Allotrichia rhynchophyllum Zhou, Yang & Morse 2016

Ito, Tomiko & Shimura, Noriyoshi, 2019, Notes on six microcaddisfly species (Trichoptera: Hydroptilidae) recorded for Japan, one a newly described species, Zootaxa 4629 (1), pp. 26-38 : 26-38

publication ID	https://doi.org/ 10.11646/zootaxa.4629.1.2
publication LSID	lsid:zoobank.org:pub:355A5C5E-3FD0-42AA-A722-207D5D80F9DC
DOI	https://doi.org/10.5281/zenodo.5923038
persistent identifier	https://treatment.plazi.org/id/03EC7639-FF96-531F-FF49-F98DAEAB5A77
treatment provided by	Plazi
scientific name	Allotrichia rhynchophyllum Zhou, Yang & Morse 2016
status

Treatment

( Fig. 5 View FIGURE 5 )

Allotrichia rhynchophyllum Zhou, Yang & Morse 2016 , 206–208, male, northeastern China.

Ugandatrichia shinshiroensis Ito, Nishimoto & Nishimoto 2018 , 492–500, male, female, pupa, larva, habitat, central Japan. New synonym.

Revised description. Male. Forewings brown with many small light markings on dorsal surfaces and white long hairs on costal margins in alcohol; hind wings light brown. Wing length: forewings each 3.1–3.7 mm, hind wings each 2.5–3.2 mm (n = 5). Ventromesal process of abdominal sternite VII thick, long, turned ventrad at apical 1/3, truncate apically.

Male genitalia ( Figs 5 View FIGURE 5 A–5G). Almost bilaterally symmetrical except phallus. Segment IX (IX) large, subtriangular and produced anterad in lateral view, subquadrate with broad anterior concavities in dorsal and ventral views. Dorsal plate (d.pl.) membranous, round in lateral view, pentagonal with deep, U-shaped, posteromesal concavity in dorsal view. Subgenital plate (s.pl.) distinctly longer than dorsal plate, broad-based, strongly tapered, and curved ventrad in apical half; with 2 pairs of short slender lateral processes medially, anterior pair (ap.s.pl.) directed anterad at first and then evenly recurved dorsolaterad in dorsal view, posterior pair (pp.s.pl.) directed laterad in dorsal view. Inferior appendages (i.a.) large, subquadrate, gradually expanded posteriorly, each with 2 thick long setae near posterodorsal corner, many short setae on lateral surface and slender large V-shaped sclerite on dorsomesal surface. Phallus long, titillator (ti.) encircling at mid-length and elongate posteriorly to middle of aedeagus.

Specimens examined. China: Hei-long-jiang, Yi-chun City, Wu-yi-long, Wu-yun River in the Town of Yongsheng, holotype male, 31.ii.1993, Sun C-h (deposited in the Department of Entomology, Nanjing Agricultural University, Nanjing). Japan: 214 males, 347 females, 41 pupae, 13 final instar larvae as Ugandatrichia shinshiroensis Ito et al. 2018 from 9 localities in Honshu & Shikoku, 2012–2015 (detail data in Ito et al. 2018).

Distribution. China (Hei-long-jiang), Japan (Honshu, Shikoku).

Remarks. This species was originally described and diagnosed based on a male from northeastern China with the following characteristics: The distal half of the subgenital plate is strongly downcurved and apically acute in lateral view; the inferior appendages have posterior margins slightly concave and a large rectangular basal projection mesally; the phallic apparatus has a titillator arising at almost half length and has the aedeagus slightly enlarged and bilobed apically. The male of Ugandatrichia shinshiroensis ( Figs 5 View FIGURE 5 A–5G), described originally from central Japan, differs little from that of Allotrichia rhynchophyllum . Only the slender projections of subgenital plate and dorsal plate differ slightly as follows: The projections are short and the dorsal plate has a large U-shaped concavity apically in U. shinshiroensis ( Fig. 5B View FIGURE 5 ), whereas the projections are long and the dorsal plate is almost straight without a concavity in A. rhynchophyllum ( Figs 2A, 2B View FIGURE 2 in Zhou et al. 2016). However, the projections and dorsal plate are individually variable even in specimens from the same site ( Figs 5F, 5G View FIGURE 5 ). Thus, we recognize U. shinshiroensis as a junior synonym of A. rhynchophyllum . Species of the genus Allotrichia McLachlan are found in the West Palearctic (8 extant and 3 fossil) and East Palearctic (1 species) regions ( Zhou et al. 2016) and, with this change, the genus is now recorded in Japan.

The female, pupa, larva and case of this species were described and diagnosed under the name U. shinshiroensis ( Ito et al. 2018) . The larval characteristics and their cases conform with those of a widespread European species, A. pallicornis (Eaton) ( Wallace et al. 1990, Waringer & Graf 2011), in having laterally compressed larvae without any dark patterns on the head and thorax, swollen apicoventral corners on the tibiae of 3 thoracic legs, and laterally flattened cases made of filamentous algae. However, several features such as some pairs of ventral sclerites on the pro-and mesonota, ovoid chloride epithelia on abdominal segments IV–VIII, and a single median gill on segment IX ( Figs 3 View FIGURE 3 , 4 View FIGURE 4 by Ito et al. 2018) have not been observed in the European species.

The habitat and ecology were also reported by Ito et al. (2018) for the species in Japan. The larvae and pupae were found in the middle reaches of fast-flowing streams. Light trap collections in central Japan demonstrated that the adults have long flight periods, from spring to autumn. These ecological characters are also very similar to those reported for A. pallicornis in Europe ( Graf et al. 2008). However, the microhabitat of pupae and larvae in Japan, i.e., on small loose rocks inserted in crevices, may be distinct.

Japanese name. Kawari-ô-hime-tobikera-zoku (newly given here). Shinshiro-ô-hime-tobikera (assigned originally to U. shinshiroensis ).