Setodes lertpongsombatae Laudee and Malicky, 2018

Laudee, Pongsak & Malicky, Hans, 2018, Five new species of Caddisflies (Trichoptera: Insecta) from Upper Tenasserim Range, Thailand and Myanmar, Zootaxa 4524 (3), pp. 351-358 : 356-357

Setodes lertpongsombatae Laudee and Malicky n. sp.

Figs. 22–26 .

Type material. Holotype male ( PSUNHM). Myanmar: Tanintharyi Division, Myeik Province, Tanintharyi, Ngawun Chaung River , 12°03’49”N, 99°00’57”E, ca. 15 m a.s.l., 18 November 2016, leg. Pongsak Laudee.

Paratypes: Same data as holotype, 36 males: 10 males ( PSUNHM), 10 males ( CHM), 10 males ( CUAC); Myanmar: Tanintharyi Division, Myeik Province, stream near Yin Nhung Waterfall , 12°27’50”N, 98°42’30”E, ca. 58 m a.s.l., 19 November 2016, leg. Pongsak Laudee , 4 males ( PSUNHM); Tanintharyi Division, Myeik Province, Tanintharyi Bridge , 12°05’27”N, 99°00’38”E, ca. 24 m a.s.l., 16 November 2016, leg. Pongsak Laudee, 30 males ( NMPC), 30 males ( PSUNHM) .

Etymology. Named for Assoc. Prof. Imjit Lertpongsombat who is Vice President of Prince of Songkla University, Pattani Campus.

Description. Length of each male forewing 4.0–5.5 mm (n = 12); specimens in alcohol with head, thorax, and forewings dark brown; abdomen white.

Male genitalia ( Figures 22–26 ). Segment IX semicircular in lateral view with round anterior margins; posterior margins convex subventrally; in dorsal view membranous mesally; in ventral view rectangular with anterior margin broadly and shallowly concave and posterior margin with prominent trifurcate process. Preanal appendages semicircular in lateral view and crescentic and concave laterally in dorsal view, with small setae. Segment X with single dorsal spine and then deeply divided into pair of complex projections, in lateral view each projection trapezoidal basally, deeply divided into 2 very long saber-like blades: Upper blade straight and bifurcate apically, lower blade directed ventrad basally and then curved and pointed caudad; in dorsal view basal portion hourglasslike with short acute spine posteromesally, distal portion bifurcating into pair of long blade-like spines straight and convergent apically. Inferior appendages in lateral view square with posteroventral spine; in ventral view oval, each with large, pointed apical spine directed caudomesad. In lateral view, phallus long, larger basal part curved downward then apical part with pair of pointed projections directed caudad and pointed apically; in ventral view long and rectangular basally, slender and blunt apically, with deep V-shaped incision apically separating pair of pointed projections.

Diagnosis. The male genitalia of S. lertpongsombatae n. sp. appear similar to those of S. guptapara Malicky 1979 , found in the Andaman Islands. These share the character that the apical part of each half of segment X is deeply divided subapically into 2 very long saber-like blades in lateral view, at least on one side. However, the apical part of segment X is asymmetrical in S. guptapara , deeply divided on only the left side and the upper saberlike blade of the divided half is more curved and obviously thicker than for the new species, in which the upper blade is slender and straight. In ventral view, the prominent process on the posterior margin of segment IX of S. lertpongsombatae n. sp. is trifurcate but not in S. guptapara . Also, the inferior appendages of the new species each have a single claw-like spine apically, whereas those of S. guptapara each have two shorter spines apically.

Figures

FIGURES 22–26. Male genitalia of Setodes lertpongsombatae n. sp. 22, left lateral; 23, dorsal; 24, ventral; 25, phallus, left lateral; 26, phallus, ventral. Inf = inferior appendage (paired), IX = segment IX, Pre = preanal appendage (paired), X = tergum X.