Wormaldia anilla (Ross)

Muñoz-Quesada, Fernando J. & Holzenthal, Ralph W., 2008, Revision of the Nearctic species of the caddisfly genus Wormaldia McLachlan (Trichoptera: Philopotamidae), Zootaxa 1838, pp. 1-75 : 13-16

Wormaldia anilla (Ross)

Figures 6–13, 129

Wormaldia anilla ( Ross, 1941a: 55, pl. III, fig. 18), male, British Columbia, Canada (INHS) (as Dolophilus anillus ); Ross 1944: 292; Ross 1949: 154–157 (transferred to Wormaldia McLachlan 1865 ); Ross 1956: 38, 40, 42, 62, fig. 64 A; Denning 1956a: 79; Denning 1956b: 248, fig. 10: 16A; Fischer 1971: 188; Schmid 1982: 31, 32, 71 (map 14), figs. 152, 153, 158, 159; Armitage 1996: [work not paginated].

In 1949, Ross placed this species within subgroup 1 of the W. moesta Group. Later, Ross (1956) reconsidered his former W. moesta Group proposal for this genus and transferred W. anilla to the W. anilla Group, which was maintained by Armitage (1996) (Table 1).

This species is similar to Wormaldia occidea ( Ross, 1938a) , but differs in the shapes of sterna VII and IX, and the inferior appendage. Sternum VII in W. anilla is without a process posteromesally. On sternum VII in W. occidea , there is a prominent and subtriangular process posteromesally. Sternum IX in W. anilla has an elongate, slender, and pointed process posteromesally that arises preapically. Sternum IX in W. occidea has a smaller and truncate process posteromesally that arises subapically. When viewed laterally, the apical segment of the inferior appendage in W. anilla is slightly concave medially and widely rounded apically. The apical segment of the inferior appendage in W. occidea is straight medially, and very slightly truncately rounded apically. Wormaldia anilla can be distinguished from W. clauseni , new species, as discussed in the diagnosis of that new species. Wormaldia anilla specimens from Mt. Hood (Oregon), presented morphological variation in the shape of the posterior margin of tergum VIII from that of the holotype. The posterior margin of tergum VIII of the Mt. Hood specimens is very slightly sinuous or relatively straight mesally ( Fig. 11).

Adult (in alcohol). Length of forewing 5–7 mm (holotype: 6 mm). Head brown, with yellowish setae. Antennae long, slender, brown, with small, yellowish setae. Maxillary palps light brown, with yellowish setae. Labial palps yellowish, with lighter setae. Dorsum of thorax brown. Legs brown, with small, yellowish setae. Forewings yellowish, covered with fine, small, brown setae, with apical forks I, II, III, IV, and V present ( Fig. 12). Hind wings translucent, with very few fine, small, brown setae, with apical forks I, II, III, and V present ( Fig. 13).

Male genitalia ( Figs. 6–11). Sternum VII straight posteriorly without process mesally. Tergum VIII straight or sinuous posteromesally; when viewed laterally, posterodorsal corner slightly roundly projected. Sternum VIII straight or slightly convex posteromesally. Segment IX, when viewed dorsally, concave anteriorly; when viewed laterally, long, nearly subrectangular in appearance, convex anteriorly, straight posteriorly; when viewed ventrally, concave anteriorly, straight posteriorly with elongate, slender, pointed, mesal process arising preapically. Segment X, when viewed dorsally, triangularly elongate, narrowly rounded apically; when viewed laterally, stout, rounded apically. Superior appendages digitate; when viewed dorsally, parallel with segment X, stout, elongate, rounded apically; when viewed laterally, shorter than segment X. Inferior appendages 2-segmented; when viewed laterally, each with basal segment stout, subrectangular, elongate, broadest and convex medially, apical segment stout, subrectangular, elongate, relatively equal in length, narrower than basal segment, concave and narrowest medially, rounded and widened posteriorly; when viewed dorsally, apical segment as in ventral view; when viewed ventrally, basal segments of the 2 inferior appendages united for about their anterior 2/3rds, separated posteromesally by broad, moderately deep, U-shaped emargination, each basal segment stout, widest posteromedially, with outer margin convexly curved, apical segment tubularly elongate, narrowest and rounded posteriorly, with elongate and apicolateral patch of short, thin, black, spines on inner margin. Phallus, when viewed laterally, pistol-shaped, widest basally, tapering from middle to apex, membranous apically, very lightly sclerotized, with various visible, small, internal sclerites ( Fig. 10).

Material examined. CANADA: British Colombia: Holotype & Paratype: 2 males, Stave Falls , along very small brook, 6.vii.1940, H.H. & J.A. Ross (in alcohol, INHS) ; same except, Steelhead Creek , 6.vii.1940, H.H. & J.A. Ross, 7 males (in alcohol, INHS) ; Cultus Lake , 20.v.1934, W.E. Ricker, 1 male ( INHS) ; same except, 10.v.1935, 1 male ( INHS) ; 30.v.1935, 1 male ( INHS) ; 27.iii.1937, 1 male ( INHS) ; 24.v.1965, F. Schmid, 6 males ( CNC) ; Paratype: 1 Male, Vancouver, Marine Drive , 6.vii.1940, H.H. & J.A. Ross (in alcohol, INHS) ; N Vancouver, trib. Seymour Creek , 19.vii.1946, H.H. Ross, 1 male (in alcohol, INHS) ; same except, Tidalis Creek , 15.i.1939, W.E. Ricker, 1 male (in alcohol, INHS) ; S. Vancouver Is., 10.vii.1950, R. Guppy, 1 male ( CNC) ; E of Chilliwack, Cheam View , 10.viii.1950, H.H. Ross, 1 male (in alcohol, INHS) ; 5 mi [= 8 km] E of Hope , 28.vi.1973, H.J. Teskey, 1 male ( CNC) . USA: Idaho: Idaho Co.: Powell District, Low , New Elk Summit Rd. , 27.v.1972, R.A. Haick, 1 male (in alcohol, INHS) ; Oregon: Baker Co.: Spring Creek , 22.viii.1952, K.M. Fender, 1 male (in alcohol, INHS) ; Paratypes: 3 Males, Clackamas Co.: along Beaver Creek, tributary of Sandy River , 3.ii.1939, S.G. Jewett, Jr. (in alcohol, INHS) ; same except, Beaver Creek , 19.iv.1947, 7 males, 2 females (in alcohol, INHS) ; Mt. Hood, Still Creek, for Campground , 17.vii.1949, K.M. Fender, 6 males, 1 female (in alcohol, INHS) ; same except, 17.vi.1967, S.G. Jewett, Jr., 3 males (in alcohol, INHS) ; Forest Camp , 31.vii.1948, K.M. Fender, 1 male (in alcohol, INHS) ; Midden Lake outlet, Mt Hood, Nat. Forest , 4800 ft [= 1463 m], 23.vii.1953, W.E Ricker, 1 male (in alcohol, INHS) ; Bear Creek , 1.viii.1948, K.M. Fender, 14 males, 3 females (in alcohol, INHS) ; Wildcat Creek, trib. Sandy River , 15.vi.1947, S.G. Jew- ett, Jr., 1 male (in alcohol, INHS) ; Bear Creek, near Rhododendron , 16.vii.1947, K.M. Fender, 4 males, 2 females (in alcohol, INHS) ; same except, 16.xii.1947, 23 males, 16 females (in alcohol, INHS) ; Douglas Co.: Foster Creek , 8.vi.1965, F. Schmid, 1 male ( CNC) ; Hood River Co.: Oxbow Springs , 18.iv.1940, S.G. Jewett, Jr., 1 male (in alcohol, INHS) ; Jackson Co.: Prospect , 6.vi.1965, F. Schmid, 1 male ( CNC) ; Josephine Co.: O’Brien , 5.vi.1965, 1 male ( CNC) ; Lincoln Co.: Saddleback Mt. , 26.ix.1959, J.C. Dirks-Edmunds, 1 male ( INHS) ; Linn Co.: Cascadia , 19.v.1935, H.A. Scullen, 1 male (in alcohol, INHS) ; Yamhill Co.: McMinnville, High Heaven , 4.v.1947, K.M. Fender, 5 males (in alcohol, INHS) ; same except, Peavine Ridge, nr. McMinnville, Sta. 3A, 18.ix.1948, 1 male, 1 female (in alcohol, INHS) ; Gunaldo Falls , 18.vii.1952, K.M. Fender, 5 males (in alcohol, INHS) ; Washington: [Clark Co. (?)]: Ellsworth , 1.xii.1941, S.G. Jewett, Jr., 1 male, 1 female (in alcohol, INHS) ; King Co.: Barclay Creek, Hwy 2 W of Stevens Pass, 28.vi.1987, Armitage & Smith, 4 males (in alcohol, INHS) ; Issakwa , River, E. Fk., 14.v.1972, R.A. Haick, 1 male, 1 female (in alcohol, INHS) ; Lewis Co.: Lewis & Clark State Park , 28.vii.1952, K.M. Fender, 3 males, 1 female (in alcohol, INHS) ; Mason Co.: Hoodsport , 20.vii.1968, B.V. Peterson, 1 male ( CNC) ; Skagit Co.: Marblemount , 31.v.1965. F. Schmid, 1 male ( CNC) ; Whatcom Co.: N Branch Hutchinson Creek , E of Acme, 28.viii.1971, Ross, 1 male (in alcohol, INHS) .

Distribution. Canada: BC. USA: CA, ID (new record), OR, WA.