Lannapsyche altilis, Morse, John C., 2017

Morse, John C., 2017, Lannapsyche and Marilia species of China (Trichoptera: Odontoceridae), Zootaxa 4320 (1), pp. 81-99 : 84-87

Lannapsyche altilis n. sp.

( Figs. 2 , 4 )

Diagnosis. This species is most similar to Lannapsyche setschuana , for males especially in that the apex of the harpago is covered with thick, triangular setae; the preanal appendages are present as convex, setose areas, each merged with the sides of the mesal projection of segment IX and the base of segment X; and the dorsal edges of segment X are each expanded laterad to form a pair of elongate plates in dorsal view. The new species is distinguished from Lannapsyche setschuana in having 1) the expanded dorsal edges of segment X longer and narrower, each about 5 times as long as its average width and with the subbasolateral projection smaller and rounded, the mesal cleft is only about 1/3 as long as tergum X, and the pleura of segment X are visible in dorsal view (in L. setschuana the expanded dorsal edges are 4 times as long as its average width, each with a large triangular subbasolateral projection, the mesal cleft is very deep and 6/7 as long as tergum X, and the pleura of segment X are not visible in dorsal view). 2) The subapicodorsal lobe of each inferior appendage is short with a rounded apex and is about as long as the subapicoventral lobe in lateral view (in L. setschuana the subapicodorsal lobe of each inferior appendage is elongate and is 2 times as long as the subapicoventral lobe in lateral view). 3) Each harpago is short and oval in lateral and ventral views and the seta-bearing apex is oval with its mesal margin convex in ventral view (in L. setschuana each harpago is broadly triangular in lateral view and the seta-bearing apex is elongate and kidney-shaped with its mesal margin concave in ventral view).

Adult. Length of each male forewing 10.8 mm (n = 1). Specimen in alcohol generally dark brown, forewings brown. Forewings ( Fig. 2 Fa) each with R1 not confluent with R2 at apex, but gradually approaching each other distally, R4 sinuate with apex closer to R3, such that apical distance between R4 and R5 at least 2.5 times distance between R2 and R3 or R3 and R4; forks I, II, III, and V present; forks I, II, and V sessile, fork III petiolate; crossvein m -cu set just beyond base of fork V; single anal vein with dense row of bristles ventrally. Hind wings ( Fig. 2 Fp) each with R1 nearly running into R2 after tip of Sc and then disappearing (arrow); crossvein r-m between R5 and MA present (arrow).

Male genitalia. Pleura IX each divided by longitudinal oblique groove into dorsal and ventral parts in lateral view; in lateral view on each side anterior and posterior margins of segment IX dorsally and ventrally concave, leaving rounded productions at ends of longitudinal groove, anterior production about 60° and about 1/3 distance from ventral margin, posterior production broader, about 80°, occupying median 1/3 of posterior margin ( Fig. 2A ).

Tergum IX produced posteromesally into short triangular lobe with its length shorter than its basal width in dorsal view ( Fig. 2B ). Preanal appendages present as convex, setose areas, broadly attached to tergum IX on either side of mesal projection ( Fig. 2B ). Segment X forming broad lobe, nearly rhomboid, tapering from mid length to apices in lateral view ( Fig 2A ); in dorsal view tergum X cleft apically about 1/4 its length, with dorsal edges flattened, each expanding laterad and forming pair of slender belts, each about 5 times as long as its average width and slightly convex at mid length, pleural portions of segment X visible ( Fig. 2B ). Inferior appendages with coxopodite parallel-sided, stout, straight, length between base of appendage and subapical lobes about 3 times its width in lateral view, subapicodorsal lobe short with rounded apex and slightly longer than short, triangular subapicoventral lobe ( Fig. 2A ). Harpago short, oval, embedded between subapical lobes of each coxopodite in lateral view, setose apex oval with its mesal margin convex in ventral view ( Fig. 2C ). Phallus slightly shorter than inferior appendages; phallobase with narrow constriction 1/3 distance from base, evenly bulged and curving backward in distal 2/3, lightly sclerotized phallicata projecting apicoventrally ( Fig. 2D ), in ventral view bulged portion slightly broader than base ( Fig. 2 Dv); ejaculatory duct conspicuous, phallotremal sclerite elongate with U-shaped opening in ventral view ( Figs. 2D, 2 Dv).

Female genitalia. Segments IX and X and gonopods VIII and IX firmly united and sclerotized, dark brown. In dorsal view, anterior parts of tergite IX ( Fig. 4B, t .IXa+IXb) narrowed and concave anteromesally and posteromesally with median length about 1/3 as long as lateral margins ( Fig. 4B ). Posterior part of tergite IX and tergum X ( Fig. 4B, t .IXc+X) deeply divided apically nearly to base, each resulting apical lobe broadly rounded, about 4/5 as broad as basal width, apical setae dark brown, up to 1/2 as long as apical lobes; width (d) between apical portions of two apical lobes almost as broad as base of 1 lobe ( Fig. 4B ). In lateral view, dorsal margins of terga IXc+X nearly straight, sloping downward with apex of terga IXc+X not tilting upward; on each side longitudinal lower lateral margin of tergite IXa+IXb almost truncate ( Fig. 4A ). In ventral view, spermathecal sclerite tapered anteriorly, with distal 1/3 subtriangular, posterior end with oval sclerite on each side. Subgenital plate ( Fig. 4C , subg.pl. = fused external gonopods VIII and IX, or e.gon.VIIIa+VIIIb+IX) with diamond-shaped grey bands around region of spermathecal sclerite ( Fig. 4C ).

Holotype male. PR CHINA: An-hui Province , Jiu-hua Mountain, N30.4°, E117.8°, alt. 800–1000 m, 5-vi- 1989, Coll. Sun C-h.

Paratypes. Same data as holotype, 2 females ( NJAU); same data as holotype, 1 male and 1 female ( CUAC, Odontoceridae #009).

Etymology. Latin, altilis = fattened, with reference to the stout harpago of each inferior appendage.

Distribution. Oriental Biogeographic Region, southern China (An-hui).

Figures

FIGURE 2. Lannapsyche altilis n. sp., male genitalia and wings. 2 A – 2 D, male genitalia: 2 A, left lateral; 2 B, dorsal; 2 C, ventral; 2 D, phallus, left lateral; 2 Dv, phallus, ventral. 2 Fa – 2 Fp, right wings, dorsal: 2 Fa, forewing; 2 Fp, hind wing.

FIGURES 3 – 4. Lannapsyche spp., female genitalia. 3, L. setschuana Malicky & Chantaramongkol 1995: 3 A, left lateral; 3 B, dorsal; 3 C, ventral. 4, L. altilis sp. nov.: 4 A, left lateral; 4 B, dorsal; 4 C, ventral.