Gonioctena (Asiphytodecta) subgeminata (Chen, 1934)

Lee, Chi-Feng & Hsieh, Chia-Hung, 2022, Integrative taxonomy of the leaf-beetle genus Gonioctena Chevrolat, 1836 in Taiwan (Coleoptera, Chrysomelidae, Chrysomelinae, Gonioctenini) reveals new synonymies and one new species, ZooKeys 1120, pp. 1-46 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.1120.87526
publication LSID	lsid:zoobank.org:pub:711E0A82-82AB-43B5-9CC4-89BD87955061
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scientific name	Gonioctena (Asiphytodecta) subgeminata (Chen, 1934)
status

Treatment

Figs 2A-C View Figure 2 , 3 View Figure 3 , 4 View Figure 4

Phytodecta subgeminatus Chen, 1934: 75 (China: Guandong, Guanzhou).

Phytodecta (Asiphytodecta) subgeminatus : Chen 1935: 131 (catalogue); Chen 1936: 88 (catalogue); Chûjô 1958: 67 (Taiwan).

Asiphytodecta subgeminatus : Chen and Young 1941: 208 (key).

Gonioctena (Asiphytodecta) subgeminata : Gressitt and Kimoto 1963: 365 (China: Guandong); Kippenberg 2010: 432 (catalogue); Yang et al. 2015: 54 (China: Hunan, Zhejiang); Cho 2021 (China: Anhui, Jiangxi, Sichuan).

Gonioctena (Asiphytodecta) subgeminatus : Kimoto and Chu 1996: 52 (catalogue); Kimoto and Takizawa 1997: 369 (catalogue).

Gonioctena subgeminata : Takizawa et al. 1995: 7 (additional records in Taiwan)

Types.

Two syntypes should be deposited at the MNHUB but appear to be lost ( Cho 2021).

Other material (n = 60).

China. Fujian: 1♂ (TARI), 建陽 ( Jianyang ), 黃坑 (Huangkeng), 場头 (Changtou), 700-950m, 23.VI.1960 , leg. 姜勝巧 (S.-Q. Jiang); 1♀ (TARI), 建陽 (Jianyang), 黃坑 ( Huangkeng ), 桂林 (Guiling), 290m, 21.VI.1960 , leg. 姜勝巧 (S.-Q. Jiang); Taiwan. Nantou: 1♀ (TARI), Baibara (= Meiyuan , 眉原), 24.III.1943, leg. A. Aoki ; 1♂ (TARI), Horisha (= Puli , 埔里), 10.V.1913, leg. M. Maki ; 1♂ (TARI), same locality, 10.IV.1919, leg. H. Kawamura (collector was not present on the card) ; 1♂ (TARI), Wanfengtsun (萬豐村), 2.IV.2008, leg. W.-T. Liu ; 1♂ (TARI), same but with “18.IV.2011”; Pingtung : 1♂ (TARI), Shinsuiyei (= Chinshuiying , 浸水營), 17.III.1926, leg. S. Issiki ; 1♀ (TARI), Tahanshan (大漢山), 5.IV.2009, leg. C.-F. Lee ; 2♂, 1♀ (TARI), same but with “26.III.2013”; 12♂, 2♀ (TARI), same but with “18.IV.2018”; 3♂, 1♀ (TARI), same locality, 3.IV.2012, leg. Y.-T. Chung ; 6♂, 2♀ (TARI), same but with “16.IV.2013”; 1♂, 1♀ (TARI), same but with “10.V.2013”; 2♂ (TARI), same but with “28.III.2016”; 2♂ (TARI), same but with “10.IV.2017”; 3♂ (TARI), same but with “17.IV.2017”; 1♂ (TARI), same but with “5.IV.2018”; 2♂ (TARI), same but with “9.IV.2018”; 1♂ (TARI), same but with “23.IV.2018”; 2♂ (TARI), same but with “27.IV.2020”; 1♂ (TARI), same but with “20.III.2021”; 1♂ (TARI), same but with “10.IV.2021”; 2♂ (TARI), same but with “15.IV.2021”; 2♂, 1♀ (TARI), same locality, 29.IV.2014, leg. J.-C. Chen.

Redescription.

Adult Length 5.2-6.3 mm, width 3.8-4.6 mm. Body color (Fig. 2A-C View Figure 2 ) yellowish brown, antennomeres VII-XI black, elytra with eleven black spots: three large spots along suture, anterior spot at basal 1/3, median at apical 1/3, the other at apices; one pair of large spots near base between suture and humeral calli; two pairs of spots at basal 1/3, large spot near lateral margin, small spot between large spot and one on suture; one pair of large spots at apical 1/3 near lateral margins. Antennae (Fig. 3A View Figure 3 ) with antennomere III-V slender, VI slightly swollen, VII-X strongly swollen, XI elongate oval, length ratios of antennomeres I-XI 1.0: 0.5: 0.5: 0.4: 0.3: 0.4: 0.5: 0.5: 0.5: 0.6: 0.9, length to width ratios of antennomeres I-XI 2.1: 1.3: 2.0: 1.7: 1.2: 1.0: 1.1: 1.1: 1.0: 1.0: 1.8. Pronotum 2.4 × wider than long; lateral margins widest at base, convergent and strongly narrowed anteriorly; anterior angles strongly produced; anterior and lateral margins bordered, lateral margins barely visible in dorsal view; trichobothria absent on both anterior and posterior angles; disc covered with sparse, tiny punctures, both sides covered with much larger, denser punctures. Scutellum distinctly wider than long, narrowed posteriorly. Elytra 1.1 × longer than wide; lateral margins slightly wider posteriorly, widest near middle; humeral calli well developed; disc covered with irregular punctures arranged in single rows; interspaces covered with fine, sparse punctures. Hind wing well developed. Aedeagus (Fig. 3B, C View Figure 3 ) with apical process widely rounded in dorsal view, lateral margins moderately narrowed in apical 1/4, with dense setae along lateral margins from near apex to apical 1/3; moderately curved in lateral view; endophallic sclerite extremely elongate, medially wider, basally membranous. Gonocoxae (Fig. 3D View Figure 3 ) slender, but apices wider and angular, disc with dense long setae. Ventrite VIII (Fig. 3E View Figure 3 ) transverse, with several short setae along outer margin. Receptacle of spermatheca (Fig. 3F View Figure 3 ) slightly swollen, not separated from pump; pump short and curved; sclerotized proximal spermathecal duct moderately long.

Diagnosis.

Adults of Gonioctena (Asiphytodecta) subgeminata are easily distinguished from those of other consubgeneric species, G. (A.) tredecimmaculata , by the following combination of the characters: lacking black spots on the pronotum (Fig. 2A View Figure 2 ) (with three black spots on the pronotum in G. (A.) tredecimmaculata (Fig. 2D View Figure 2 )), yellowish brown scutellum (Fig. 2A View Figure 2 ) (black scutellum in G. (A.) tredecimmaculata (Fig. 2D View Figure 2 )), three black spots on suture of elytra, at basal 1/3, median of apical 1/3, and at apices (Fig. 2A View Figure 2 ) (two black spots on suture of elytra, apical 1/3 and near apices in G. (A.) tredecimmaculata (Fig. 2D View Figure 2 )), punctures on elytra arranged into longitudinal striae (Fig. 2A View Figure 2 ) (punctures on elytra entirely confused in G. (A.) tredecimmaculata (Fig. 2D View Figure 2 )), apical process of aedeagus apically wider and apical margin widely rounded (Fig. 3B View Figure 3 ) (apically process of aedeagus apically narrow and apical margin narrowly rounded in G. (A.) tredecimmaculata (Figs 5B View Figure 5 , 6B View Figure 6 ), slender gonocoxae with angular apices (Fig. 3D View Figure 3 ) (wide gonocoxae with irregular apical margin in G. (A.) tredecimmaculata (Figs 5D View Figure 5 , 6D View Figure 6 )), sparse, short setae along outer margins of ventrites VIII (Fig. 3E View Figure 3 ) (dense, short setae along outer margins of ventrite VIII in G. (A.) tredecimmaculata (Figs 5E View Figure 5 , 6E View Figure 6 )), relatively wider spermatheca (Fig. 3F View Figure 3 ) (more slender spermatheca in G. (A.) tredecimmaculata (Figs 5F View Figure 5 , 6F View Figure 6 )).

Host plants.

Fabaceae : Pueraria sp. ( Yang et al. 2015) and Callerya reticulata (Benth.) Schot ( Lee et al. 2016; present study, see below).

Biology.

A large population of Gonioctena (Asiphytodecta) subgeminata was found in Tahanshan (大漢山), where Mr. Yi-Ting Chung (鍾奕霆) collected leaf beetles often. He collected early instar larvae feeding gregariously on young leaves (Fig. 4A-C View Figure 4 ) on 18 March 2022 from Callerya reticulata . In the lab, mature larvae (Fig. 4D View Figure 4 ) burrowed into the soil and built underground chambers for pupation on 22 March. Duration of the pupal stage (Fig. 4E View Figure 4 ) was seven days. Newly emerged adults (Fig. 4F View Figure 4 ) appeared in early April, but females failed to lay eggs. Thus, this species is likely univoltine since adults appear during spring (March to May).

Distribution.

China, Taiwan.