Cinygmula irina Tshernova & Belov, 1982

Tiunova, Tatiana M. & Gorovaya, Ekaterina A., 2013, New species of Cinygmula McDunnough, 1933 and larval description of Cinygmula irina Tshernova & Belov, 1982 from the Russian Far East (Ephemeroptera: Heptageniidae), Zootaxa 3691 (1), pp. 135-144 : 140-143

publication ID

https://doi.org/ 10.11646/zootaxa.3691.1.4

publication LSID

lsid:zoobank.org:pub:DB99C47C-EF72-4359-9803-DDCB17C4C4E1

DOI

https://doi.org/10.5281/zenodo.6160841

persistent identifier

https://treatment.plazi.org/id/03D9D556-FFC8-2036-FF7A-C0C5FBC2F830

treatment provided by

Plazi

scientific name

Cinygmula irina Tshernova & Belov, 1982
status

 

Cinygmula irina Tshernova & Belov, 1982 View in CoL

( Figs. 30–55 View FIGURES 30 – 37 View FIGURES 38 – 52 View FIGURES 53 – 55 )

Material examined. Russia: Khabarovskiy Kray, Ayano-Maisky region, Sarafanovka River, Ayan village, 2.VIII.1999, T. Tiunova, 5 male, 3 female imagines (reared from larvae), 20 mature larvae; Berandya River, upper part, 4.VIII.1999, T. Tiunova, 9 male, 2 female imagines (reared), 2 male, 1 female subimagines, 14 larvae; Anikei Stream, 0.5 km from Lantarsky cape, 28.VII.1999, T.Tiunova, 1 male imago (reared); Komsomolsky region, Silinka River, upper part, left tributary of Amur River, 8.IX.2003, V. Luborez, 6 male, 4 female imagines, 19 larvae.

Description. Male imago (in alcohol). Length (mm): body 7.0–8.2; forewings 8.7–9.4; cerci 15.6–18.0. Head: eyes non-contiguous ( Fig. 30 View FIGURES 30 – 37 ), black tinged greenish. Thorax: Medioscutum and submedioscutum light brown but submedioscutum lighter; anteronotal protuberance brown; medial longitudinal suture narrow and brown. Scutellum duty brown; scuto-scutellar impression duty dark. Foreleg duty yellowish, joint brown; femur and tibia middle and hind legs yellowish, joint darker; tarsus brownish.

Length (mm) of foreleg segments: femora 2.0–2.1; tibia 2.6–3.1; tarsal segments 0.9–1.1, 1.2–1.6, 1.2–1.5, 0.9–1.1, and 0.4–0.5. Wings hyaline, all veins brown ( Figs. 31–32 View FIGURES 30 – 37 ). Pterostigma unpigmented, branched veins few ( Fig. 31 View FIGURES 30 – 37 ). Abdomen: terga without maculation; tergum I brown; terga II–VI brownish, translucent, lateral corner near posterior margin duty brown; terga VII–IX brown. Sterna brownish, translucent; sterna I-VII with ganglionic markings; sterna VIII–IX light brown. Styliger light brown; gonostyli brown and three-segmented ( Fig. 33 View FIGURES 30 – 37 ); sometimes first and second segments of gonostylus darker than other. Penes lobes light brown, lateral margin brown; tops dark brown, widely separated, with deep groove at apical margin ( Figs. 34–35 View FIGURES 30 – 37 ); penis lobes with long lateral spine; spine wide at base, strongly narrowing to top, with pointed tips ( Figs. 34, 36 View FIGURES 30 – 37 ). Titillators long and strong with pointed tips, almost reaching top, curved laterally ( Figs. 34, 36 View FIGURES 30 – 37 ). Cerci light brown, some darker at base.

Female imago. Length (mm): body 7.2–8.0; forewings 8.4–9.0; cerci 11.0–12.0. Overall color brown. Thorax: Mesonotum brown. Sublateroscutum and scuto-scutellar impression white. All legs light brown, tarsus brown. Length (mm) of foreleg segments: femora 1.7–2.0; tibia 1.9–2.2; tarsal 1.1–1.3. Wings hyaline; all veins brown, contrasting. Abdomen: terga dark brown. Sterna brown (abdomen with eggs), or duty brown, translucent (without eggs). Subanal plate with relatively deep depression ( Fig. 37 View FIGURES 30 – 37 ). Cerci brownish, darker at base.

Mature larva. Length (mm): body 6.5–8.5; cerci 6.5–7.5. Head: brown, with somewhat darker anterior margin and shallow apical incision ( Fig. 38 View FIGURES 38 – 52 ). Labrum light brown, posterior and lateral margins brown; width 3 times as long ( Fig. 39 View FIGURES 38 – 52 ). Glossae wide with rounded tops ( Figs. 40–41 View FIGURES 38 – 52 ). Thorax: pronotum light brown with pair of pale spots at anterior margin and light outer edges. Mesonotum brown; antero lateral corners with light spots. Legs light brown, tarsus brown; femur of forelegs with oval pale longitudinal stripe; strong brown setae cover dorsal surface of femur, located especially in light area ( Fig. 43 View FIGURES 38 – 52 ). Claws of foreleg with four subapical denticles ( Fig. 44 View FIGURES 38 – 52 ). Lengths (mm) of leg segments as follows. Foreleg: 1.5–1.8; tibia 1.5–1.8; and tarsus 0.7–0.8. Middle leg: femur 1.7–2.0; tibia 1.4–1.7; and tarsus 0.6. Hind leg: femur 1.8–2.1; tibia 1.5–1.8; and tarsus 0.6–0.7. Abdomen: terga brown or light brown with pale lateral sides; terga I–VIII with pair brown curved strokes in middle area and dark stripes on sides; terga I–III lighter than others; sometimes tergum VII–VIII white with brown anterior margin and lateral sides ( Fig. 45 View FIGURES 38 – 52 ). Sterna brown with pale lateral sides; sterna I–II white; sterna III–IX each with pair of light drop-like spots at anterior margin, and pair of brown spots at posterior margin ( Fig. 46 View FIGURES 38 – 52 ); abdominal sternum IX with relatively deep posteromedian emargination ( Fig. 47 View FIGURES 38 – 52 ). Gills white. Gill I large, heart-shaped, with extended inner edge, width almost equal to length; two short gill filaments ( Fig. 48 View FIGURES 38 – 52 ). Gills II, III and IV with similar shape and size ( Fig. 49 View FIGURES 38 – 52 ). Gill V with drawn and pointed tip ( Fig. 50 View FIGURES 38 – 52 ). Gill VI oval, with short gill filament ( Fig. 51 View FIGURES 38 – 52 ). Gill VII narrow and uniformly tapered to rounded tip ( Fig. 52 View FIGURES 38 – 52 ), length 2.3 times width. Cerci brown.

Eggs. General form cylindrical, with length of 138–163 μm and width of 99–114 μm ( Fig. 53 View FIGURES 53 – 55 ). Surface of chorion rough, with clear granular structures ( Fig. 54 View FIGURES 53 – 55 ).

Numerous small round granules and small KCT (knob-terminated coiled thread) attachment structures evenly spaced over whole surface ( Figs. 53–54 View FIGURES 53 – 55 ); large and round knobs arranged on one pole ( Fig. 53, 55 View FIGURES 53 – 55 ). Two round micropiles located in equatorial area; sperm guide round; micropylar rim well-expressed ( Fig. 53 View FIGURES 53 – 55 ).

Distribution and biology. Cinygmula irina is an East Asian species that is distributed in the Russian Far East: Primorskiy Kray, Khabarovskiy Kray and Amurskaya oblast’ (Tshernova & Belov 1982; Tiunova 2007, 2009).

The larvae of this species are associated with stones, gravel and pebbles in small rivers or streams, which can be characterized as rivers of cold and moderately cold types. Emergence occurs in late July and August. Discussion. Only the male and female adult forms of Cinygmula irina have been described previously, and the larva was unknown (Tshernova & Belov 1982). The presence of reared material allowed the description of all the stages of development for Cinygmula irina . Here, we presented a description of the eggs of both species, which, based on our data, are useful for the diagnosis of species within the genus Cinygmula .

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