Perlodinella kuenluensis ( Šámal, 1935 ) Teslenko & Palatov, 2023

Teslenko, Valentina A. & Palatov, Dmitry M., 2023, Redescription of a few Filchneria Klapálek, 1908 (Plecoptera, Perlodidae) species on the type and fresh material, Zootaxa 5277 (2), pp. 287-312 : 295

Perlodinella kuenluensis ( Šámal, 1935) comb. nov.

Figs. 23–34

Šámal, 1935: 221, figs. 1a, b, Perlodes (Megarcys) kuen-luensis . Dry specimens one male and one female with red labels ‘Typus’ from Coll. Zôlogisch Museum Amsterdam deposited in Naturalis, Leiden, the Netherlands. Claassen, 1940: 113 Perlodes kuen-luensis ; Brinck, 1950: 137, figs. 3A, 3C, Perlodes (Perlodinella) kuen-luensis ; Ricker, 1952: 140, Skobeleva (Megarcys) kuen-luensis incorrect original spelling; Brinck, 1954: 137, Skobeleva kuenluensis ; Illies, 1966: 389, Skobeleva kuenluensis ; Zwick, 1973: 229, Filchneria kuenluensis ; Li & Murányi, 2015: 51, Filchneria kuenluensis .

Diagnosis. Filchneria kuenluensis is a fairly dark species, having an oval narrow pale spot in the interocellar area. The male of F. kuenluensis is distinguished by the shape of the posterior margin of tergum 10 which is strongly elevated and drawn out, appearing as a conical hood, pointed at the apex, and covered with sensilla basiconica dorsally. The paraproct is finger like and paraproctal sclerite bears a hook near to the rounded top. The female is distinguished by a strongly sclerotized triangular bilobed subgenital plate that is expanded posteriorly. The posterior margin of the subgenital plate has a triangular notch in the middle dividing two triangular lobes. The posterolateral edge of each lobe is rounded and slightly drawn downward laterally.

Supplementary description. The original description of F. kuenluensis was carried out on male and female syntypes as Perlodes (Megarcys) kuen-luensis , including sizes and color pattern ( Šámal 1935). Later, Brink (1950) pointed out briefly the male paraproct structures which were omitted in the original description. A supplementary description of the type material, taking into account its age and state of preservation is given below.

Head brown with a dark brown M-line; median interocellar area dark brown with an oval narrow pale spot ( Figs. 23 , 30 ). Occipital area is brown. Pronotum dark brown with even darker narrow strip along anterior and posterior margins, rugosities are dark brown ( Figs. 23 , 30 ). Lateral arms of meso-furcasternum meet posterior corners of furcal pits ( Fig. 28 ).

Male. Syntype ( Fig. 27 ). Abdominal terga 7–9 swollen posterolaterally, posteromedial margins covered with sensilla basiconica and very long brown hairs ( Fig. 26 ). Tergum 10 entire, in lateral view with strongly elevated and drawn out posterior margin, appearing as conical hood, pointed at the apex, and covered with sensilla basiconica dorsally ( Figs. 24–26 ). Paraproct finger-shaped, swollen, narrowed distally, and rounded at the top ( Figs. 24, 25 ). The paraproctal sclerite wide and heavily sclerotized basally, in apical half paraproctal sclerite slender, bears hook directed outward ( Fig. 25 ). Naturally everted aedeagus looks like a membranous tube with a pair of lateral lobes at the base, ventrally, aedeagal apex narrowed, funnel-shaped with cuticular swellings ( Fig. 24 ).

Female. Syntype ( Fig. 34 ). Abdominal sterna are pale-brown ( Figs. 31, 32 ). Subgenital plate strongly sclerotized, triangular, bilobed expanding posteriorly, and occupying about half of sternum 8 width, and one third of sternum 9 lengths ( Figs. 31, 32 ). The posterior margin with a triangular notch in the middle divides plate into two triangular lobes. The posterolateral edge of each lobe is rounded and slightly drawn downward laterally ( Fig. 32 ). Sternum 9 bears brown patch on each side.

Egg. Trilateral, broadly oval, longitudinal ridges delimit the three sides. Apparently there is a collar ( Fig. 33 ). Other details and the chorion structure are indistinctive.

Material examined. Coll. Zôlogisch Museum Amsterdam. Typus. Male. ZMA. INS. 5101771. P. kuen-luensis . Typus. Female. ZMA. INS. 5101021. Perlodes kuen-luensis . Filchneria kuenluensis (Šámal) . Between Sanju Basar & Suget-Karaul, 1880–3600 m, 19–31. V.1930. Nederlandsche Karakorum Expeditie, J. A. Sillem leg. Det. Dr. Šámal. Det. P. Zwick 1979 (Naturalis).

Distribution. The species is only known from the types collected in Tibet Plateau, Kunlun Mountains, China, Xinjiang, between Sanju Bazar and Suget Karaul (the modern 'Saitula' town).

Remarks. The shape of the posterior margin of tergum 10 of F.kuenluensis male resembles that of F.mesasiatica ; however, the paraproctal sclerite of F. mesasiatica lacks an apical hook. The male of Zhiltzovaia amabilis ( Jewett, 1958) has the paraproct sclerite with a narrow, truncated knob dorsally and larger rounded knob ventrally, while in F. kuenluensis the ventral knob at the base of the cerci was not found ( Fig. 24 ). The male of F. kuenluensis in shape of tergum 10 and the paraproct structure is similar to that of Perlodinella kozlovi Klapálek, 1912 ( Fig. 29 ) and to Perlodinella apicalis Kimmins, 1947 consistent with Brink (1950), who assigned F. kuenluensis on these features to typical Perlodinella ( Klapálek 1912) . Since, according to recent publication ( Huo et al. 2022) a clawlike process in the apical part of paraproctal sclerite is one important diagnostic feature of the Perlodinella , we proposed to transfer Filchneria kuenluensis to Perlodinella with the valid name Perlodinella kuenluensis ( Šámal, 1935) comb. nov.

Figures

FIGURES 23–29. Perlodinella kuenluensis (Šámal, 1935) comb. nov. from Tibet Plateau, Kunlun Mountains, China. Syntypus. Male: 23. Head and pronotum, dorsal. 24. Abdominal tip, with not everted paraprocts, caudal. 25. Terga 9–10 with chaetotaxy, paraproctal sclerite with hook, lateral. 26. Abdominal tip, lateral. 27. Collecting labels of the type specimen. 28. Meso-furcasternum, ventral. Photos were taken by P. Ciliberti. 29. Perlodinella kozlovi Klapálek, 1912, from Yangtze River Basin, China, deposited in ZIN with the “Cotype” label. Male, the paraproctal sclerite with hook.

FIGURES 30–34. Perlodinella kuenluensis (Šámal, 1935) comb. nov. from Tibet Plateau, Kunlun Mountains, China. Syntypus. Female: 30. Head and pronotum, dorsal. 31. Abdominal tip, with subgenital plate, ventral. 32. Abdomen with subgenital plate and eggs, ventral. 33. Eggs. 34. Collecting labels of the type specimen. Photos were taken by P. Ciliberti.