Lepidostoma ishigakiense, Ito, Tomiko, 2016

Ito, Tomiko, 2016, The Lepidostoma coreanum Species Complex (Trichoptera, Lepidostomatidae) in the Asian Far East, Zootaxa 4061 (4), pp. 397-417 : 415-417

Lepidostoma ishigakiense sp. nov.

( Figs. 20 , 21 )

Diagnosis. Males of this species are similar to those of Lepidostoma niigataense sp. nov. ( Figs. 7–11 ), but are clearly discriminated from the later by the small rectangular projection on the laterocaudal corner the main article of each inferior appendage ( Fig. 20 E, G).

Male ( Fig. 20 ). Antennae about 5.0 mm long, each with scape setose, thick and long, about 1.5 times as long as head, short mesal process near middle. Maxillary palps setose, each 2-segmented, 0.8 mm long in total, long basal segment covered with short setae, short apical segment densely covered with long setae. Labial palps each 3- segmented, slender, 0.8 mm long in total.

Wings covered with fine setae, short scales, and spindle-like setae; spindle-like setae lining cubital area; forewings each with apical forks 1 and 2, discoidal and thyridial cells, and arculus, costa curved anteriorly, venation of caudal area complex ( Fig. 20 C); hind wings each with apical fork 1, venation of caudal area complex ( Fig. 20 D); forewings and hind wings each 4.2–4.6 mm long and about 4.0 mm long, respectively (n=3).

Genitalia. Abdominal segment IX short. Segment X composed of mesal and lateral arms; mesal arms elongate posteriorly, lateral arms subtriangular, about 1/2 as long as mesal arms, both pairs of arms blunt apically. Ventral arms completely absent. Inferior appendages each composed of main article, dorsal hook, and inner hook; basal half of main article broad in lateral and ventral views with serrate posterior margin and small rectangular projection at postero-lateral corner; apical half of main article bar-like, directed posteromesad with spiny apex; dorsal hook directed laterad with subacute setose apex; inner hook much shorter than dorsal hook, bar-like, directed lateroposterad in ventral view. Phallic apparatus thick, membranous in apical half, with inner U-shaped sclerite, paramere absent.

Female and immature stages. Unknown.

Holotype: Japan, Ryukyu Islands, Ishigaki-jma: 1 male, Ishigaki-shi, Shiramizu, small tributary of Naguragawa, 24˚24’46”N, 124˚09’51”E, 15 m, 17.x.2005, T. Ito (CBM-ZI 151265).

Paratypes. 2 males, same data as holotype (CBM-ZI 151266 – 151267).

Etymology. The specific name refers to the name of the type locality.

Distribution ( Fig. 21 ). Japan (Ryukyu Islands: Ishigaki-jima). Known from only the type locality.

Habitat. Adults were collected beside a small water flow (30 cm wide, 1 cm deep) in a forest.

Japanese name. Ishigaki-sunatsutsu-tobikera.

Figures

FIGURE 7. Lepidostoma niigataense, male and female, type specimens. A – H, Male: A, head, right scape and maxillary palp, right lateral; B, right scape, dorsal; C, right forewing, dorsal; D, right hind wing, dorsal; E, genitalia, left lateral; F, variation of segment X, left lateral; G, genitalia, dorsal; H, same, ventral. I – K, Female: I, abdominal segments VIII – X, left lateral; J, same, ventral, subgenital plate omitted; K, subgenital plate, ventral, posterior edge up. Abbreviations as in Fig. 1.

FIGURES 8, 9. Lepidostoma niigataense, male, variation, 8, specimen from Yamagata; 9, specimen from Miyagi. A, head, right scape and maxillary palp, right lateral; B, right forewing, dorsal; C, right hind wing, dorsal; D, genitalia, left lateral; E, same, ventral.

FIGURES 10, 11. Lepidostoma niigataense, male, variation. 10, specimen from Kanagawa; 11, specimen from Aichi. A, head, left scape and maxillary palp, left lateral; B, right forewing, dorsal; C, right hind wing, dorsal; D, genitalia, left lateral; E, same, ventral.

FIGURE 20. Lepidostoma ishigakiense, male, type specimen. A, head, right scape and maxillary palp, right lateral; B, left scape, dorsal; C, right forewing, dorsal; D, right hind wing, dorsal; E, genitalia, left lateral; F, same, dorsal; F, same, ventral. Abbreviations as in Fig. 1.

FIGURE 21. Distribution of the 5 species of the Lepidostoma coreanum Species Complex of the genus Lepidostoma. The plot in North Korea was referred from Kumanski & Weaver (1992).