Chimarra sadayu Malicky 1993

Hu, Yan-Li, Tsring, Samten, Wang, Bei-Xin & Sun, Chang-Hai, 2020, Descriptions of larvae of three Philopotamidae species from China (Insecta, Trichoptera), Zootaxa 4731 (4), pp. 509-521: 510-513

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Chimarra sadayu Malicky 1993


Chimarra sadayu Malicky 1993 

( Figs 2View FIGURE 2 A–3E)

Description. Larvae (5th instar). Body length 8–10 mm (n = 5), membranous body in alcohol white with head and pronotum yellowish brown ( Fig. 2AView FIGURE 2).

Head. Head capsule yellowish brown, smooth; in dorsal view somewhat elongate-elliptical, length about 2 times width, with posterior margin rounded ( Fig. 2BView FIGURE 2); frontoclypeal apotome ( Fig. 2CView FIGURE 2) with anterior margin dark brown in colour, apex asymmetrically bilobed, left lobe with anterolateral margin equaling inner margin in length, while right lobe with anterolateral margin longer than inner margin ( Fig. 2CView FIGURE 2); setae no. 1 and setae no. 2 equal in length, setae no. 3 shortest; setae no. 4 located at anterolateral angle, each with length equal to distance between setae no. 1 and no. 4; setae no. 5 long, located anterior to tentorial pits. In lateral view ( Fig. 2DView FIGURE 2), head capsule subrectangular, smooth, with posterior margin notched and darkly spotted at notch; setae no. 13 situated on anterior half of head capsule. In ventral view head capsule subrectangular ( Fig. 2EView FIGURE 2), with posterior margin concave, paired setae no. 18 centrally located on each side; anterior ventral apotome triangular, with anterior margin slightly concave. Eyes ( Fig. 2A, 2B, 2DView FIGURE 2) oval, black, surrounded by faint yellow halo. Antennae ( Fig. 2HView FIGURE 2) unusual, located on small light areas just behind bases of mandibles, each supporting two long and thin clavate spines of equal length and three short setae. Labrum ( Fig. 2FView FIGURE 2) T-shaped, white, membranous; transverse distal portion rod-like, transparent, edged with dense setae, notched mesally, its anterolateral margins each having tuft of bristles curved anterad; stalk of labrum strong, lateral margins constricted at base. Mandibles ( Figs. 2GView FIGURE 2 1View FIGURE 1, 2G2View FIGURE 2) of same colour as head or slightly darker; each with outer margin arched, bearing two basolateral bristles; in dorsal view with broad projection 1/3 distance from base (more prominent on left mandible), with serration 3/4 distance from base, small tooth in subapical recess, apex acute. Maxillae each with cardo cup-like in ventral view ( Fig. 2HView FIGURE 2), outer apical angle with one long seta, inner apical angles acute and produced mesad; stipes membranous, with dark oblique elongate sclerite; palpifer large, subrectangular in ventral view, with anterior margin having one subapical seta; maxillary palp four-segmented, first and fourth segments subequal in length, shorter than second and third segments subequal in length. Galea ( Fig. 2HView FIGURE 2) triangular in ventral view, each with inner margin bearing 2 tufts of fine bristles sub-basally and subapically and with apex bearing three strong bristles.

Labium in ventral view ( Figs. 2E, 2HView FIGURE 2) with submentum trapezoidal, having one seta near each anterolateral angle; mentum not sclerotized, trapezoidal; labial part proper in lateral view ( Figs. 2A, 2DView FIGURE 2) tongue-like, with apex depressed, in ventral view ( Figs. 2E, 2HView FIGURE 2) elliptical, ventral rods each elongate-elliptical, palpifer arched, labial palpi each 2-segmented, first segment cylindrical, second one triangular.

Thorax. Pronotum ( Figs. 3A, 3BView FIGURE 3) yellow in colour, strongly sclerotized, in dorsal view subrectangular, longer than wide, with posterior margin black and notched mesally; anterior 1/3 with shallow transverse depression, posterior 1/5 with deep and broad transverse depression; posterior parts of lateral margins each with narrow black stripe just above its forecoxa, not connecting with aforementioned broad black posterior border ( Fig. 3BView FIGURE 3); each anterior angle with scattered setae of varied length, each lateral margin with 1 small seta just above its forecoxa, middle portion having three setae on each side with two pairs of anterior setae much longer than posterior pair.

Proepisternum elongate-triangular in lateral view, with lower and anterior margins black, anterior margin slightly concave; proepimeron triangular, yellow, with lower margin deeply concave. Foretrochantin ( Fig. 3BView FIGURE 3) slender, progressively enlarged from base to subapex, with distal 1/3 suddenly narrowed. Meso- and metanota ( Fig. 2AView FIGURE 2) unsclerotized, white in colour; meso- and metaepisternum somewhat triangular, mes- and metepimera semicircular.

Legs. Legs ( Fig. 3C1–3C3, 3DView FIGURE 3View FIGURE 1View FIGURE 2) yellowish brown and sclerotized, with few scattered bristles on coxae, femora, and tibiae. Forelegs strongest, hind legs smallest. Forecoxae cylindrical ( Fig. 3CView FIGURE 3 1View FIGURE 1), each with apex obliquely truncate, sclerotized seta-bearing process tubular, tapering from base to apex, slightly curved laterad, with subapex having one small hair dorsally; trochanter 2-segmented, first segment trapezoidal, second one triangular; femur with base obliquely truncate in lateral view, progressively enlarged from base to apex; tibia cylindrical, about half as long as femur; tarsus slender, slightly longer than tibia, tapering from base to apex, with row of short spine-like setae ventrally ( Fig. 3DView FIGURE 3); claw small but well developed, slightly curved downwards and with conspicuous basal seta-bearing process. Mid- and hind legs similar to forelegs in overall morphology, but their coxae slightly longer than in forelegs, and lacking seta-bearing processes; femora, tibiae and tarsi slightly shorter than in forelegs, tarsi each without ventral row of spine-like setae.

Abdomen. Abdominal segments I–IX white, with sparse short setae on each surface. No lateral fringe present; segment IX in dorsal view with posterior margin concave, with 5 single apicodorsal anal papillae ( Fig. 2AView FIGURE 2). Anal prolegs ( Fig. 3EView FIGURE 3) unsclerotized basally, sclerotized distally; anal claws in lateral viewe each with base strong and sharp, apices curved downwards at 90 degrees, each with dorsal margin having 3 small basodorsal setae.

Materials examined. CHINA, Zhe -jiang  Province, Lin -an, Tianmu Mountains: 1 larva, Xi-shan-wu, 30.2797°N, 119.4922°E, Alt. 219.3 m, 10 Oct 2017GoogleMaps  ; 3 larvae, Che-shui-wu, 30.3558°N, 119.4522°E, Alt. 503.9 m; Hu -zhou, An -ji County: 5 larvae, Dong-wu-cun, 30.4656°N, 119.5781°E, Alt. 348.7 m, 13 Oct 2017.10 Oct 2017GoogleMaps  ; 1 larva, Shui-wu-li, 30.3550°N, 119.5958°E, Alt. 230 m, 12 Oct 2017GoogleMaps  ; collected by Yan-li Hu, Yu Wang & Lang Peng. Jin -hua, Pujiang County: 2 larvae, Tai-tou-wan, 29.4561°N, 119.7517°E, Alt. 137 m, 30 Aug 2017GoogleMaps  , collected by Lei Zhang and Cong Wu. Long-quan: 17 larvae, 28.1596°N, 118.8527°E, Alt. 484.96 m, collected by Yan-li Hu, Cong Wu and Jin Gao.GoogleMaps  Ning -bo, Yu -yao county, Siming Mountain National Forest Park: 2 males, Shen-hu , 29.7271°N, 121.0776°E, Alt. 851.94 m, 2 Aug 2016GoogleMaps  , collected by Ji-hua Xu.

Distribution. China (Zhejiang, Fujian).