Hydropsyche dolosa Banks 1939

Prommi, Taeng On, 2016, Descriptions of larvae of four species of Hydropsyche (Hydropsychidae: Trichoptera) from Thailand, Zootaxa 4158 (4), pp. 577-591: 578

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Hydropsyche dolosa Banks 1939


Hydropsyche dolosa Banks 1939 

( Figs. 1–9View FIGURES 1 ― 6View FIGURES 7 ― 9)

Larva: Total length 13.0–14.0 mm (n = 10). Overall body shape as usual in Hydropsychidae  ( Fig. 1View FIGURES 1 ― 6). Head darkbrown with yellow stripe on midline appearing to be continuation of longitudinal stripe on thoracic plates.

Head: Head capsule length 1.19–1.33 mm; width, 1.02–1.05 mm (n = 10). Dorsum of head light-brown with yellow stripe on midline wider anteriorly ( Fig. 2View FIGURES 1 ― 6). Lateral portion of head with yellow band connecting yellow areas around eyes reaching toward back of head; light-brown muscle scars posteriorly near posterior areas of head. Frontoclypeus with anterior margin slightly concave, with pairs of setae #1, #2, and #3 extending beyond anterior margin ( Fig. 2View FIGURES 1 ― 6). Head ventrally with transverse stridulatory lines on either side of ventral midline, extending about 2/3rds of length of head capsule; light brown region lateral of stridulatory lines surrounded by yellow ( Fig. 3View FIGURES 1 ― 6). Labrum light brown, slightly convex posteriorly; bearing well-developed, lateral, golden brown, pectinate setae and stout setae on dorsal surface ( Fig. 4View FIGURES 1 ― 6). Mandibles golden brown, asymmetrical, right mandible with 1 apical and 3 mesal teeth, left mandible with 2 apical and 3 mesal teeth and with mesal tuft of hairs; lateral surfaces of mandibles with scattered, long, setae ( Fig. 5View FIGURES 1 ― 6). Submentum with shallow median cleft; maxillae with long, black setae and stout setae laterobasally ( Fig. 3View FIGURES 1 ― 6). Anterior ventral apotome broadly triangular, posterior ventral apotome minute, triangular ( Fig. 3View FIGURES 1 ― 6).

Thorax: Nota brown with very conspicuous yellow stripe on midline appearing to be continuation of longitudinal stripe on head. Nota covered with long, dark and clear, erect, truncate peg setae, intermixed with tapered setae on surface and anterior margin of each notum ( Fig. 7View FIGURES 7 ― 9). Prosternite light-brown, transverse, narrow, with broad dark band posteromesally; with pair of large, light brown, posterolateral sclerites ( Fig. 6View FIGURES 1 ― 6). Foretrochantin deeply forked ( Fig. 1View FIGURES 1 ― 6). Forelegs with feather-like setae on posterior surfaces of coxae; trochanters and femora with long feather-like setae on ventral surfaces and with long setae; tibiae and tarsi with stout setae ( Fig. 8View FIGURES 7 ― 9 A). Mid- and hind legs similar in size, shape, and structure; with stout setae on posterior surfaces of femora; tibiae and tarsi with scattered setae in ventral margins ( Figs. 8View FIGURES 7 ― 9 B, 8C). Mesosternum with one pair of singlestemmed gills and metasternum with 2 pairs of single-stemmed gills; gills bearing approximately 50 lateral filaments.

Abdomen: Abdominal segments densely covered with dark, hair-like setae and club-like hairs ( Fig. 1View FIGURES 1 ― 6). First sternum with 2 pairs of bifid-stemmed gills. Segments II–V each with one pair of median gills. Segments II–VII each with one pair of lateral gills arising from common base ( Fig. 1View FIGURES 1 ― 6). Sternum VIII with pair of half-moon sclerites ( Fig. 9View FIGURES 7 ― 9). Sternum IX with pair of spine-bearing plates, with spines emanating from prominent sockets. Tergum IX with small lateral sclerites ( Fig. 9View FIGURES 7 ― 9) and pair of large dorsal sclerites. Anal prolegs each with bent claw and cluster of long bristles, without spike-like setae on ventral surface.

Material examined. THAILAND: RATCHABURI Prov.: Huai Nueng stream from Phachi watershed , 140 m  . 13°32.135'N, 099°17.842'E, 26-x-2013, Prommi, 80 larvae, 10 pupae, 5 male pupae, 5 male adults; Huai See stream from Phachi watershed , 170 mGoogleMaps  . 13°34.078'N, 099°15.495'E, 4-xii-2013, Prommi, 27 larvae, 5 male adults; Huai Phark from Phachi watershed , 183 mGoogleMaps  . 13°30.241'N, 099°15.889'E, 5-xii-2013, Prommi, 10 larvae, 3 pupae; Phachi Nueng stream from Phachi watershed , 160 mGoogleMaps  . 13°48.379'N, 099°19.152'E, 5-xii-2013, Prommi, 40 larvae, 6 male pupae, 5 male adults; Phachi Song stream from Phachi watershed , 155 mGoogleMaps  . 13°31.017'N, 099°27.449'E, 5-xii- 2013, Prommi, 32 larvae; Phachi Sarm stream from Phachi watershed , 123 mGoogleMaps  . 13°34.275'N, 099°21.778'E, 5-xii- 2013, Prommi, 42 larvae, 3 male pupae, 2 male adults; KANCHANABURI Prov.: Huai Kayeng , 244 mGoogleMaps  . 14°36.224'N, 098°34.822'E, 6-xii-2014, Prommi, 43 larvae, 8 male pupae, 7 male adults; Huai Lin Thin , 116 mGoogleMaps  . 14°34.445'N, 098°50.039'E, 8-xii-2014, Prommi , 9 larvae, 1 male pupa.GoogleMaps