Oligoneuriella pallida
Year: 2025
Type: other
Abstract: Oligoneuriella pallida (Hagen, 1855) Oligoneuria rhenana var. pallida Hagen, 1855: 268 (one male and one female adult, from Hungary). Oligoneuria pallida: Eaton, 1871: 56 (male, female, from Hungary) (synonymized to Oligoneuria rhenana Imhoff, 1852 by Eaton 1883: 31 and Jacobson & Bianchi 1905: 872 by mistake); Szilády 1912: 55 (from Romania)(restated and transferred to genus Oligoneuriella as Oligoneuriella pallida by Sowa 1973: 660; male was designated as lectotype and female as paralectotype by Mol 1984: 126). Oligoneuriella rhenana: Ujhelyi 1966: 204 (Hungary) (nec Oligoneuria rhenana Imhoff 1852: 177) (mis-identification, corrected by Kovács et al. 1999: 350). Oligoneuriella yugoslauica Ikonomov, 1958: 858 (nomen nudum)(synonymized by Mol 1984: 126) (Yugoslavia). Oligoneuriella poecile Ikonomov, 1960: 44; 1962: 69 (nymph, Yugoslavia, nomen nudum) (synonymized by Mol 1984: 126). Oligoneuriella mikulskii Sowa, 1961: 287 (nymph, Poland); Keffermüller 1978: 101 (male and female, Poland) (synonymized by Mol 1984: 126). Oligoneuriella mongolica Soldán et Landa, 1977: 14 (male and female, Mongolia) (synonymized by Kluge 2004: 141 but without reason). Oligoneuriella pallida: Tshernova et al. 1986: 136 (key, Russia); Chovet & Lécureuil 2001: 125 (nymph, France); Beketov 2007: 387 (south-west Siberia, Russia); Tiunova 2008:185 (Amur River, Russia); Kovács et al. 2008: 124 (Lithuania); Kluge 2009:121 (East Siberia, Mongolia); Tiunova & Bazova 2010: 327 (Selenga River, Russia and Mongolia); Bauernfeind & Soldán 2012: 233 (Europe); Sroka et al. 2015: 329 (comparison); Zhou et al. 2015: 141 (China); Kazanci & Türkmen 2016: 100 (Turkey); Salur et al. 2016: 82 (Turkey); Sroka et al. 2019: 102 (COI comparison). Oligoneuriella rhenana: Uéno 1941: 19 (male) (nec Oligoneuria rhenana Imhoff 1852: 177) (first record from China); Zhou 2013: 200 (list); Zhou et al. 2015: 250 (list) (Mis-identification). Distribution: China (Heilongjiang, Xinjiang); Middle East, Northern Palearctic of Asia, Europe. Description Nymph (in alcohol): body length 10.0–13.0 mm (female, Fig. 1A), 7.0–10.0 mm (male, Fig. 1B); cerci 3.5–4.0 mm, terminal filament 3.0– 3.5 mm (Figs 1A–B). Body generally yellowish brown to reddish brown, male usually slightly paler than female; head and thorax washed with dark brown markings and stripes; middle line and laterally expanded plate of terga without color, other place of terga brown but those pigments usually not on posterior margins of each terga; in addition, abdominal terga with two pale longitudinal sub-median lines on brown portion of terga, this making each tergum with four brown markings, each marking with pale dot, two median markings with dots in the middle, two lateral markings with dots at anterior corner, but those pale dots unclear on terga VII–X or VIII–X (Figs 1A–B). Caudal filaments pale to shallow gray (Figs 1A–B). Head: Capsule expanded anteriorly and laterally, female larger than male (Figs 2A–D); anterior margin of capsule with dense and long hair-like setae, orientated anteriorly (Figs 2A–D); vertex usually with three brown markings, two near posterior margin, one between two eyes (Figs 2A, 2C). Anterior half of mesal margin of compound eyes nearly straight, posterior half convex (Figs 2A, 2C). Outline of male eyes circular in dorsal view (Fig. 2A), oval in lateral view (Fig. 2B); shortest distance between two eyes slightly shorter than diameter of one eye, ratio nearly 1.0:1.1 (Fig. 2A); lateral margin of eye exceeding head margin in dorsal view (Fig. 2A). Mesal margin of female eyes convex (Fig. 2C), outline of eye long-oval in both dorsal and ventral view (Figs 2C–D); shortest distance between two eyes slightly larger than diameter of one eye, ratio of them near 1.2:1.0; lateral margin of eye not exceeding head margin in dorsal view (Fig. 2C). Antennae without color, pedicel nearly twice as long as scape in dorsal view; tiny hair-like setae on scape, pedicel and articulations of flagella (Figs 2A–D). Mouthparts: Both dorsal and ventral surfaces of labrum with dense and long hair-like setae, especially area near anterior margin except median portion, those setae on dorsal surface longer than ventral setae; anterolateral corner of labrum expanded greatly, making lateral margin almost straight but anterior margin convex; posterolateral corner sclerotized and dark (Fig. 3A). Two mandibles nearly same and symmetric, molar much stronger than incisor; both of them with hair-like setae at middle of outer margin (Figs 3D–E); outer and inner incisors with three teeth apically, apex of prostheca divided into a tuft of spines (Figs 3C–E). Crown of maxillae covered with long hair-like setae, besides mesal setal line, an additional setal line on ventral surface of galea-lacinia (Fig. 3G); maxillary palpi covered with dense yellowish hair-like setae, those setae on ventral surface much denser than dorsal ones, setae subequal in length; segment II of maxillary palpi crescent in shape, ca. 6.0x long about segment I (Fig. 3G). Gill tuft between maxillae and head with well developed filaments, longer than maxillae (Fig. 3G). Lingua and superlinguae of hypopharynx covered with hair-like setae too but those of superlinguae much longer and denser than others; lingua heart-shaped, superlinguae with concave lateral margin and extended inwards forming a lobe (Fig. 3B). Labium with greatly expanded paraglossae, completely covering labial palpi and glossae (Fig. 3H); two paraglossae hinged together at basal half; ventral surface of paraglossae with very tiny hair-like setae, its margins with spine-like or spur-like setae; dorsal surface of paraglossae with a heart-shaped chamber at base, other place covered with dense hair-like setae and those setae lining up forming regular setal lines (Fig. 3H). Glossae in chamber of paraglossae, surface with hair-like setae too (Fig. 3H). Segment II of maxillary palpi ca. 1.6x segment I in length (Figs 3F, 3H); both of them with a ridge on dorsal surface, making their cross-section triangular in shape (Fig. 3F); outer margin of segment I with hair-like setae (ca. 3.0x longer than others), inner margin with one or two similar setae (Fig. 3F); on its dorsal surface, some spine-like setae between ridge and inner margin (Figs 3F, 3H). Ventral surface of segment II with setal line, just like those of paraglossae; on dorsal surface, dense hair-like setae between ridge and inner margin, both ridge and outer margin with spine-like setae at basal half (Figs 3F, 3H). Thorax: nota with irregular brown markings, generally, lateral margins darker than other parts (Figs 1A–B); lateral margin of pronotum expanded slightly, forming anterolateral lobes and lateral plates (Figs 1A–B, 2A, 2C). Anterolateral corner of mesonotum expanded too, forming a very small lobe (Figs 2A, 2C). Thoracic pleura of three segments expanded into two distinct lobes (supracoxal projections, Figs 2A, 2C), dorsal plates of coxae expanded into lobes too, those lobes of prothorax smaller than others. Forelegs: surface and apical margin of coxae with spine-like setae; surface of trochanter smooth; inner margin of femora with a circle of long hair-like setae, dorsal surface and outer margin with spine-like setae, middle portion with more and denser setae than others; femora with a subapical dark dot in dorsal; ventral surface of femora with spine-like setae too but sparser than dorsal one. Tibiae with expanded and convex base, long hair-like setae almost on whole inner margin except apical portion, only spine-like setae on there; both dorsal and ventral surfaces of tibiae with a longitudinal line of spine-like setae, those dorsal setae positioned almost to proximal base of femora but leaving 1/5–1/6 portion empty, instead, several spine-like setae on outer margin here. Those setae on ventral surface almost to base of femora but several proximal ones near outer margin too; apex of tibiae forming a finger-like projection. Inner and apical margin of tarsi with spine-like setae; length ratio of femora: tibiae: tarsi=5.5: 7.5: 2.0 (Fig. 3E); claw with a hooked and deep reddish-brown apex and five denticles at base (Fig. 3I). Midlegs: all parts covered with spine-like setae but without any hair-like setae except one on inner margin of tarsi; setal pattern of femora similar to forefemora, setae near apex of tibiae and tarsi larger and stronger than others, claw with five denticles too; length ratio of femora: tibiae: tarsi =13.0:6.0:8.0 (Fig. 3F). Hindlegs: similar to hindlegs, length ratio of femora: tibiae: tarsi =10.5:4.0:6.0 (Figs 3G–H). Abdomen: terga and sterna covered with tiny scale-like setae, those setae on sterna concentrated and enlarged at median portion near posterior margin (Figs 1D, 2N); most of those setae with golden to reddish golden color, length subequal to width, but some of them longer than others, length at least 2x width, especially some sterna II and III (Fig. 2O). Posterolateral corners of terga expanded into sharp projections; those projections larger progressively from anterior to posterior; projections of tergum I distinct, projections of terga II–VII with convex outer margins, oriented outwards to body longitudinal axis, ca. 1/3 length of each segment; projection of tergum VIII with almost straight outer margin and parallel to body axis; projections of tergum IX oriented inwards slightly (Figs 1C–D). Gills I with long-oval shaped dorsal lamella and well-developed ventral fimbriate filaments, filaments distinctly longer than lamella; both lamella and filaments with purple pigments; lamella with a ventral chamber and its dorsal surface with tiny spine-like setae (Fig. 2J). Gills II–VII similar to each other although gills IV–V slightly larger than others; dorsal lamellae of them slightly shorter or subequal to ventral filaments, surfaces of lamellae with spine-like setae and circular outline (Figs 1C, 2K–M). Subanal plate with distinct U-shaped concave posterior margin, making it like with two sharp p
Authors: Chen, Jia-Yi, Bian, Xiao-Nuo, Zhou, Chang-Fa
Institution: Nanjing Normal University
Language: English
Subfield: Ocean Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6912106546
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