Rhyacophila morsei subsp. concaviuscula Sun, 2016, n. ssp.
Creators: name: Sun, Chang-Hai
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Rhyacophilidae
Rhyacophila
Rhyacophila morsei
Rhyacophila morsei concaviuscula

description: Rhyacophila morsei concaviuscula n. ssp.
Figs. 5 A–E
Length of each forewing 8.0 mm. Body (in alcohol) yellowish brown. Head yellowish brown; antennae yellow, palpi brown. Thorax yellowish brown dorsally and light brown laterally and ventrally; legs yellowish brown, spurs dark brown; wings light brown. Abdomen dark brown dorsally and yellowish brown ventrally.
Male genitalia. Segment IX (IX) with upper portion longer than its lower portion in lateral view (Fig. 5 A), upper margins slightly sinuate, each anterior margin almost straight with shallow incision in lower part, upper half of posterior margin straight and lower half shallowly incised; trapezoidal in dorsal view (Fig. 5 B), with its anterior margin slightly concave, posterior margin irregularly convex, wider than long. Segment X in dorsal view subrectangular (Fig. 5 B), apex shallowly incised; upper portion (u.p.) large, shallowly biconcave anterodorsally and posteriorly in lateral view (Fig. 5 A), somewhat saddle-like, dorsal margin sinuate, posteroventral angles produced into pair of small lobes; lower portion (l.p.) vertical, slender in lateral and caudal views (Figs. 5 A, 5C, 5D), with pair of small subapical lobes, lower margins shallowly concave in caudal view. Anal sclerites (a.s.) small, button-like, with long roots (r.). Apical band (u.) irregular in lateral view (Fig. 5 D), pentagonal in caudal view with lateral arms curved (Fig. 5 C). Tergal strap (t.s.) in lateral view triangular (Fig. 5 D), with its base fine and progressively enlarged to distal end. First joint of each inferior appendage trapezoidal, dorsal margin about half as long as ventral margin, distal margin straight in lateral view (Fig. 5 A); second joint separated into two branches with equal width and rounded apices in lateral view. Phallic apparatus complicated: Phallotheca (pht.) rectangular; dorsal process (d.p.) and aedeagus (aed.) in lateral view (Fig. 5 D) tube-like and equal in length and width, in dorsal view dorsal process progressively wider from base to distal end; ventral plate of aedeagus trifurcate, with middle lobe (m.l.) broad and apically truncate, pair of lateral lobes (l.l.) pointed and slightly shorter than middle lobe. Paramere (par.) large, its base membranous, distal half in lateral view somewhat elliptical, with dense fringe of setae apically.
Holotype. Male: CHINA: Gui-zhou Province, Chi-shui city, Hu-shi town, Nan-zhu-lin-fang subdivision, Jinsha-gou work area, Gan-gou, 28.4734°N, 106.0056°E, elev. 460 m, 9 June 1995, collected by WANG Bei-xin and SUN Chang-hai.
Diagnosis. The male genitalia of the new subspecies are very similar to those of the more northern R. morsei morsei, but differ from the latter in that (1) the upper portion of segment X in lateral view has its dorsal margin slightly sinuate (almost straight in R. morsei morsei); (2) the upper portion of segment X in dorsal view is as wide as long (obviously wider than long in R. morsei morsei).
Etymology. The specific epithet is the Latin word concaviusculus, meaning “slightly concave” in reference to the upper portion of segment X with a shallow concavity in lateral view.
Distribution. China (Gui-zhou).
description: Published as part of Sun, Chang-Hai, 2016, Notes on the Rhyacophila scissa species group with description of two new taxa from China (Trichoptera, Rhyacophilidae), pp. 441-452 in Zootaxa 4072 (4) on pages 449-450, DOI: 10.11646/zootaxa.4072.4.3, http://zenodo.org/record/255777