Hydropsyche camillus Malicky & Chantaramongkol 2000

Prommi, Taeng On, 2016, Descriptions of larvae of four species of Hydropsyche (Hydropsychidae: Trichoptera) from Thailand, Zootaxa 4158 (4), pp. 577-591 : 581-586

Hydropsyche camillus Malicky & Chantaramongkol 2000

( Figs. 19—27 )

Larva: Total length 10.0—11.0 mm (n = 10). Overall body shape as usual in Hydropsychidae ( Fig. 19 ). Head yellow to dark brown, with dark muscle scars in posterior 1/5th. Nota light brown, each with posterolateral muscle scars.

Head: Head capsule length 1.02—1.05 mm; width, 0.85—0.94 mm. Dorsum of head dark brown, with two or three distinct yellow marks on frontoclypeus: T-shaped mark anteriorly and circular mark posteriorly or transverse band anteriorly, small spot in middle, and circular mark posteriorly ( Fig. 20 ). Frontoclypeus with anterior margin strongly convex, with setae #1, #2, and #3 extending beyond anterior margin ( Fig. 20 ). Head with moderately long, erect, truncate peg setae; with tapered setae on dorsal and lateral regions of anterior 3/4ths. Frontoclypeus with few setae or no brush of setae; with truncate peg setae anterolaterally ( Fig. 20 ). Head ventrally dark-brown with stridulatory lines in anterior 3/4ths ( Fig. 21 ). Labrum light-brown; elliptical in dorsal view; bearing welldeveloped, lateral, golden-yellow pectinate setae and stout setae on dorsal surface ( Fig. 22 ). Mandibles darkbrown, right mandible with 2 apical and 2 mesal teeth, left mandible with 2 apical and 3 mesal teeth and welldeveloped mesal setal brush ( Fig. 23 ). Submentum light-brown, with deep anteromesal cleft, anterior margins on either side of cleft with long setae. Anterior ventral apotome broadly triangular, posterior ventral apotome small, triangular ( Fig. 21 ).

Thorax: Nota brown with darker muscle scars laterally. Pronotum with numerous, erect, truncate peg setae and long, tapered setae ( Fig. 25 A). Meso- and metanota with numerous scale hairs and with scattered truncate peg setae ( Figs. 25 B, 25C). Prosternite brown, transverse, narrow, with broad dark transverse band along posterior margin and pair of fine dark transverse bands anterolaterally; with pair of large posterolateral sclerites brown on mesal 2/3rds and pale laterally ( Fig. 24 ). Foretrochantin deeply forked ( Fig. 26 A). Forelegs each with numerous feather-like setae on posterior surface of coxa; trochanter with long, feather-like setae on ventral margin; femur with row of long, dark, spike-like setae, mingled with feather-like setae on ventral margin and few, short, dark, setae on external surface ( Fig. 26 A). Mid- and hind legs similar in size, shape, and structure, each with feather-like setae on posterior surface of femur ( Fig. 26 B, 26C). Mesosternum with one pair of single-stemmed gills and metasternum with 2 pairs of single-stemmed gills; gills each bearing approximately 22 lateral filaments.

Abdomen: Abdominal segments densely covered with dark, club-like hairs ( Fig. 19 ). 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 each arising from common base ( Fig. 19 ). Sternum VIII with pair of small, triangular sclerites bearing spike-like setae. Sternum IX with pair of large, triangular sclerites bearing spike-like setae emanating from prominent sockets. Tergum IX with small lateral sclerites ( Fig. 27 ) and pair of large dorsal sclerites. Anal prolegs each with bent claw and cluster of long bristles, spike-like setae present on dorsal and ventral surfaces ( Fig. 27 ).

Material examined: THAILAND: KANCHANABURI Prov.: Huai Kayeng , 244 m . 14°36.224' N, 098°34.822' E, 6-xii-2014, 126 larvae, 8 male pupae, 27 male adults; Huai Lin Thin, 116 m. 14°34.445' N, 098°50.039' E, 8-xii-2014, 9 larvae, 4 pupae; Huai Pakkok, 246 m. 14°39.518' N, 098°32.237' E, 12-iv-2015, 195 larvae, 16 male pupae; Huai U-Long, 191 m. 14°47.126 N, 098°40.589' E, 12-iv-2015, 92 larvae, 6 male pupae, 12 male adults. All material leg. Prommi.

Figures

FIGURES 19 ― 24. Larva of Hydropsyche camillus Malicky & Chantaramongkol 2000: 19, larval habitus, right lateral; 20, head, dorsal; 21, head, ventral; 22, labrum, dorsal; 23, mandibles, ventral; 24, prosternum, ventral.

FIGURES 25 ― 27. Larva of Hydropsyche camillus Malicky & Chantaramoongkol 2000: 25 A, pronotum, dorsal; 25 B, mesonotum, dorsal; 25 C, metanotum, dorsal; 26 A, right pleuron, foretrochantin (arrow), and foreleg, right posterolateral; 26 B, right midleg, right posterolateral; 26 C, right hind leg, right posterolateral; 27, sterna VIII and IX and anal proleegs, ventral.