Heptagenioidea

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Chirotenetes siccus Walsh. Female subimago 66; Sketch of tails of male subimago to show their relative length 67; Female imago 68; Sketch of tails of male imago to show their relative length 69; legs of one side of male imago 70; End of abdomen of adult male from beneath 71; Nymph from the side. Note the plancton-gathering fringes of the fore legs 72; Tail fin of the nymph; outer tails fringed only on the inner side 73

Figure 1.A Habitus of Epeorus aculeatus Braasch, 1990 B lamellae of gills 7 of Epeorus khayengensis Boonsoong & Braasch, 2010 C–E ventral view of abdomen (C), abdominal gills 1 (D) and abdominal terga of (E) Epeorus thailandensis sp. n. F abdominal terga of Epeorus unicornutus Braasch, 2006 G abdominal terga of Epeorus khayengensis Boonsoong & Braasch, 2010 H–J abdominal terga (H), lamellae of gills 1 (I) and tergum VII (J) of Epeorus inthanonensis Braasch & Boonsoong, 2010.

Figures 1–3.Thalerosphyrus determinatus (Walker, 1853). 1 Habitus in dorsal view 2 Habitus in ventral view 3 Detail of abdominal segments VI–IX in ventral view.

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Figure 5.A–B General outline (A) and micropyle (B) of the egg of Epeorus khayengensis Boonsoong & Braasch, 2010 C-D General outline (C) and micropyle (D) of the egg of Rhithrogena siamensis Braasch & Boonsoong, 2009. Scale bars 20 µm for A and C; 5 µm for B and D.

Figures 4–6.Thalerosphyrus sinuosus (Navás, 1933). 4 Habitus in dorsal view 5 Habitus in ventral view 6 Detail of abdominal segments VI–IX in ventral view.

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Figure 9.A Habitus of Asionurus namnaoensis Braasch & Boonsoong, 2010 B habitus of Asionurus primus Braasch & Soldán, 1986 Chabitus of Compsoneuria thienemanniUlmer, 1939 Dhabitus of Epeorus khayengensis Boonsoong & Braasch, 2010 E habitus of Rhithrogena tonkinensis Soldán & Braasch, 1986 F habitus of Thalerosphyrus sinuosus Navás, 1933.

Figures 7–9.Thalerosphyrus lamuriensis Sartori, 2014. 7 Habitus in dorsal view 8 Habitus in ventral view 9 Detail of abdominal segments VI–IX in ventral view.

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Figure 2.A Ventral view of abdomen of Rhithrogena siamensis Braasch & Boonsoong, 2009 B–E lamellae of gills 1 (B), 3 (C), 5 (D) and 7 (E) of Trichogenia maxillaris Braasch & Soldán, 1988 F ventral view of left maxilla of Trichogenia maxillaris Braasch & Soldán, 1988 G bristles on dorsal face of abdominal terga of Trichogenia maxillaris Braasch & Soldán, 1988 H ventral view of left maxilla of Compsoneuria langensis Braasch & Boonsoong, 2010 I-J abdominal terga (I) and tergum VII (J) of Notacanthurus baei Braasch & Boonsoong, 2009.

Figures 16–22.Mouthparts structure of Thalerosphyrus determinatus (20), Thalerosphyrus sinuosus (16, 21) and Thalerosphyrus lamuriensis (17, 18, 19, 22). 16–17 Hemi-labrum 18 Left mandible 19 Right mandible 20–22 Labial glossa.

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Figure 5.A–B General outline (A) and micropyle (B) of the egg of Epeorus khayengensis Boonsoong & Braasch, 2010 C-D General outline (C) and micropyle (D) of the egg of Rhithrogena siamensis Braasch & Boonsoong, 2009. Scale bars 20 µm for A and C; 5 µm for B and D.

Figures 23–26.SEM (23, 25, 26) and optic (24) pictures of maxillar structure. 23–24 Dentisetae of Thalerosphyrus lamuriensis dp: proximal dentisetae, dd distal dentisetae 25 Scattered setae on the ventral face of the galea-lacinia of Thalerosphyrus sinuosus 26 Comb-shape setae on the crown of the galea-lacinia of Thalerosphyrus sinuosus.

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Figure 2.A Ventral view of abdomen of Rhithrogena siamensis Braasch & Boonsoong, 2009 B–E lamellae of gills 1 (B), 3 (C), 5 (D) and 7 (E) of Trichogenia maxillaris Braasch & Soldán, 1988 F ventral view of left maxilla of Trichogenia maxillaris Braasch & Soldán, 1988 G bristles on dorsal face of abdominal terga of Trichogenia maxillaris Braasch & Soldán, 1988 H ventral view of left maxilla of Compsoneuria langensis Braasch & Boonsoong, 2010 I-J abdominal terga (I) and tergum VII (J) of Notacanthurus baei Braasch & Boonsoong, 2009.

Figures 27–34.Mouthpart (27–28) and thoracic (29–34) structures of Thalerosphyrus determinatus (27, 29, 30), Thalerosphyrus sinuosus (31, 32) and Thalerosphyrus lamuriensis (28, 33, 34). 27–28 Apex of superlingua of hypopharynx 29, 31, 33 Bristles on the dorsal face of hind femur 30, 32, 34 Outer margin of hind tibia.

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Figure 2.A Ventral view of abdomen of Rhithrogena siamensis Braasch & Boonsoong, 2009 B–E lamellae of gills 1 (B), 3 (C), 5 (D) and 7 (E) of Trichogenia maxillaris Braasch & Soldán, 1988 F ventral view of left maxilla of Trichogenia maxillaris Braasch & Soldán, 1988 G bristles on dorsal face of abdominal terga of Trichogenia maxillaris Braasch & Soldán, 1988 H ventral view of left maxilla of Compsoneuria langensis Braasch & Boonsoong, 2010 I-J abdominal terga (I) and tergum VII (J) of Notacanthurus baei Braasch & Boonsoong, 2009.

Figures 35–37.Posterior margin of abdominal tergite IV. 35 Thalerosphyrus determinatus 36 Thalerosphyrus sinuosus 37 Thalerosphyrus lamuriensis.

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Figure 2.A Ventral view of abdomen of Rhithrogena siamensis Braasch & Boonsoong, 2009 B–E lamellae of gills 1 (B), 3 (C), 5 (D) and 7 (E) of Trichogenia maxillaris Braasch & Soldán, 1988 F ventral view of left maxilla of Trichogenia maxillaris Braasch & Soldán, 1988 G bristles on dorsal face of abdominal terga of Trichogenia maxillaris Braasch & Soldán, 1988 H ventral view of left maxilla of Compsoneuria langensis Braasch & Boonsoong, 2010 I-J abdominal terga (I) and tergum VII (J) of Notacanthurus baei Braasch & Boonsoong, 2009.