Ceraclea (A.) trisdikooni Laudee & Malicky, 2017

Laudee, Pongsak, Seetapan, Kriengkrai & Malicky, Hans, 2017, Three new species of Ceraclea Stephens 1829 (Trichoptera: Leptoceridae) from Southeast Asia, Zootaxa 4362 (2) : -

Ceraclea (A.) trisdikooni Laudee & Malicky , n. sp.

Figs. 1–4 .

Type material. Holotype male ( PSUNHM). Myanmar: Shan State, Keng Tung Province, Naw-awn, Salwin River , 21°13’ 46”N, 98°42’32”E, ca. 251 m a.s.l., 0 4 May 2015, leg. Sai Aye.

Paratypes: Same data as holotype, 10 males (PSUNHM) , 2 males ( CUAC, database number CUAC 000044768 ). Myanmar: Shan State, Keng Tung Province, Nam Lok Stream , 21°22’50”N, 99°00’ 49”E, 442 m a.s.l., 0 3 May 2015, leg. Sai Aye, 10 males ( CHM) .

Etymology. Dedicated to Assoc. Prof. Dr. Piti Trisdikoon who was Vice President of Prince of Songkla University, Trang Campus, during 2008–2013.

Description. Length of each male forewing 7–8 mm (n = 8), antennal length 16–17 mm, specimens in alcohol with head and thorax dark brown, mesoscutum dark brown in middle and light brown laterally, forewings light brown, abdomen light brown with dark brown terga.

Male genitalia ( Figures 1–4 ). In lateral view ( Fig. 1 ), segment IX forming isosceles triangle, rounded ventrally and dorsally; preanal appendages subtriangular, nearly as long as segment X, each with ventral margin concave and directed caudad apically; segment X somewhat triangular, ventral margins broadly rounded, upturned, blunt apically, with short subapicodorsal setae and long subapicoventral setae, ridged apicoventrally; basal segment of each inferior appendage shaped like elephant tusk (directed dorsad basally and recurved caudad and ventrad apically), with numerous long setae basomesally, long setae at midlength dorsally, and short setae apically; harpago cylindrical, inserted subbasoventrally on basal segment of each inferior appendage, slender, with apical setae. In dorsal view ( Fig. 2 ), preanal appendages concave laterally, basally fused, with deep V-shaped incision between them for nearly half of their length; segment X slightly longer than preanal appendages, with small apical incision and very short, stout subapical setae. In ventral view ( Fig. 3 ), basoventral lobe of basal segment of each inferior appendage oval, with numerous of long setae; subapicodorsal lobe cylindrical, bent mesad, and with numerous setae apically; each harpago curved mesad and with two setae apically. In lateral view ( Fig. 4 ), phallus elongateoval, convex dorsally and concave ventrally, with 2 dark, spear-like phallic spines curved slightly caudoventrad apically, membranous apicodorsally, with pair of sclerotized folds apicoventrally.

Diagnosis. The new species is a member of subgenus Athripsodina Kimmins 1963 ( Morse 1975). The male genitalia of the new species are similar to those of several other species found in Southeast Asia including C. troilos Malicky 2006 from Vietnam; C. hektor Malicky & Bunlue 2004 (in Malicky et al. 2004) from Thailand; C. itoae Malicky 2006 from Cambodia; C. hersilia Malicky & Changthong 2002 (in Malicky et al. 2002) from Laos and Thailand; C. helena Malicky & Laudee 2002 (in Malicky et al. 2002) from Laos, Thailand, and Vietnam; C. hebe Malicky & Sompong 2002 (in Malicky et al. 2002) from Thailand; and C. herse Malicky 2002 (in Malicky et al. 2002) from Laos. All of these species including the new species have a similar lateral view of their genitalia, especially the peculiar caudad curvature of the long basal segment of each inferior appendage. Ceraclea trisdikooni n. sp. is distinguished from these species by its inferior appendages recurved ventrad nearly 180° apically. The preanal appendages of the new species are separated apically by a deep V in dorsal view, unlike very similar C. hektor and C. hebe that have the preanal appendages separated by a broad U-shaped excision. The apex of the basal segment of each inferior appendage is more pointed in the new species than in C. hektor , in which it is truncate, or in C. hebe , in which it is rounded. The harpago of each inferior appendage in the new species is longer and more slender than in C. hebe ; in C. hektor it is absent. In ventral view, each inferior appendage of the new species has an obvious basoventral lobe with numerous long setae, but no such lobe is present in C. hebe and C. hektor .

Figures

FIGURES1–4.Male genitalia of Ceraclea (A.) trisdikoonin.sp. 1, genitalia, left lateral; 2, segment IX, dorsal; 3, segment IX, ventral; 4, phallus, left lateral.Hap = harpago(paired), Inf = inferior appendages(paired), Pre= preanalappendages (paired), X = segment X.