Rhyacophila coalita, Sun, 2016

Sun, Changhai, 2016, Two new species of the Rhyacophila anatina Species Group from China (Trichoptera: Rhyacophilidae), Zootaxa 4085 (2) : 275-276

publication ID	https://doi.org/ 10.11646/zootaxa.4085.2.7
publication LSID	lsid:zoobank.org:pub:440F225E-DAAF-43E0-A5B6-785533E3ABEC
DOI	https://doi.org/10.5281/zenodo.5672057
persistent identifier	https://treatment.plazi.org/id/3B11FD38-0270-CD6E-00A9-FEFB6792AD29
treatment provided by	Plazi
scientific name	Rhyacophila coalita
status	sp. nov.

Treatment

Rhyacophila coalita n. sp.

( Fig. 1A–1D View FIGURE 1 )

Male. Length of each forewing 6.5–7.0 mm (n=4). Body (in alcohol) yellow. Head yellow; antennae and palpi yellow; eyes black, ocelli pale; hairs brown. Prothorax yellow, pterothorax yellowish brown dorsally, yellow laterally and ventrally; wings brown; legs yellow, with spurs yellowish brown. Abdomen dark dorsally and yellow ventrally.

Male genitalia. Segment IX (IX) in lateral view short ventrally, long dorsally, dorsal margin about 9 times as long as ventral margin, its apicodorsal lobe (ad.l.) about 2/3 as long as basal segment of each inferior appendage (b.inf.app.); in dorsal view anterior margin of segment IX shallowly incised, its apicodorsal lobe constricted mesally to accommodate preanal appendages (pre.app.) and its apex shallowly incised. Preanal appendages slightly shorter than apicodorsal lobe of segment IX, in lateral view dorsal and ventral margins of each preanal appendage almost parallel to each other, apex rounded; in dorsal view preanal appendages somewhat nephroid. Segment X (X) in lateral view vertical, with dorsal and ventral ends curved cephalad; in caudal view somewhat rectangular. Anal sclerites (a.s.) in lateral view bar-shaped, oblique, posteroventral margins slightly concave; in caudal view subquadrate, with their bases fused. Basal segment of each inferior appendage long, in lateral view dorsal and ventral margins parallel to each other, anterior margin oblique, posterior margin subtruncate; apical segment (a.inf.app.) in lateral view somewhat sock-like, lower half of posterior margin with dense spinules. Phallic apparatus complex: phallotheca (pht.) in lateral view somewhat rectangular basally and triangular apically; dorsal process (d.pro.) elongate, heavily sclerotized, in dorsal view somewhat rectangular, with U-shaped apical emargination; aedeagus (aed.) tubular, in dorsal view with paired midlateral membranous bulbs (bul.); parameres (par.) slender, distal ends slightly bulging, setose, with strong mesal bristles.

Female. Unknown.

Diagnosis. The male of the new species resembles those of R. yipung SCHMID 1970 from India in the shape of the preanal appendages and R. elongata KIMMINS 1953 from Myanmar in the shape of the apical segment of each inferior appendage. It differs from them in that (1) The apicodorsal process of segment IX is longer and narrower than in R. ypung and less deeply incised apically than in R. elongata ; (2) the preanal appendages are not as long as the apicodorsal process of segment IX (subequal to that process in R. ypung ) and are taller and more nearly rectangular than in R. elongata ; (3) the parameres are not forked (forked in R. ypung ); (4) the dorsal process of the aedeagus in dorsal view has its apex deeply incised (not incised in either R. yipung and R. elongata ); (5) anal sclerites are paired, but fused at their base (paired but not fused in R. yipung , fused completely in R. elongata ); and (6) the aedeagus has a pair of membranous bulbs at the middle (without such structures in either R. yipung and R. elongata ).

Etymology. The species name comes from the Latin adjective coalitus meaning "combined," or “grown together,” or “united,” in reference to the pair of anal sclerites fused at the base when viewed caudally.

Holotype Male. CHINA: Jiang-xi Province, Wu-yi-shan National Nature Preserve, unnamed tributary of Tong-mu River , 27.83973°N, 117.7224°E, elev. 943 m, 3 June 2005, collected by ZHOU Chang-fa GoogleMaps . Paratypes. Same collection data as holotype, 1 male; same collection data as holotype except 18 km upstream of Wu-Yi Shan Station, 27.8275°N, 117.7436°E, elev. 1450 m, 2 June 2005, collected by SUN Chang-hai, 1 male; Guang-dong Province, Xin-yi County, Da-cheng Town, Da-wu-ling Nature Reserve, upstream of the stream at the entrance of the Reserve, 22.2689°N, 111.1967°E, elev. 1110 m, 26 May 2004, collected by SUN Chang-hai, 1 male.

Distribution. CHINA (Guang-dong, Jiang-xi).