Polyplectropus trigonius Zhong, Yang, & Morse 2008
Creators: name: Oláh, János
name: Johanson, Kjell Arne
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Polycentropodidae
Polyplectropus
Polyplectropus trigonius

description: Polyplectropus trigonius Zhong, Yang, & Morse, 2008   
Figures 41–44  
Type locality: China (Guangxi).  
 Remarks: This species was described in Chinese, with an English abstract. It is re-described below based on new material.   
 Diagnosis: The genitalia of this species have both dorsal and ventral paraproctal processes. Also P. nangajna Malicky & Chantaramongkol from Thailand and P. acuminatus Li & Morse from China (Anhui) have both processes, but the new species has bilobed processes and not monolobed processes; in ventral view, the apices of the gonopods are pointed, not truncated like in P. acuminatus; and the dorsal paraproctal processes are bifid.   
 Re-description: Male. Body uniformly brown. Maxillary palp formula (I,II)-IV-III-V; 3rd segment of each maxillary palp originating subapically from lateral surface. Forewing length 6.5 mm; each with discoidal cell closed; median cell closed; and apical forks 1, 2, 3, 4 and 5 present. Hind wings each with discoidal cell open, apical forks 2 and 5 present.   
Male genitalia. Sternite IX robust, sclerotized, subrectangular, with quadrangular lobe on dorsoapical margins near cerci; narrow, parallel-sided, obliquely directed, sclerotized tergite IX covered with tiny microtrichae. Segment X membranous, obliquely elongate in lateral view (Fig. 41); rounded, with mesal hump in dorsal view (Fig. 42); transparent, almost indiscernible when cleared. Cerci long, setose, clavate. Paraproctal complexes fused with cerci, each with 2 paraproctal processes, and paraproctal body with subphallic sclerite. Dorsal paraproctal process smooth, spiniform, rooted and arching anteriorly of paraproct, apex bifid; ventral paraproctal process originating laterally on subphallic sclerite of paraproctal body, turning dorsad. Main paraproctal body with bilobed subphallic sclerite in lateral view (Figs. 41); dorsal and ventral lobes setose; dorsal lobes each with long, dense and light-coloured setal brush; ventral lobes with few short setae restricted to bottom, fused into subphallic sclerite of paraproct, flanking sides of paraproctal subphallic sclerite, and fused ventral part. Gonopods robust, horizontally elongate, complex, bilobed in lateral view (Fig. 41) and arrow-like with tapering, pointed apices in ventral view (Fig. 43). Phallic apparatus (Fig. 44) located dorsally in genitalia; phallotheca tube-like, clearly cut, sclerotized, continuing into short membranous endotheca or endophalus without visible sclerites.  
 Material examined: VIETNAM: Tam Dao, 200 m, 13.x.1986, sweep net along small tributary [J.   
Oláh]—(OPC).
description: Published as part of Oláh, János & Johanson, Kjell Arne, 2010, Generic review of Polycentropodidae with description of 32 new species and 19 new species records from the Oriental, Australian and Afrotropical Biogeographical Regions 2435, pp. 1-63 in Zootaxa 2435 (1) on pages 28-30, DOI: 10.11646/zootaxa.2435.1.1, http://zenodo.org/record/5315673