Setodes scutatus Yang & Hu & Morse 2020, n. sp.
Creators: name: Yang, Lian-Fang
name: Hu, Ben-Jin
name: Morse, John C.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Leptoceridae
Setodes
Setodes scutatus

description: Setodes scutatus n. sp. Yang & Morse
(Fig. 9)
Diagnosis. This species belongs to the Setodes argentiferus Group (Schmid, 1987), and is most similar to Setodes trilobatus Yang & Morse 1989 from northern China (Shaan-xi) in the following characters: 1) abdominal tergum X is broad, roof-like, its apicomesal portion is distinctively protruded backward beyond two apicolateral ends; 2) each inferior appendage is tri-branched; 3) the phallicata of the phallus is dilated subapically with a beak-like tip. It can be differentiated easily from S. trilobatus in the following characters: 1) the lower branch of each inferior appendage is long, blade like, with its length 1.2 times the length of the ventral margin of segment IX, and with a triangular projection on its dorsal margin in lateral view (the lower branch of each inferior appendage is a short oval lobe, with its length 2/3 the length of the ventral margin of segment IX in S. trilobatus); 2) the parameres are each branched subapically into two decurved hooks (not branched subapically in S. trilobatus); 3) the mesal branch of each inferior appendage is stout, with its apex strongly produced mesad into a triangular process and with the mesal end acute in caudal view, (the mesal branch is a narrow band, its apex with the mesal process slender in caudal view in S. trilobatus); 4) the paired basomedian lobes of tergum X are about as broad as the preanal appendages and with truncate apices in dorsal view (much smaller and subtriangular in S. trilobatus); and 5) the phallus has a narrow crescent phallobase (the phallobase is semicircular in S. trilobatus).
Adult. Length of each male forewing 6.5–7.0 mm (n = 5). Specimen in alcohol generally pale yellow, forewings without evidence of golden spots or striae, covered with concolorous fine hair. Wing venation typical for genus, cell R3 (between veins R3 and R 4+5) almost as long as fork of MA and MP (between veins M1+2 and M3+4), tips of fore- and hind wings acute (Figs. 9F, 9H).
Male genitalia. Segment IX longitudinally short dorsally, forming narrow transverse band (Fig. 9A). Preanal appendages large, setose mounds, positioned beside basomedian lobes of tergum X in dorsal view (Fig. 9B). Tergum X long and broad, roof-like with prominent median ridge (Fig. 9A); in dorsal view 1.5 times as long as wide, basal median lobes each with truncate apex and about as broad as preanal appendage (Fig. 9B), apicomesal end distinctively protruding backward beyond two apicolateral ends, forming trilobed apex (Fig. 9B). Inferior appendages each trifurcate, lower branch of appendage elongate blade-like, 1.2 times as long as ventral margin of segment IX and with triangular projection on midlength of dorsal margin in lateral view (Fig. 9A lower arrow); mesal branch short, 1/2 as long as upper branch of inferior appendage, with apex blunt in lateral view but in caudal or dorsal views strongly produced mesad into triangular process with acute mesal end (Figs. 9A middle arrow, 9A-a); small, setose papilla visible at base in caudal view (Fig. 9 C-a arrow); upper branch slender and sinuate, 2/3 as long as lower branch of inferior appendage, with apex bearing two long setae (Figs. 9A upper arrow, 9C-a.). Phallus with narrow crescentic phallobase; pair of parameres stout, originating above phallobase, curved caudad then sloping caudoventrad, each branched subapically into two decurved hooks with inner hook nearly transparent; phallicata strongly arched, slender, parallel sided in basal half in lateral view, with distal half expanded dorsolaterally into two broad subapical lobes, with abruptly narrowed beak-like apex directed downward (Fig. 9D).
Holotype male. PR CHINA: Shan-xi Province: Yi-cheng County, Xi-yan-zhen Town, Da-he Villege, Sangou-he Stream, N35.451, E111.932, alt. 996 m, water temperature 16°C, 15 Jun 2013, Coll. Sun Ch-h. and Xu Ji-h.
Paratypes. Same data as holotype, 4 males.
Etymology. Latin, scutatus, adjective, meaning shield-shaped, with reference to the broad, plate-like tergum X.
Distribution. East Palearctic Biogeographic Region, Northeast China.
description: Published as part of Yang, Lian-Fang, Hu, Ben-Jin & Morse, John C., 2020, Interesting new Chinese species of Leptoceridae and Odontoceridae (Insecta: Trichoptera) from several recent collecting efforts, pp. 138-160 in Zootaxa 4732 (1) on page 153, DOI: 10.11646/zootaxa.4732.1.6, http://zenodo.org/record/3662615