Hydropsyche napaea Mey 1996

Prommi, Taeng On, 2016, Descriptions of larvae of four species of Hydropsyche (Hydropsychidae: Trichoptera) from Thailand, Zootaxa 4158 (4), pp. 577-591 : 586-589

Hydropsyche napaea Mey 1996

( Figs. 28—34 )

Larva: Total length 16.0— 16.5 mm (n = 10). Overall, body shape as usual in Hydropsychidae ( Fig. 28 ). Head and notal sclerites brown to dark brown.

Head: Head capsule length, 1.22—1.26 mm; width, 1.20—1.22 mm. Dorsum of head dark brown with yellow stripe on midline ( Fig. 29 ). Areas around eyes light brown, muscle scars below eyes ( Fig. 29 ). Dorsal and lateral portions of head covered with long, black, truncate peg setae and with tapered setae in anterior 3/4ths ( Fig. 29 ). Frontoclypeus with anterior margin strongly convex medially, with yellow stripe on midline ( Fig. 29 ). Frontoclypeus covered uniformly with truncate peg setae and tapered setae. Ventral surface of head brownish, posterolaterally with group of muscle scars ( Fig. 30 ). Labrum brown; apically rounded in dorsal view; bearing well-developed, golden brown, pectinate, lateral setae and long, stout, dark, dorsal setae ( Fig. 31 ). Mandibles dark brown, asymmetrical: left mandible with 2 apical teeth and 3 mesal teeth, right mandible with 2 apical teeth and 3 mesal teeth and with deep excision between middle and basal mesal teeth, outer surfaces of both mandibles with scattered setae ( Fig. 32 ). Submentum brown, with deep anteromesal cleft, anterior margins on either side of cleft with long setae ( Fig. 30 ). Anterior ventral apotome broadly triangular; posterior ventral apotome small, oval ( Fig. 30 ).

Thorax: Nota dark brown ( Fig. 33 ) covered with setae similar to those on dorsum of head. Prosternite brown, transverse, narrow, with dark band centrally; with pair of large, posterolateral sclerites ( Fig. 35 ). Foretrochantin deeply forked ( Figs. 28 , 34 A). Forelegs stouter than other legs, each with femur widened dorsally in middle and with long setae on ventral margin ( Fig. 34 A). Mid- and hind legs similar in size, shape, and structure; with dense setae on mesal surfaces of coxae through tarsi ( Figs. 34 A, 34B). Mesosternum with one pair of single-stemmed gills and metasternum with 2 pairs of single-stemmed gills; gills each bearing approximately 58 lateral filaments.

Abdomen: Abdominal segments with dense brown, scale hair setae in various sizes ( Fig. 28 ). Sternum I 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. 28 ). Sternum VIII with pair of small, triangular sclerites bearing spike-like setae. Sternum IX with pair of large, triangular sclerites. Tergum IX with small lateral sclerites ( Fig. 36 ) and pair of large dorsal sclerites. Anal prolegs each with bent claw, spike-like setae present on dorsal and ventral surfaces ( Fig. 36 ).

Material examined: THAILAND: KANCHANABURI Prov.: Huai U-Long, 191 m. 14°47.126' N, 098°40.589' E, 12- iv-2015, 10 larvae, 2 male pupae, 2 male adults, leg. Prommi ; CHIANG MAI Prov.: Huai Sai Lueng waterfall, 1060 m. 18°31' N, 098°27' E, 2- xii-2002, 5 larvae, 1 male adult, leg. Thamsenanupap ; same locality, 2- ii-2003, 6 larvae, 1 male pupae, 8 male adults, leg. Thamsenanupap ; same locality, 2- iv-2003, 10 larvae, 1 male adult, leg. Thamsenanupap; Mae Pan stream, 750 m. 18°31' N, 098°25' E, 31 - i-2002, 3 larvae, 1 male adult, leg. Thamsenanupap; same locality, 12- viii-2002, 16 larvae, 2 male pupae, 13 male adults, leg. Thamsenanupap ; same locality, 15- xi-2002, 12 larvae, 2 male pupae, 17 male adults, leg. Thamsenanupap ; same locality, 22- ii-2003, 8 larvae, 13 male adults, leg. Thamsenanupap ; same locality, 1- iv-2003, 18 larvae, 3 male pupae, 9 male adults, leg. Thamsenanupap .

Figures

FIGURES 28 ― 32. Larva of Hydropsyche napaea Mey 1996: 28, larval habitus, right lateral; 29, head, dorsal; 30, head, ventral; 31, labrum, dorsal; 32, mandibles, ventral.

FIGURES 33 ― 36. Larva of Hydropsyche napaea Malicky & Chantaramonngkol 2000: 33 A, pronotum, dorsal; 33 B, mesonotum, dorsal; 33 C, metanotum, dorsal; 34 A, right pleuron, foretrochantin (arrow), and foreleg, right posterolateral; 34 B, right midleg, right posterolateral; 34 C, right hind leg, right posterolateral; 35, prosternum, ventral; 36, Sterna VIII and IX and anal prolegs, ventral.