Dercetina itoi Kimoto, 1969

Lee, Chi-Feng & Bezdek, Jan, 2013, Revision of the genus Dercetina from Taiwan and their similar species, with description of a new species from Myanmar (Insecta, Chrysomelidae, Galerucinae), ZooKeys 323, pp. 1-33 : 9-13

Dercetina itoi Kimoto, 1969

Dercetes flaviventris : Weise 1922: 94 (Taiwan; misidentification); Chûjô 1962: 143 (redescription).

Dercetina itoi Kimoto, 1969: 64 (Taiwan); Kimoto 1987: 190 (Taiwan).

Type series.

Holotype ♀ (KUEC): "(Taiwan) Alishan, 2300m Chiayi Hsien / 6.vii.1965 S. Ito / Japan-U. S. Co-op. Sci. Programme (yellow label) / HOLOTYPE (red label) / Dercetina itoi Kimoto, n. sp.". Paratypes: 1 ex. (KMNH): "(Taiwan) Sungkang Nantou Hsien / 31.v.1965 T. Shirôzu / PARATYPE (blue label) / Dercetina itoi Kimoto, n. sp."; 1 ex. (KMNH): "(Taiwan) Sungkang, 2000m - Tsuifeng, 2300m Nantou Hsien / 29.vi.1965 S. Kimoto / Japan-U. S. Co-op. Sci. Programme (yellow label) / PARATYPE (blue label) / Dercetina itoi Kimoto, n. sp."; 1 ex. (KMNH): "[Formosa] Oiwake (Tsuifeng in Nantou county) 2,300 m 4.V.1965 T. Shirôzu / PARATYPE (blue label) / Dercetina itoi Kimoto, n. sp.".

Material examined.

TAIWAN: 6♂♂, 4♀♀, Ilan, Ssuyuan, 25.IV.2009, leg. C.-F. Lee (TARI); 6♂♂, 12♀♀, same locality, 25.IV.2009, leg. M.-H. Tsou (TARI); 1♀, same locality, 9.VI.2009, leg. S.-F. Yu (TARI); 1♀, same locality, 6.V.2011, leg. S.-F. Yu (TARI); 1♀, Hohuanshan, 17.V.2009, leg. C.-F. Lee (TARI); 1♀, Nantou, Meifeng, 7-9.V.1981, leg. K. S. Lin & S. C. Lin (TARI); 1♀, same locality, 24-26.VI.1981, leg. K. S. Lin & W. S. Tang (TARI); 1♀, same locality, 22.V.1982, leg. L. Y. Chou (TARI); 1♀, same locality, 3.VII.2008, leg. M.-H. Tsou (TARI); 1♂, same locality, 20.IV.2011, leg. C.-F. Lee (TARI); 2♂♂, 2♀♀, same locality, 30.V.2011, leg. M.-H. Tsou (TARI); 1♀, Nantou, Tatachia, 9.VI.2009, leg. C.-F. Lee (TARI); 1♂, same locality, 20.VII.2009, leg. S.-F. Yu (TARI); 1♂, same locality, 21.IX.2009, leg. C.-F. Lee (TARI); 1♂, 4♀♀, same locality, 17.V.2010, leg. C.-F. Lee (TARI); 1♂, Nantou, Tsuifeng, 3.VI.1980, leg. L. Y. Chou & C. C. Chen (TARI); 2♂♂, 6♀♀, same locality, 8.V.1981, leg. K. S. Lin & S. C. Lin (TARI); 2♀♀, same locality, 25-27.VI.1981, leg. K. S. Lin & W. S. Tang (TARI); 1♂, 4♀♀, same locality, IV.1984, leg. K. S. Lin & K. C. Chou (TARI); 1♀, same locality, 23.VII.1984, leg. K. S. Lin (TARI); 2♂♂, 3♀♀, Nantou, Tungfu, 8.V.2011, leg. C.-F. Lee (TARI); 2♂♂, Nantou, Musha (= Wushe), 18.V.-15.VI.1919, leg. T. Okuni (TARI); 2♀♀, same locality, 6-11.V.1981, leg. K. S. Lin & S. C. Lin (TARI); 4♂♂, 3♀♀, Taichung, Pilu, 17.V.2009, leg. C.-F. Lee (TARI); 6♂♂, same locality, 17.V.2009, leg. M.-H. Tsou (TARI); 2♂♂, 1♀, Taoyuan, Lalashan, 1-2.IV.2009, leg. C.-F. Lee (TARI); 2♀♀, same locality, 14.V.2009, leg. C.-F. Lee (TARI).

Diagnosis.

Dercetina itoi is characterized by its metallic purple color. Some individuals of Dercetina shirozui with blackish brown legs are similar to Dercetina itoi in color pattern. Dercetina itoi can be separated from Dercetina shirozui by the tiny punctures on the pronotum (in contrast with the prominent puncures on the pronotum in Dercetina shirozui ).

Redescription.

Color (Figs 3-4) dark metallic purple, antennae and legs blackish brown, abdomen yellowish brown. Antennal calli separated by deep furrow; vertex with distinct punctures, disc shagreened. Pronotum 1.6-1.7 times wider than long, disc evenly convex, with scattered fine punctures, and a pair of deep round fovea at sides; lateral margin straight, narrowed posteriorly, anterior margin straight, posterior margin slightly rounded. Elytra more or less widened posteriorly, apex convergently rounded, 1.6-1.7 times longer than wide, disc with densely prominent punctures; epipleurae impunctate, somewhat rugose.

Male. Length 5.1-5.3 mm, width 2.4-2.6 mm., Antennomeres VIII-XI filiform, ratio of length of antennomeres III to XI about 1.0: 1.5: 1.4: 1.3: 1.4: 1.5: 1.6: 1.5: 1.9; ratio of length to width of antennomeres III to XI about 2.4: 3.6: 3.0: 2.7: 2.9: 3.5: 3.7: 3.5: 4.0 (Fig. 36). Penis (Fig. 38) slender, about 7.7 times longer than wide, parallel-sided, apically and basally widened, apex broadly rounded; tectum membranous, with scattered stout setae; weakly curved in lateral view (Fig. 39); endophallic sclerite elongate, about 0.7 times as long as penis, apex pointed, and recurved in lateral view, with a cluster of setae near apex; dorsal sclerite with base deeply bifurcate, narrower than ventral sclerite, base bifurcate, in lateral view weakly curved.

Female. Length 5.9-6.6 mm, width 3.0-3.3 mm. Ratio of length of antennomeres III to XI about 1.0: 1.4: 1.3: 1.3: 1.4: 1.4: 1.4: 1.3: 1.8; ratio of length to width of antennomeres III to XI about 2.7: 3.3: 3.2: 3.0: 3.2: 3.1: 3.2: 3.1: 4.1 (Fig. 37). Sternite VIII (Fig. 40) weakly sclerotized subapically, apex truncate, with few setae along apical margin, spiculum extremely long. Spermathecal receptaculum (Fig. 42) weakly swollen; pump narrow and strongly curved, apex pointed; spermathecal duct long, deeply projecting into receptaculum. Gonocoxae (Fig. 41) narrowly connected at middle, about 4.8 times longer than wide, curved inwards at apical 1/3, with one short setae at apical 1/3, ten or eleven setae at apex.

Host plants.

Sabiaceae : Sabia transarisanensis Hayata; Stachyuraceae : Stachyurus himalaicus Hook. f. & Thomson ex Benth.

Distribution.

Taiwan. It is widespread in high mountains (above 2000 m) (Fig. 13).