Marilia parallela Hwang 1957
Creators: name: Morse, John C.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Odontoceridae
Marilia
Marilia parallela

description: Marilia parallela Hwang 1957
(Figs. 6, 7)
Marilia parallela Hwang 1957: 395 –396. Type locality: Fu-jian, Shao-wu (China)
Marilia albofusca Schmid 1959: 326 –327. Type locality: Yun-nan, Li-Kiang (= Li-Jiang, China). New synonym.
We were able to collect several specimens from the type locality of Marilia albofusca (Li-Jiang, Yun-nan) during the same season as the holotype (12 June 1934 for the holotype, in comparison with 24 May 1996 and 19 July 1990 for specimens in this paper). The male genitalia of our specimens are congruent with those depicted for Marilia albofusca, although Schmid’s original drawings and description were very simple. Nevertheless, the diagnostic characters of wing venation, head wart pattern, eye size, and male genitalia are almost identical with those of M. parallela. Therefore, Marilia parallela is first synonymized here with M. albofusca. For clear comparisons, wing venation, head warts, and male genitalia are re-illustrated and redescribed. Female genitalia are described and illustrated here for the first time.
Male (in alcohol). Body medium-sized, generally brown; palps pale yellowish; vertex brown to dark brown, sometimes as dark as compound eyes; thorax brown, with concolorous thoracic setal warts; foreleg tibiae and tarsi dark brown, slightly darker than those of mid- and hind legs. Forewings brown, with posterior margin broadly concave distally and posterior subapical margin slightly concave. Vertex constricted; interocular length about 2.5– 2.8 times its least median width; vertexal medi-antennal compact setose warts (ver.m.war.) separate from each other (Fig. 6E).
Forewings (Fig. 6 Fa) each with length 8.5–10.1 mm (n = 13). R1 fused with R2 just before margin; forks I, II, and V present (forks I, II, III, and V present in female); forks I and V sessil, fork II petiolate (arrow). Single, unlooped anal vein with row of bristles ventrally. Hind wings (Fig. 6 Fp) each with R2 long, fused with R1 near margin, similar to most species of this genus, such as M. sumatrana Ulmer 1951, M. mogtiana Malicky 1989, M. javana Ulmer 1951, and M. lata Ulmer 1926; M stem together with MP forming continuing sinuous vein fused with Cu1 subapically; Cu1 stem not aligned with MP+Cu1, but joining MP+Cu1 at approximately 20° angle.
Male genitalia. Abdominal segment IX longest dorsally, in dorsal view its posterior margin entirely visible, projecting caudad, with mid-length of projection 2/3 of its basal width (Fig. 6B); in lateral view, median length 1/2 of its height; on each side anterior margin sinuous, slightly convex in ventral half and slightly concave in dorsal half; posterior margin with lateral apicodorsal corner (l.api.corn.) triangular (Fig. 6A), forming well developed rounded shoulder when viewed dorsally (Fig. 6B), below this corner deeply excised lacuna providing space for origin of preanal appendage, lateromedian apical lobe semicircular; longitudinal groove near mid height, short, running obliquely upward posteriorly (Fig. 6A) or into lateromedian apical lobe, but tip of groove never reaching posterior margin (Fig. 6A); dorsolateral longitudinal grooves absent. Intersegmental depression between segments IX and X distinctive in lateral view (Fig. 6A, upper arrow). Segment X forming tall and broad hood, its exposed portion shorter than mid length of segment IX in dorsal view (Fig. 6B), its apex shallowly divided into two rounded lobes, with apico-interlobular gap (api.ga.) narrowly triangular when apical lobes (api.lob.) fully opened (Fig. 6B); in lateral view, segment X about as long as dorsal margin of IX with its length 1.5 times its height, apical lobes broadly triangular, each ventral margin gently concave from base to near middle (Fig. 6A). Preanal appendages as long as segment IX, slender (as in Fig. 9 BI), foliaceous, each narrow at base, dilated in middle then slightly tapered, to blunt tip in lateral view. Inferior appendages slightly longer than segment X, directed caudodorsad to end before apex of segment X; coxopodite nearly straight, curving slightly ventrad in lateral view (Fig. 6A, lower arrow); in ventral view, each curved mesad in banana shape, broad at base, its basomesal setose bump (b.bum.) not distinctively protruding (Fig. 6C); apical segment (harpago) short, cylindrical, its base very slightly narrower, about as broad as tip of coxopodite in lateral view; at least 2 times as long as its mid width in ventral view. Phallic apparatus composed of ventrally curving phallobase and retracted or everted phallicata, phallobase slightly constricted at mid distance, tube-like in basal half with distal part enlarged and directed backward (Fig. 5D); phallotremal sclerite crescentic, moderately sclerotized (Fig. 6D).
Female genitalia. Segments IX and X and gonopods VIII and IX firmly united with each other. Posterior margin of anterior parts of tergite IX (Fig. 7B, t.IXa+IXb) not clearly differentiated from posterior part of tergite IX and tergum X (Fig. 7B t.IXc+X); resulting tergum IXc+X forming broad sclerotized hood; in dorsal view, trapezoidal and tapered posteriorly, with posteromedian margin of hood excised, this excision about 2.5 times as broad as long; terga IXc+X represented by pair of setose, apical lobes (Fig. 7B, t.IXc+X) on either side of indentation and excision, each with apicolateral margin obliquely truncate (Figs. 7B, 7C, t.IXc+X); area between these apical lobes slightly depressed, with small, semimembranous triangular protrusion at center (Fig. 7B); in lateral view, this apex subtriangular, dorsal margin of fused IX+X approximately horizontal except setose apical lobes IXc+X set lower than dorsal margin and dorsal margin of IXc+X convex (Fig. 7A); margins of pleura IXa+IXb visible laterally and ventrally, each side with small, but distinctive triangular projection located at middle of anterior margin (Fig. 7A, arrow), posterior margin strongly sinuate (Fig. 7A). In ventral view, subgenital plate (Fig. 7C, subg.pl. = fused external gonopods VIII, or e.gon.VIIIa+VIIIb) broad, sclerotized, with posterior margin quite convex and with two small triangular processes apicomesally. Pair of ventral lobes (v.lob. = external gonopods IX, or e.gon. IX) below anus (a.) large, with their transverse posterior margins at least 2 times as long as their longitudinal mesal margins; well-defined triangular, striate area (arrow) set on each ventral lobe, with its anterior ridges (scl.rid.) sclerotized, gently curved laterocaudad, and arranged more or less transversely (Fig. 7C). Spermathecal sclerite (Fig. 7C, sper.scl.) with diamond-shaped outline, broadest at 1/3 distance from anterior end in ventral view; in lateral view, dorsal margin of spermathecal sclerite deeply concave and ventral edge smoothly convex (Fig. 7A).
Specimens examined. PR CHINA: Zhe-jiang Province: An-ji County, Long-wang Mountain, N30.38°, E119.40°, alt. 490–550 m, 20–27 July 1995, Coll. Wu H., 8 males, 2 females; same data as above except 28–29 July 1995, 8 males, 2 females; 12 May 1996, 7 males, 1 female; and 10 July 1996, 4 males, 1 female. Lin-an County, Tian-mu Mountain, San-mu-ping (hamlet), N30.3589°, E119.4221°, alt. 780 m, 14–15 July 1998, Coll. Wu H., 1 male, 1 female; same data except 26 July 1999, 1 male. Yun-nan Province: Li-Jiang County, Shi-gu Town, Bridge of Chong-jiang River, N26.8°, E100.2°, alt. 1750 m, 25 May 1996, Coll. Yang L-f., Du Y-zh., 1 male; same county, except along Chong-jiang River, 8 km W. of Shi-gu Town, alt. 1850 m, 25 May 1996, Coll. Zhou Ch-f., Wang B-x., Gui F-r., 7 males, 2 females. Jin-ping County (now in Pu-er, Jin-dong Minority Municipality), N24.26°, E100.50°, alt. 1350 m, A-de-bo Town, Kun River, 19 July 1990, Coll. Li Y-w., Ke X., 1 male. Guang-xi Province: Jin-xiu County, N24.1°, E110.1°, alt. 750 m, 2–3 June 1994, Coll. Zeng T., 1 male. Guang-dong Province: Dacheng Town, an unnamed stream inside entrance of Da-wu-ling Nature Reserve, N22°16’25”, E111°11’38”, alt. 1021 m, 26 May 2004, Coll. Zhou X., 3 males, 4 females. All at light traps.
Distribution: Oriental Biogeographic Region, southern China (Zhe-jiang, Fu-jian, Guang-dong, Guang-xi, Yun-nan).
description: Published as part of Morse, John C., 2017, Lannapsyche and Marilia species of China (Trichoptera: Odontoceridae), pp. 81-99 in Zootaxa 4320 (1) on pages 88-90, DOI: 10.11646/zootaxa.4320.1.5, http://zenodo.org/record/891584