Stenocranus tonghuaensis Ding, 2006

Fujinuma, Satoshi & Hayashi, Masami, 2025, Taxonomic revision of Japanese Stenocranus (Hemiptera: Fulgoromorpha: Delphacidae), Zootaxa 5706 (3), pp. 301-336 : 329

Stenocranus tonghuaensis Ding, 2006

[Japanese name: Hime-naga-unka]

( Figs 3 , 9 , 10 , 14 , 16 )

Stenocranus tonghuaensis Ding, 2006: 105 [ Type locality: China ( Jiling : Tonghua)].

Stenocranus akashiensis : Anufriev & Emeljanov, 1988: 345 (nec Matsumura, 1935).

Stenocranus akashiensis : Ijima, 2010: 14 (nec Matsumura, 1935).

Material examined. [ Hokkaido] 2♂ ( MH), Futatsuyama, Shibecha, 3. VI. 1997, K. Ijima; 4♂ 3♀ ( MH), Lake Shirarutoro, Shibecha , 19. IV. 1997, K. Ijima ; 2♀ ( MH), Onnenai, Tsurui , 29. VIII. 1995, T. Ichita; [ Honshu] 7♂ 6♀ ( SF), Kamitakamori, Tsukidate, Kurihara , Miyagi Pref. , 24. VII. 2022, S. Fujinuma; 3♂ 4♀ ( SF), Shimonamai, Oyama , Tochigi Pref. , 12. VII. 2014, S. Fujinuma; 4♂ 4♀ ( SF), same data except 19. IX. 2014, S. Fujinuma ; 8♂ 10♀ ( SF), Ibi Riv., Kaizucho-Fukuoka, Kaizu , Gifu Pref. , 20. II. 2011, S. Fujinuma.

Redescription. General coloration stramineous, in summer form strongly paler. Frons with dark stripes. Genae with dark stripes. Mid-dorsal parts of vertex, pronotum, and mesonotum narrowly whitish, fringed with orange and dark stripes (stripes usually lacking in summer form). Forewings usually without dark markings on apices of apical veins; dark stripes on membrane. Male pygofer pale to dark brown.

Vertex about 1.6× as long as wide. Frons about 2.8× as long as wide; median carina forked in apical 1/3. Antennal segment II about 2.7× as long as wide. Forewing venation and hind leg spinulation as in S. niisimai . Post-tibial spur with 16–21 fine teeth.

Body length (mean): ♂ 4.5–5.4 mm ( 4.9 mm); ♀ 5.0– 5.9 mm ( 5.5 mm).

Male genitalia: Similar to S. kisimotoi except pygofer slightly triangular in caudal view; gonostyles relatively broad in basal half in widest view; phallotheca broad in lateral view; opening on caudal side; two apical processes: left process long, falcate; right process long, bifurcated near midlength; anal tube without minute projections on ventral margin. Female genitalia: Similar to S. sapporensis except gonapophyses IX with 17–19 teeth, mostly symmetrically diverged. Gonoplacs semicircular in ventral view, broad, wider in apical half.

Distribution. Japan ( Hokkaido, Honshu) (new record), China.

Remarks. This species, hitherto known from China,is newly recorded from Japan.It is similar to S.chenzhouensis in habitus and genitalia but can be distinguished by the following features: forewings mostly without markings (with dark markings on apices of veins in S. chenzhouensis ), phallotheca with two apical processes, the right one bifurcated at midlength (right process just downcurved in S. tonghuaensis ). Some records identified as Stenocranus akashiensis Matsumura from Hokkaido ( Anufriev & Emeljanov 1988, Ijima 2010) are identical to those of this species based on the configuration of the male genitalia.

Biological notes. This species inhabits lowland to low mountainous marshes and feeds on Carex dispalata Boott ( Cyperaceae ). The oviposition site on the host plant is similar to that of S. harimensis . It is sometimes found together with S. harimensis , S. fallax , and S. chenzhouensis in the same sedge grasslands.

Figures

FIGURE 3. Habitus, faces, forewings, and hind legs of Stenocranus and Ceratocranus gen. nov. (all males). A, winter form; B, summer form.—A, B, E, S. tonghuaensis; C, F, L, C. agamopsyche; D, G, M, O, C. aurantius sp. nov.; H, S. niisimai; I, N, S. tamagawanus; J, S. kisimotoi sp. nov.; K, S. takasagonis. Scales: 1.0 mm (A–D, H–M), 0.5 mm (N, O).

FIGURE 9. Male genitalia of Stenocranus and Ceratocranus gen. nov. in lateral view.—A, S. niisimai; B, S. tamagawanus; C, S. sapporensis; D, S. harimensis; E, S. tateyamanus; F, S. kisimotoi sp. nov.; G, S. takasagonis; H, S. fallax; I, S. chenzhouensis; J, S. tonghuaensis; K, C. agamopsyche; L, C. aurantius sp. nov. Scales: 0.2 mm.

FIGURE 10. Male genitalia of Stenocranus and Ceratocranus gen. nov. in ventrocaudal view.—A, S. niisimai; B, S. tamagawanus; C, S. sapporensis; D, S. harimensis; E, S. tateyamanus; F, S. kisimotoi sp. nov.; G, S. takasagonis; H, S. fallax; I, S. chenzhouensis; J, S. tonghuaensis; K, C. agamopsyche; L, C. aurantius sp. nov. Scales: 0.2 mm.

FIGURE 14. Male genitalia (A–J) and female genitalia (K–M) of Stenocranus and Ceratocranus gen. nov. A–C, phallotheca in lateral view; D–F, same in ventral view; G, suspensorium in anterior view; H–J, gonostyle in widest view; K–M, gonoplac in ventral view.—A, D, H, K, S. tonghuaensis; B, E, I, L, C. agamopsyche; C, F, G, J, M, C. aurantius sp. nov.

FIGURE 16. Oviposition holes and eggs of stenocranine genera on plants. A, D, oviposition holes covered with wax; B, E, G, the holes removed wax; C, F, H, K, N, P, eggs in the holes.—A–C, S. fallax on Carex dispalata; D–F, S. chenzhouensis on C. dispalata; G, H, S. tonghuaensis on C. dispalata; I–K, C. agamopsyche on Phragmites australis; L–N, T. singularis on P. australis; O, P, P. yasumatsui (Ishihara) on Carex sp.