Setodes pokamest, Malicky & Ivanov & Melnitsky, 2020

Malicky, Hans, Ivanov, Vladimir D. & Melnitsky, Stanislav I., 2020, New Caddisflies (Insecta, Trichoptera) from the Krabi and Phang Nga Provinces southern Thailand, Zootaxa 4729 (3), pp. 401-415 : 407-409

Setodes pokamest , new species ( Fig. 6 A–6F)

Holotype: male. Completely light yellow except for black eyes. No color patterns on wings visible in insects preserved in alcohol. Hind wing vein M with 2 branches (MA and MP). Length of each forewing 5.5 mm.

Male genitalia. Ventral part of segment IX in lateral view triangular and strongly extended caudad; dorsal part longitudinally short and protruding slightly anterad. Segment X deeply divided into two long acute widely separated projections extending beyond ventral projection of segment IX in lateral view. Superior appendages about half as long as segment X projections, widely fused to segment IX, blunt apically. Inferior appendages with some asymmetry on ventralview: The right appendage with longer medial projection and less prominent terminal notch inventral view; in lateral view each appendage with large ventral part three-lobed apically. Medioventral lobe of each inferior appendage extends caudad, and two others directed dorsocaudad; dorsomesal proximal lobe narrow in lateral view, broader in ventral view, andlateral lobe wider than the other two lobes. Basal part of each inferior appendage with long slender dorsal process directed anterodorsad basally and then curved posterodorsad, additional mesal process posterior to long process directed posterodorsad and provided with two basal teeth each bearing apical seta. Phallic complex very large, directed dorsad at base and then forming large arc so that apical part of complex turned downwards, approaching ventral part of inferior appendages; composed of two narrow foliaceous and apically acute parameres and slender tube- like phallus between them, parameres antisymmetrical and crossing each other ( Figs. 6E, 6F ); apically directed laterad in parallel; orientation of apical parts to right (as in holotype) or to left; in 35 studied specimens orientation to right in 23 and to left in 12.

Diagnosis. The male genitalia of this species described above is similar to those of Setodes melpomene Malicky & Chantaromongkol 2006 , in that the phallic complex is very similar ( Figs. 6G, 6H ), and its apical parts also are antisymmetrical, directed either to the right or to the left; 9 studied specimens showed 2 right- and 7 left-oriented parameres. However, the latter has no long, acute caudal projections of segment X and the ventral part of each inferior appendage is not three-lobed, but approximately quadrangular ( Malicky 2010, p. 322). Other similar species, S. likymnios Malicky & Nuntakwang 2006 (in Malicky & Chantaramongkol 2006) differs in simplified gonopods with fewer projections, in more-slender parameres, and in acute caudal projections of segment X more robust and curved ventrad.

Holotype: THAILAND, Krabi Province, 40 km SE from Krabi, small river, 07º55’46”N, 99º13’24”E, height 30 m, UV light traps, 3 February 2014, leg. Melnitsky, Ivanov.

Paratypes: 39 males from the same locality .

Distribution. Thailand (known only from type locality).

Etymology. An indeclinable name with gender agreement irrelevant, from the Russian pokamest (meanwhile).

Figures

FIGURE 6. Male genital structures of Setodes spp. 6A–6F, Setodes pokamest new species: 6A, genitalia, left lateral; 6B, genitalia, dorsal; 6C, genitalia, ventral; 6D, phallus, dorsal; 6E, phallus, left lateral; 6F, phallus, right lateral. 6G–6H, Setodes melpomene Malicky & Chantaromongkol, phallus: 6G, left lateral; 6H, right lateral.