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 2 View 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. 2A View FIGURE 2 ).

Head. Head capsule yellowish brown, smooth; in dorsal view somewhat elongate-elliptical, length about 2 times width, with posterior margin rounded ( Fig. 2B View FIGURE 2 ); frontoclypeal apotome ( Fig. 2C View 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. 2C View 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. 2D View 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. 2E View 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, 2D View FIGURE 2 ) oval, black, surrounded by faint yellow halo. Antennae ( Fig. 2H View 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. 2F View 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. 2G View FIGURE 2 1 View FIGURE 1 , 2G2 View 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. 2H View 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. 2H View 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, 2H View FIGURE 2 ) with submentum trapezoidal, having one seta near each anterolateral angle; mentum not sclerotized, trapezoidal; labial part proper in lateral view ( Figs. 2A, 2D View FIGURE 2 ) tongue-like, with apex depressed, in ventral view ( Figs. 2E, 2H View 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, 3B View 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. 3B View 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. 3B View FIGURE 3 ) slender, progressively enlarged from base to subapex, with distal 1/3 suddenly narrowed. Meso- and metanota ( Fig. 2A View FIGURE 2 ) unsclerotized, white in colour; meso- and metaepisternum somewhat triangular, mes- and metepimera semicircular.

Legs. Legs ( Fig. 3C1–3C3, 3D View FIGURE 3 View FIGURE 1 View FIGURE 2 ) yellowish brown and sclerotized, with few scattered bristles on coxae, femora, and tibiae. Forelegs strongest, hind legs smallest. Forecoxae cylindrical ( Fig. 3C View FIGURE 3 1 View 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. 3D View 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. 2A View FIGURE 2 ). Anal prolegs ( Fig. 3E View 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 2017 GoogleMaps   ; 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 2017 GoogleMaps   ; 1 larva, Shui-wu-li, 30.3550°N, 119.5958°E, Alt. 230 m, 12 Oct 2017 GoogleMaps   ; 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 2017 GoogleMaps   , 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 2016 GoogleMaps   , collected by Ji-hua Xu.

Distribution. China (Zhejiang, Fujian).