Chimarra paramonorum Hu & Wang & Sun 2018, new species
Creators: name: Hu, Yan-Li
name: Wang, Bei-Xin
name: Sun, Chang-Hai
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Philopotamidae
Chimarra
Chimarra paramonorum

description: Chimarra paramonorum new species
(Figs 2–4)
Diagnosis. The new species belongs to Ross’ (1956) C. digitata Lineage or the C. digitata Species Group, closely related to C. monorum Chantaramongkol & Malicky 1989 from Thailand and C. thienemanni Ulmer 1951 from Java. Chimarra paramonurum n. sp. differs from C. thienemanni in the small preanal appendages and the narrow bases of the inferior appendages in lateral view. It can be separated from C. monorum readily by the overall shape of the lateral lobes of segment X in lateral view and the endotheca which is “wrinkled” rather than with dense hairs as in C. monorum. In addition, the apicoventral projection of the phallobase in C. paramonurum n. sp. is much longer than in the latter two species.
The larva of C. paramonorum n. sp. can be diagnosed from known larvae of other congeners by the following combination of characters: (1) The anterior margin of the frontoclypeus is somewhat rounded, with a small notch mesolaterally on the right side; (2) the left and right mandibles each have an inner margin with 6 and 5 subapical teeth, respectively, and (3) the forecoxae each have a much longer seta-bearing process.
Adult male. Length of each forewing 4.5 mm. Body fuscous; Head dark brown, antennae and palpi light brown. Thorax dark brown dorsally, light brown laterally and ventrally; legs light brown, with spurs dark brown; wings light brown. Abdomen brown.
Male genitalia. Segment IX (IX) in lateral view with upper portion longitudinally shorter than ventral portion, anteroventral margin produced and rounded anteriorly, posteroventral margin produced as large triangular ventral process (ve.pr.) (Fig. 2A); in dorsal view very short, forming transverse bridge, anterior margin shallowly concave, posterior margin somewhat fused with segment X (Fig. 2B); in ventral view ventral process elongate-triangular (Figs 2C). Preanal appendages (pr.ap.) small, setose, each elliptical in lateral view and elongate-elliptical in dorsal view (Figs 2A, 2B). Lateral lobes of segment X (la.lo.) in lateral view each with dorsolateral and posterolateral angle produced into upper thumb-like process and lower digital process, with acute basoventral angle; in dorsal view upper thumb-like process with 2 sensilla (Figs 2A, 2C). Mesal lobes of segment X (me.lo) membranous, in lateral view elliptical, in dorsal view widely and deeply separated (Figs 2A, 2B). Inferior appendages (in.ap.) in lateral view with apices slightly extended beyond lower digitate processes of the lateral lobes of tergum X, each slightly S-shaped, with base about 2.5 times wider than apex, setose; in ventral view with base slightly wider than apex, curved mesad (Figs 2A, 2C). Phallobase (ph.) tubular, in lateral view basodorsally expanded, ventral apex obviously projecting, subacute; length of endotheca (en.) indiscernible (not everted), with one long endothecal spine (en.sp.); phallotremal sclerite (ph.sc.) composed of three short sclerites (Fig. 2D), basodorsal one irregular, basoventral one reniform, posterior one somewhat triangular.
Larvae (5th instar) Body length 7–10 mm (n = 3), (in alcohol) generally white in colour with head, pronotum, legs, and anal claws yellowish brown.
Head. Head capsule (Figs 3B, 3C) with black spot at each posterolateral margin, elliptical in dorsal and lateral views, slightly narrower anteriorly, with smooth surface. Dorsal ecdysial suture 1/3 as long as frontoclypeus; frontoclypeus elongate-Omega-shaped, constricted at its posterior 1/3 (Figs 3B, 3D), anterior margin dark brown, asymmetrical, having broadly rounded projection on left side and narrower triangular one on right side, separated by single deep notch right of center, each projection with four setae, one long seta mesally and three short setae laterally. In lateral view (Fig. 3C), head capsule posterior margin slightly concave at middle, with above-mentioned black spot at concavity; frontoclypeus and mandibles separated widely to accommodate membranous labrum. In ventral view (Fig. 3F), both anterior and posterior margins acutely incised, with anterolateral angles each having two long setae, pair of No. 18 setae located anterosubmesally near posterior apex of ventral apotome. Ventral apotome triangular, with anterior margin slightly concave. Eyes (Figs 3A, 3B) black, oval, each surrounded by paler yellow halo, distance from anterior margin of eye to base of mandible about 2 times eye diameter. Antennae (Fig. 3E) simple, each situated in small light area near base of mandible, consisting of two club-shaped spines accompanied by two short fine setae. Labrum (Fig. 3G) membranous, somewhat T-shaped in dorsal view; with anterior margin having brush of dense setae curved downwards, each anterolateral angle having tuft of long setae, and middle portion immediately behind brush of setae with 4 setae, two longer anterior ones separated widely and two shorter posterior ones near each other. Mandibles (Figs 3H 1, 3H 2, 3I 1, 3I 2) each with convex outer margin bearing two bristles; left mandible (Figs 3H 1, 3I 1) mesal margin with prominent projection near basal 1/3, and with 5 subapical teeth and larger acute tooth at apex; right mandible (Figs 3H 2, 3I 2) inner margin sinuate and bearing 4 subapical teeth and larger blunt tooth at apex. Submental sclerite (Fig. 3F) subrectangular, with two short setae at each anterolateral corner. Maxillary palpi (Fig. 3J) each 4-segmented and straight; palpifer inner margin having tuft of short incurved bristles; maxillary lobe (Fig. 3J) bearing several fine bristles on inner margin and small curved bristle on outer subapical margin.
Thorax. Pronotum (Figs 4A, 4B) subrectangular in dorsal view, slightly longer than wide, strongly sclerotized, with posterior and posterolateral borders black; with transverse depression across anterior 1/3 (also seen in Fig. 3A); anterolateral corners each with tuft of four setae, posterolateral margins each with two setae, and dorsal surfaces of each sclerite having three setae behind transverse depression, anterior seta much longer than two posterior setae. Foretrochantins (Fig. 4B) small, in dorsolateral view subrectangular. Meso- and metanota membranous.
Legs. Legs (Fig. 4C) each with few bristles and several stronger curved yellow bristles on coxae, femora, and tibiae. Forelegs (Fig. 4C 1) slightly longer and thicker than mid- and hind legs, and darker than mid- and hind legs; forecoxae short, subrectangular in posterior view, each with subapicodorsal seta-bearing process about half as long as coxa; trochanters each 2-segmented, first segment somewhat rectangular, second segment triangular; femora cylindrical, each with basal margin obliquely truncate, apex slightly thickened; tibiae slender, about half as wide as femora, and obviously shorter than femora; tarsi (Fig. 4D) cylindrical, each slightly tapering to apex, with row of short spine-like setae ventrally; claws (Fig. 4D) small but well developed, curved downwards, with conspicuous basal seta. Mid- and hind legs similar to forelegs in overall structure, except their coxae much longer and lacking seta-bearing processes, their femora, tibiae, and tarsi shorter; claws of mid- and hind legs also similar, about same size as those of forelegs.
Abdomen. Abdominal segments I–IX with sparse short setae. Lateral fringe absent; segments I–VIII without tracheal gills; segment IX in dorsal view with posterior margin concave, with four single apicodorsal anal gills (Figs 4E, 4F). Anal prolegs (Figs 4E, 4F) elongate and separated widely in dorsal view, lateral sclerites moderately sclerotized, apices truncate; ventral sole plate small, visible only in lateral view (Fig. 4F); anal claws (Fig. 4F) in lateral view with thick bases and sharp apices curved downwards at 90 degrees, each with three small basodorsal setae.
Holotype male, CHINA, Zhe-jiang Province, Jiang shan, Er-ba Town, Xin-dun-cun, 28.2996°N, 118.5359°E, Alt. 608.9 m, 12 Aug 2016, collected by Chang-hai Sun and Ji-hua Xu. Paratypes: 20 males, CHINA, Zhe-jiang Province, Le Qing, Xian-xi Town, Shang-bei-ge-cun, 29.26306°N, 120.9731°E, Alt. 229.3 m, 26 May 2017, collected by Yan-li Hu and Chang-hai Sun; 7 larvae, CHINA, Zhe-jiang Province, Le Qing, Xian-xi Town, Shangbei-ge-cun, 29.26306°N, 120.9731°E, Alt. 229.3 m, 26 May 2017, collected by Yan-li Hu and Chang-hai Sun; 5 larvae, CHINA, Zhe-jiang Province, Jin hua, Yao-chuan Town, Niu-lan-ping, 29.1022°N, 120.5358°E, Alt. 251.79 m, 27 Mar 2018, collected by Yan-li Hu, Cong Wu, and Jin Gao.
Other materials: 25 males, CHINA, Zhe-jiang Province, Le Qing, Xian-xi Town, Shang-bei-ge-cun, 29.26306°N, 120.9731°E, Alt. 229.3 m, 26 May 2017, collected by Yan-li Hu and Chang-hai Sun.
Etymology. The specific epithet is from Latin prefix para-, meaning “similar to,” and the congeneric species name monorum, referring to the similarity in the male genitalia of these two species.
Distribution. China (Zhe-jiang).
description: Published as part of Hu, Yan-Li, Wang, Bei-Xin & Sun, Chang-Hai, 2018, A new species of Chimarra from China (Trichoptera, Philopotamidae) with description of its larva, pp. 253-260 in Zootaxa 4504 (2) on pages 255-258, DOI: 10.11646/zootaxa.4504.2.6, http://zenodo.org/record/2613915