Gallerucida shirozui Kimoto

Lee, Chi-Feng, 2017, The genus Gallerucida Motschulsky in Taiwan (Insecta, Coleoptera, Chrysomelidae, Galerucinae), ZooKeys 723, pp. 121-151 : 141-143

Gallerucida shirozui Kimoto Figs 12 A–C, 13

Gallerucida shirozui Kimoto, 1969: 67 (Taiwan); Wilcox 1971: 206 (catalogue); Kimoto and Chu 1996: 92 (catalogue); Kimoto and Takizawa 1997: 392 (catalogue); Beenen 2010: 460 (catalogue); Yang et al. 2015: 176 (catalogue).

Type material.

Holotype ♂ (KUEC): "(Taiwan) / Sungkang / Nantou Hsien [p, w] // 1.VI. [h] 1965 / T. Shirôzu [p, w] // Gallerucida / shirozui / Kimoto, n. sp. [h, w] // HOLOTYPE [p, r]".

Diagnosis.

Gallerucida shirozui and G. thoracica Jacoby adults are easily recognized by their metallic elytra and reddish or yellowish brown pronota. Adults of Gallerucida shirozui differ from those of G. thoracica by possessing only one pair of black spots on the pronotum (two pairs in G. thoracica ) and longer and more serrate antennae (shorter and filiform antennae in G. thoracica ).

Redescription.

Length 7.2-8.2 mm, width 3.8-5.2 mm. General color (Fig. 12 A–C) reddish brown; antenna black except three basal antennomeres; pronotum yellowish brown with one pair of black spots at sides, brown between black spots; elytra entirely metallic green; tibiae, and tarsi black; each abdominal ventrite with one pair of black spots at sides, sometimes expanding inwards and connected medially. Antenna serrate in males (Fig. 13A), length ratios of antennomeres I–XI 1.0: 0.4: 0.4: 1.2: 1.0: 1.0: 1.0: 0.9: 0.9: 0.9: 1.1, length to width ratios of antennomeres I–IX 3.2: 1.2: 1.1: 3.3: 2.2: 2.2: 1.9: 1.9: 2.4: 2.4: 3.9; filiform and much shorter in females (Fig. 13B), length ratios of antennomeres I–XI 1.0: 0.4: 0.4: 0.8: 0.8: 0.7: 0.7: 0.7: 0.6: 0.6: 0.8, length to width ratios of antennomeres I–IX 3.4: 1.5: 1.6: 3.2: 2.6: 2.0: 1.8: 1.9: 1.7: 1.7: 2.0. Pronotum transverse, 2.0 × wider than long, disc convex, with oblique depressions at sides, medially abbreviated, disc with micro-reticulation and dense, coarse punctures; lateral margin straight or slightly rounded; apical margin concave; basal margin convex. Elytra parallel-sided; 1.4-1.6 × longer than wide, disc without micro-reticulation but with dense, coarse punctures arranged randomly; dorso-ventrally flattened. Penis (Fig. 13 C–D) elongate, 5.2 × longer than wide; parallel-sided; apex widely lanceolate; straight but apically curved in lateral view; ventral surface well sclerotized; endophallic sclerite complex (Fig. 13G) large, about 0.6 × as long as penis, composed of one median sclerite and one pair of lateral sclerites, median sclerite longitudinal, straight in lateral view, with dorsal processes at apical 1/5, with dense setae along apical margin of process, lateral sclerites longitudinal but much shorter, about 0.5 × as long as median sclerite, strongly curved near apex, apices concave. Gonocoxae (Fig. 13H) elongate, connected from base to basal 3/5, apices rounded, with dense elongate setae; base wide. Ventrite VIII (Fig. 13E) longitudinal, apical margin truncate but laterally membranous; with sparse short setae along and inside apical margin; spiculum extremely slender. Receptacle of spermatheca (Fig. 13F) strongly swollen; pump short but strongly curved; proximal spermathecal duct slender and shallowly inserted into receptacle.

Variation.

Females from southern Taiwan possess narrower antennae (length to width ratios of antennomeres I–IX 3.4: 1.4: 1.7: 3.3: 3.1: 2.3: 1.9: 2.0: 2.0: 2.0: 2.7) and reduced punctures on the pronota.

Host plant.

Vitaceae : Vitis flexuosa Thunb. (present study).

Biology.

Two mature larvae were collected on leaves of Vitis flexuosa in Meifeng during late June 2012. They burrowed into the soil shortly after collection and built underground chambers for pupation. Duration of the pupal stage was 25-28 days. Newly emerged adults were entirely yellow, and required three weeks to change color.

Other material examined.

TAIWAN. Kaoshiung: 1♂ (TARI), Shihshan trail [石山林道], 19-24.XI.2008, leg. C.-T. Yao; 1♀ (TARI), Tengchih [藤枝], 30.III.2009, leg. C.-T. Yao; 3♂♂ (BMNH), Tona trail [多納林道], 25.VII.2017, leg. B.-X. Guo; 1♂, 3♀♀ (TARI), same but with “2.VIII.2017”; Nantou: 1♂ (TARI), Meifeng [梅峰], 20.IV.2011, leg. T.-H. Lee; 1♂, 1♀ (TARI), same locality, reared from larvae, 29.VII.2012, leg. C.-F. Lee; Pingtung: 1♀ (TARI), Wutai [霧台], 18.III.2010, leg. J.-C. Chen.

Distribution.

Endemic to Taiwan.