Anisocentropus (Anisocentropus) pallidus ( Martynov 1935 )

Ito, Tomiko, Hayashi, Yumiko & Shimura, Noriyoshi, 2012, The genus Anisocentropus McLachlan (Trichoptera, Calamoceratidae) in Japan, Zootaxa 3157, pp. 1-17 : 9-11

Anisocentropus (Anisocentropus) pallidus ( Martynov 1935)

( Figs. 6 , 8 , 9 )

Ganonema pallidum Martynov 1935 , 214–217, figs. 8–11, male, Russian Far East (Amur).

Anisocentropus pallidus: Lepneva 1971 , 501–506, figs. 656–661, larva, case, Russian Far East (Primorye); Arefina & Levanidova 1997, 153, figs. 9–11, male, Russian Far East (Khabarovsk, Primorye).

Anisocentropus immunis: Ulmer 1907 , 53–54, figs. 80–82, Japan (unknown locality). Misidentification.

Anisocentropus (Anisocentropus) kawamurai: Oláh & Johanson 2010 , 16–18, figs. 17–21, male, Japan (Hokkaido). Misidentification.

Anisocentropus sp. 1: Kuhara et al. 2000, 249–250, Japan (Hokkaido).

Anisocentropus sp.: Ito et al. 2010, 65, 77, 85, Japan (Hokkaido).

Adult ( Figs. 6 , 8 B). Brown, abdomen orange in fresh specimens, length 6.0–10.0 mm in male and about 8 mm in female. Warts on head and thorax, maxillary palpi, labial palpi and antennae as in A. (A.) kawamurai .

Forewings ( Figs. 6 A, 8B) brown covered with fine brown hairs, each with fine hairs darker at posterior area in fresh specimens; 9.0–11.5 mm long in male and 9.5–12.5 mm long in female. Hindwings ( Figs. 6 A, 8B) brown in preserved specimens, grayish black in fresh specimens, 6.0–8.0 mm long in male and 6.5–8.0 mm long in female; other characters as in A. (A.) kawamurai .

Male genitalia ( Fig. 6 ). Tergite and sternite of segment IX ( Fig. 6 B) fused laterally; lateral margins produced posteriorly into somewhat triangular lateral lobe on each side; lateral lobe acute or subquadrate in some specimens ( Fig. 6 D). Median process of segment IX slender in dorsal and lateral views, with few very short setae. Roof-like plates of segment X compressed somewhat dorsolaterally with mesal notch and few short setae; posterolateral margins acute, heavily sclerotized and directed slightly ventrad ( Fig. 6 E). Preanal appendages ( Figs. 6 B, C) compressed laterally, long oval, with subacute apices in lateral view, rod-like in dorsal view, with many short and long setae laterally. Phallus ( Figs. 6 B, F) thick and short, with U-shaped phallotremal sclerite. Inferior appendages ( Figs. 6 B, G) branchless, slender, gradually tapered distally with subacute apices, covered with many short and long setae.

Female genitalia ( Fig. 6 ). Segment VIII ( Figs. 6 H, I) with subquadrate tergite and sternite, sternite with deep mesal cleft and many setae. Segment IX ( Figs. 6 H, I) somewhat depressed; tergite and sternite touching each other ventrolaterally; sternite semicircular with distinct medial slit and many gently curved striations; tergite with small, roundish or subtriangular protuberance along each posterolateral margin, posteroventral margins truncate in ventral view ( Fig. 6 I, arrow). Segment X ( Figs. 6 H, I) fused with segment IX, covered with many setae. Vaginal sclerite ( Figs. 6 K, J) sub-hexagonal with narrow proximal end in ventral view.

Pupa. Length up to 12 mm. Number of hooks of each anterior hook plate 2–4 (mostly 4), and that of each posterior hook plate 5–6. Other characters as in A. (A.) kawamurai .

Final instar larva ( Fig. 6 ). Length up to 17 mm. Head ( Figs. 6 L, M) slightly oblong, width 1.05–1.15 mm at cheeks; pale brown with small dark dots primarily along sutures and behind eye spots ( Figs. 6 L, M). Hind legs ( Fig. 6 N) light brown with dark bands on each femur, basal half of tibia, and sometimes on tarsus, but not on apical half of tibia. Other characters as in A. (A.) kawamurai .

Case. Similar to A. (A.) kawamurai .

Specimens examined. JAPAN. Hokkaido: Sarufutsu-mura, Kamuito-numa, 8.vii.2005, M. Nakatani, 2 males; ibid., 31.vii.2007, TI, S, 1 male; Chitose-shi, Bibi-gawa, Chitose-ko, 29.iii.1992, TI, 1 larva; ibid., 26.vii.2007, TI, S, 8 males, 2 females; 20.ix.2010, TI, 20 larvae; ibid., 8.vi–27.vii.2011, TI, S, 9 males, 11 females; ibid., 12.v– 15.vi.2011 (larvae), reared and emerged (or preserved) in vi–vii.2011, TI, 10 males, 21 females, 1 pupa (5 males pinned, others in alcohol). Tomakomai-shi, Bibi-gawa, Uenae-bashi, 15.x.1977, T. Hattori, 2 larvae; ibid., 22.vii.2001, TI and AO, L, 1 female; ibid., 3.viii.2007, TI, 1 male, 1 female; Tomakomai-shi, Hakucho-ko, 19.vi.1988, TI, 4 pupae, 4 larvae; ibid., 19.vi.1999 (pupae), reared and emerged in vi.1999, TI, 2 males, 1 female; Atsuma-cho, Ueno, Matsuno-numa, 28.vii.2006, NK (NK), P, 3 males; ibid., 15.ix.2006, NK (NK), P, 1 female; Nanae-cho, Onuma, Tsukimi-bashi and Konuma-hokugan, 23.vi.2003, TI et al., S and L, 3 males. Honshu. Miyagi: Onoda-cho, Arasawa-shitsugen, 6.x.2001, TN (TN), 1 larva. Kyoto: Midoroga-ike, 30.iv.1980 (larvae), reared and emerged in v.1980, TI, 2 males, 1 female. Okayama: Saeki-cho, Taga, pond, 9.iv.1997, TN (TN), 1 larva; Saeki-cho, Taga, Nature Conservation Center, Heisei-ike, 9.iv.1997, AO, 1 larva. Hiroshima: Kozan-cho, Otani-gawa, Hattabara Dam, 23.v.2000, S. Nakamura (TN), 1 male, 1 female.

Remarks. This species is very similar to A. (A.) kawamurai , but is clearly distinguished from the latter as in the remarks for A. (A.) kawamurai . Males illustrated by Ulmer (1907), under the name of A. immunis McLachlan 1863 , from an unknown Japanese locality, and by Oláh and Johanson (2010, figs. 17–21) under the name of A. (A.) kawamurai from Hokkaido, Japan, are undoubtedly A. (A.) pallidus based on the slender lateral aspect of the median process of segment IX. The unknown female and pupa of this species are described here.

Distribution ( Fig. 9 ). Japan (Hokkaido, Honshu), Russian Far East (Khabarovsk, Primorye).

Japanese name. Usuiro-koban-tobikera (newly given here).

Figures

FIGURE 6. Anisocentropus (A.) pallidus male, female and larva. Male (A – G): A, right wings, dorsal; B, genitalia, left lateral; C, same, dorsal; D, 2 variations of posterior margin of segment IX, left lateral; E, segment X, ventral; F, phallus, ventral; G, right inferior appendage, ventral. Female (H – K): H, genitalia, left lateral; I, same, ventral (for explanation of arrow, see text); J, vaginal sclerite, ventral; K, same, left lateral. Larva (L – O): L, head, dorsal (setae not illustrated); M, same, right lateral (setae not illustrated); N, right hind leg, dorsal; O, right hind tibia, ventral.

FIGURE 8. Right wings of the 3 species, dorsal. A, Anisocentropus (A.) kawamurai (type locality, Nagano, Kizaki-ko, 2011); B, Anisocentropus (A.) pallidus (Hokkaido, Chitose-ko, 2011); C, A Anisocentropus (A.) magnificus (Ishigaki-jima, 2011).

FIGURE 9. Distribution of the 3 species. Plots in Russia, China, and Indochina Peninsula are mainly from Arefina & Levanidova (1997), Yang et al. (2005, as A. minutus) and Malicky (2010, as A. minutus), respectively.