Pseudoleptonema tansungnerni, Laudee, Pongsak & Malicky, Hans, 2017

Laudee, Pongsak & Malicky, Hans, 2017, Pseudoleptonema tansoongnerni new species (Hydropsychidae: Trichoptera) with species list of Trichoptera from Li Phi Falls, Mekong River, southern Laos, Zootaxa 4242 (2), pp. 383-391 : 384-386

Pseudoleptonema tansungnerni n. sp.

( Figs. 1–8 , 11–12 )

Type material. Holotype male (PSUNHM). Laos: Muang Khong Village , Don Klon Island , Li Phi Falls, Mekong River, 13°57’27”N, 105°55’27”E, 77 m a.s.l., 16 April 2016, leg. Pongsak Laudee .

Paratypes: Same data as holotype, 54 males and 39 females: 4 males and 4 females (CHM), 20 males and 20 females (CPL), 10 males and 10 females (PSUNHM), and 20 males and 5 females (CUAC).

Etymology. Named for Asst. Prof. Jaroon Tansoongnern, Dean of the Faculty of Liberal Arts and Management (during 2010-2012), Prince of Songkla University, Surat Thani Campus.

Description. Length of each male forewing 8–9 mm (n = 5); length of each female forewing 6–6.5 mm (n = 5); specimens in alcohol with head, thorax, and abdomen yellowish; wings yellowish brown with dark brown markings.

Male genitalia ( Figs. 1–4 ). In lateral view ( Fig 1 ), segment IX (IX) vertically elliptical, longitudinally short dorsally and ventrally and long laterally, anterior margin convex, posterior margin nearly straight; preanal appendages (Pre) small, triangular with long setae; segment X triangular with small setae apically, ridge and small setae apicoventrally. Inferior appendages about 1.5 times as long as segment X, divided into 2 parts equally long, basal part (Ba Inf) thicker than apical part (Ap Inf); phallus axe-like, vertically enlarged basally, slender in middle, bulging apically with pointed spine apicoventrally. In dorsal view ( Fig 2 ), preanal appendages squat, subrectangular, with long setae apically; segment X subrectangular with V-shape incision apically for 1/3 of its length, diverging branches rounded apically. In ventral view ( Fig. 3 ), basal segments of inferior appendages cylindrical with long setae laterally, apical segments thinner than basal segments, curved inward and with numerous short setae; phallus clavate, bulky apically.

Male forewings yellowish brown, with 4 transparent bands crossing or nearly crossing wing from anterior to posterior, subapically with fist-like transparent area surrounded by dark brown area, this dark color extending basad in median vein ( Figs. 5 , 11 ).

Female genitalia ( Figs. 6–7 ). In lateral view ( Fig. 6 ), segment X yellowish with row of long setae marginally. Segment XI with 2 dorsal and 1 ventral papillae widely separated, small setae marginally. In ventral view ( Fig. 7 ), segment X oval with long and short setae marginally. Ventral plates with numerous long setae anterior marginally, connected at its base.

Female forewings yellowish brown with transparency band and small dark brown area ( Figs. 8 , 12 ).

Diagnostic. The male and female genitalia of P. tansoongnerni n. sp. appear very similar to those of P. quinquefasciatum . However, these species can be very easily distinguished by the following characteristics: 1) the body of P. quinquefasciatum is black, but the body of P. tansoongnerni n. sp. is yellowish brown; 2) the forewing color and wing pattern of P. quinquefasciatum is black with white bands, but the male and female forewings of P.

tansoongnerni n. sp. are yellowish brown and black with a pattern similar to that of P. quinquefasciatum but with a large transparent region subapically not seen in P. quinquefasciatum . Photographs of male and female forewings of Pseudoleptonema quinquefasciatum , P. tansoongnerni , and P. supalak are provided for comparison ( Figs. 9–14 ).

Figures

FIGURE 5. Male right forewing of Pseudoleptonema tansoongnerni n. sp., dorsal.

FIGURE 8. Female right forewing of Pseudoleptonema tansoongnerni n. sp., dorsal.

FIGURES 1 – 4. Male genitalia of Pseudoleptonema tansoongnerni n. sp. 1, left lateral; 2, dorsal; 3, ventral; 4, phallus, ventral. Ap Inf = apical segment of an inferior appendage (paired), Ba Inf = basal segment of an inferior appendage (paired), IX = abdominal segment IX, Pha = phallus, Pre = preanal appendage (paired), X = abdominal segment X.

FIGURES 6 – 7. Female genitalia of Pseudoleptonema tansoongnerni n. sp. 6, left lateral; 7, ventral. IX = abdominal segment IX, VP = ventral plate (paired), X = abdominal segment X.

FIGURE 9 – 14. Right forewing of Pseudoleptonema spp. 9, male right forewing of P. quinquefasciatum. 10, female right forewing of P. quinquefasciatum. 11, male right forewing of P. tansoongnerni. 12, female right forewing of P. tansoongnerni. 13, male right forewing of P. supalak. 14, female right forewing of P. supalak.