind each compound eye (Figs. 51, 56, 67, 68). Antennae are brown, palpi pale. The pronotum brown with relatively thin yellow median band slightly widened posteriorly, the pronotal rugosities dark brown forming X-shaped pattern (Figs. 65–68). Legs are brown, with wide brown band on femur and dark brown stripe on tibia basally (Fig. 66). Cerci light brown, each cercal segment darker distally (Fig. 65).
Male. Body length 13.3‒16.8 mm (n=5). Wings short, not reaching the posterior margin of tergum 3 (Figs. 52, 66). Terga 4‒9 humped laterally. Abdominal terga 1–6 brown, sometimes longitudinal row of 8–12 very small pale spots visible; the middle pair of spots is more pronounced than the others (Fig. 66). Terga 7–8 with butterfly-shaped pale sport; in tergum 8 a pale spot expanded posteriorly and divided by a median, triangular, and pale spot, widened anteriorly; two submedial swellings densely covered by sensilla basiconica and brownish hairs close to the posterior margin (Figs. 52, 66, 69). Tergum 9 is half hidden under tergum 8, sclerotized laterally; posteromedial half membranous with two swellings, covered with sensilla basiconica and brownish hairs posterolaterally (Fig. 69). Tergum 10 pale in caudal view up curved (Figs. 52–54, 66, 69–71); in dorsal view the posterior margin of tergum 10 with thin brown line, obtuse angled (angle about 120°), bears posteriomedial patch of short and sparse sensilla basiconica distributed to one-thirds of the tergum length in the middle (Figs. 54, 74). The paraproctal sclerite is short, wide, and strongly sclerotized, resembling a rectangle with a Ⅽ-shaped notch along the inner margin; the apices of the notch are sharp and short (Figs. 53, 66, 69–71). In repose paraproctal sclerite surrounds a triangular membranous lobe rounded at the top, coated by fine sensory scales and small thin spinules dorsally and dorsomedially (Figs. 69, 71). Naturally everted aedeagus membranous, short and wide bears unpaired anterodorsal and posteroventral lobes, and two pairs of lateral lobes (Figs. 71, 73). The anterodorsal lobe spherical dorsally; a cuticular triangular swelling adjoins the anterodorsal lobe ventrally with anterolateral fingerlike cuticular lobes directed downward, theirs apices are narrowed (Figs. 71, 72). At the bases of anterolateral lobes there are additional small lateral swellings ventrally which adjacent to unpaired, large, and transverse posteroventral lobe, bearing large posterolateral swellings resemble auricles; in ventral view the lobes are fan-shaped (Fig. 73).
Female. Body length 17.8‒21.5 mm (n=5). Sterna 1‒7 yellow with a thin brownish band anteriorly and a pair of small brownish spots laterally (Figs. 75, 76). Sternum 8 pale with a pair of rounded brown spots laterally and a pair of oblique dark brown lateral sclerites surrounding the brownish subgenital plate anterolaterally (Figs. 57, 58, 75, 76). Subgenital plate is short and wide, extending about three-quarters of the sternum 8 widths (along posterior margin) and about a quarter of the sternum 9 lengths, with an almost straight or slightly wavy posterior margin; the lobes are weakly expressed; the lateral edges are slightly truncated (Figs. 58, 75,76). Subgenital plate covered with short brown setae (Figs. 75, 76). Sternum 9 medially pale with a pair of brown rounded spots laterally, turning into curved brown stripes directed upwards under the subgenital plate (Figs. 58, 75, 76). Sternum 10 is usual, pale. Paraprocts are dark brown at the base of cerci; tips are pale.
Egg. Medium size, trilateral, with mean dimensions of 416×274 μm (n=11). The transverse and longitudinal ridges are clearly visible, the longitudinal ridges are rather thick and bulged (Figs. 59, 60, 64, 77, 78). The collar is stalked, rim slightly triangular with a wavy outer edge, dorsally (Figs. 61–63, 78, 79, 81). The sides of the collar bear smooth longitudinal carinae (Fig. 81). The anchor plate mushroom-shaped or pan-shaped evenly covered with large globular bodies (Figs. 77, 79, 80). A transverse row of 4‒6 micropyles subequatorial, slightly closely to transverse ridge (Figs. 59, 60, 77, 78); micropyles clearly visible, their orifices without lips, some set close to micropyles mounds (Fig. 82). The chorion surface is rough with numerous flat rounded tubercles, located relatively evenly over the entire surface (Figs. 59, 60, 77, 78, 82). The base of the tubercles has a distinct groove (Fig. 83).
Material examined: Lectotype male (present designation), paralectotypes 1 male, 4 females, Uzbekistan, Samarkand city, vicinity, Zeravshan River Basin (authors note), 14 March, 1869, coll. Fedchenko A.P., det. McLachlan. Lectotype: № ZMMU Ple-0001, Zool. Mus. Mosq. Univ. (Mosquae, ROSSIA) (Fig. 50). Uzbekistan, Western Tian-Shan, Talas Alataw, 3 males 3 females, Chirchiq River in the area of construction of the Charvan power station (Syr-Darya River Basin), 28.03.1968, (ZIN). Tajikistan, Pamir-Alay mountain system, 2 males 2 females, Ramit Nature Reserve, Sardan-Miyona River, 17.03.1987, coll. L. Zhiltzova (ZIN).
Distribution. Filchneria olgae has an early spring emergence in March. It inhabits mountain watercourses of interfluves of the large Central Asian Amu-Darya and Syr-Darya Rivers at elevations of 700 m and above, the upper limit of the habitat has not been established. In Uzbekistan the species was found in the vicinity of Samarkand city, located in the middle reaches of the Zeravshan River (Amu-Darya R. Basin) and in the Chirchiq River (Syr-Darya R. Basin) in West Tian Shan, Talas Alataw. Also F. olgae was found in Tajikistan (State Natural Reserve "Ramit"), in the Sardai-Miyona River which flows down from the southern slopes of the Gissar Ridge of the Pamir-Alai Mountains, stretching over 200 km from the east to the west direction across Tajikistan and Uzbekistan.
description: Published as part of Teslenko, Valentina A. & Palatov, Dmitry M., 2023, Redescription of a few Filchneria Klapálek, 1908 (Plecoptera, Perlodidae) species on the type and fresh material, pp. 287-312 in Zootaxa 5277 (2) on pages 302-307, DOI: 10.11646/zootaxa.5277.2.3, http://zenodo.org/record/7889837