Orthotrichia subrhomba Zhou & Morse, sp. nov.
Creators: name: Lei, Zhou
name: Lian-Fang, Yang
name: Morse, John C.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Hydroptilidae
Orthotrichia
Orthotrichia subrhomba

description: Orthotrichia subrhomba Zhou & Morse, sp. nov.
Figs 28–32
Material. Holotype ɗ, Fujian Province, Jiu-qu-xi (118°01'12"E, 27°27'00"N), elev. 220 m, 1990-v-30, Coll. J. C. Morse, Liu Chang-Ming, Huang Jian. Paratype: 1ɗ, same data as holotype.
Etymology. The Latin prefix " sub -" means "almost“ and the word “rhomba“ means “diamond", referring to the nearly diamond shape of the right posterolateral process of segment IX.
Description. Male. Antennae 23–24-segmented. Anterior wing length 1.7 mm. Ventral process of segment VI short spine in lateral view (as in Fig. 22). Ventral process of segment VII absent.
Male genitalia (Figs 28–32). Anterior margin of segment IX irregularly curved, with shallow rectangular excision in dorsal view (Fig. 30), bluntly convex in ventral view (Fig. 31), broadly excised in trapezoid in left lateral view (Fig. 28) and with triangular excision in right lateral view (Fig. 29); left posterolateral process absent (Fig. 28), right posterolateral process nearly diamond-shaped with its vertical axis about 2 times as long as that of its longitudinal axis its ventral projection long, beak-like in right lateral view (Fig. 29). Tergum X (X) fused with segment IX in dorsal view (Fig. 30), its left margin longer than right margin, its apex obliquely excised, its left distal end produced in strong ventral hook; dorsal spine of X arising near center of its base, hook-like, directed downward and to right. Inferior appendages (inf. app.) asymmetrical (Fig. 31), each appendage broad at base and fused in subquadrate plate, right appendage deeply and broadly excised, divided into 2 slender branches, its inner one long, curved slightly upward, with apex bare and extending beyond tergum X, its outer branch 5/6ths as long as its inner branch and bearing apical seta; left inferior appendage 3/4ths as long as inner branch of right inferior appendage and bearing apical seta. Bilobed process (bil. pr.) forming widely separated pair of slender, tube-like branches positioned above bases of inferior appendages, each branch with apical seta. Paramere spine (pa.) long, slightly longer than dorsum of IX+X. Phallus (Fig. 32) slender, with basal portion about 2.5 times as long as distal portion, distal portion enlarged, twisted, foliaceous, titillator encircling phallus 1 time.
Diagnosis. This species is not assignable to any group. It is somewhat similar to Or. vertumnus Malicky & Chantaramongkol, 2007, from Thailand, in the general shapes of segment IX and the phallus, and in the presence of a tube-like bilobed process, but differs in that 1) tergum X has a well developed, hook-like dorsal spine (without a dorsal spine in Or. vertumnus) and 2) tergum X has its left distal end produced in a strong hook (both distal ends straight in Or. vertumnus).
Distribution. Type locality only.
description: Published as part of Lei, Zhou, Lian-Fang, Yang & Morse, John C., 2010, Six new species and 1 new species record of Orthotrichia (Trichoptera: Hydroptilidae) from China, pp. 29-41 in Zootaxa 2560 on pages 37-38, DOI: 10.5281/zenodo.197113