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9. Genus Trichostegia Kolenati (Na nn ophr y ga n ea 

 Martynov) 



Pull -grown larva. Length 15 — 18 mm. Dorsal side of head mainly dark. 

 Brush present in median depression of right and left mandible. 



Fore tibiae with ventral comb of small spinules. Dorsal process on 

 abdominal segment 1 absent. 



Case straight, smooth, made of plant fragments, sometimes with mineral 

 particles as well, arranged in rings or irregularly. 



Pupa. Length 10— 13 mm. Mandibles long, with well developed, slightly 

 curved apex. Mid -tarsi with a few natatorial setae. Anal appendages 

 with large median process. 



Case as in the larva, 22— 2 3rrxm long. 



Mode of life and habitats. Small, stagnant water bodies. 



Distribution. Northern, central, and western parts of European USSR. 

 In addition. Northern, Central, and Western Europe. 



1. Trichostegia minor Curtis * 



Kolenati, 1848:87.- Hagen, 1864:240; 1873:440. - Wallengren, 1891 :26. 

 Struck, 1900:8, Figure 5.- Siltala, 1902:22-26, Figure 5.- Struck, 1903: 

 44-53, Plate I, Figure 2; Plate V, Figures 1-8.- Ulmer, 1903:37-38.- 

 Siltala, 1904c: 16, 26-27.- Ulmer, 1909:239, 302, Figures 366,441 a. - 

 Lestage, 1921 :555-558, 580-591.- Hickin, 1954:174-176, Figures 1-7. 



Full-grown larva. Length 15— 18mm (Figure 99). Ground color of 

 sclerites yellowish; pattern blackish brown. Dark median pattern of 

 frontoclypeus occupying nearly the whole sclerite except the posterior 

 angle (Figure lOO); anterior angles less dark than the other surface. 

 Dorsal stripes wide, dark; lateral stripes lighter, large dots on and 

 between stripes. Ventral surface dark, except a narrow stripe near 

 61 occipital foramen (Figure 101 ). Large dark spots on the stripes near 

 setae 9, 14, 15, and 17. 



Labrum short, wide. Left mandible with 3 teeth on dorsal blade and 2 

 on ventral blade; right mandible with 2 teeth on each blade; basal tooth 

 large; both mandibles with a brush of short chaetoids in basal part of 

 median depression. 



Pronotum (Figure 99) dark brown, lighter at anterior margin, with dark 

 transverse stripe, groups of dots in each half of tergite posteriorly. 



Legs brown. All coxae ventrally and subventrally with small covering 

 chaetae; in contrast to other genera, fore tibia with a comb of small, light 

 spinules, like mid- and hind tibiae; claws of fore- and midlegs as long 

 as tarsi; claw of forelegs with blunt basal spine, claws of mid- and hind 

 legs with sharp basal spine. 



Dorsal process of abdominal segment 1 absent, replaced by a small 

 tubercle; lateral processes large, well developed. Small setae of lateral 

 line dark. Gills on segments 1—7 (ventral); segment 8 only with ventral 

 presegmental gills. 



* The species appears in the literature as Phryganea minor Curt., N annophryg an ea 

 minor Curt. (Fischer, 1964:167— 174). 



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