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Redescription of Gastrophysa atrocyanea (Motschulsky) and G. polygoni (Linnaeus) (Insecta: Coleoptera: Chrysomelidae: Chrysomelinae), with Notes on Their Biology
Habitus of adult Gastrophysa species. 1. <i>G. atrocyanea</i>, dorsal view, 2. Ditto, ventral view, 3. Ditto, lateral view, 4. <i>G. polygoni</i>, female, dorsal, 5. Ditto, ventral view, 6. Ditto, lateral view.
Habitus of adult Gastrophysa species. 1. G. atrocyanea, dorsal view, 2. Ditto, ventral view, 3. Ditto, lateral view, 4. G. polygoni, female, dorsal, 5. Ditto, ventral view, 6. Ditto, lateral view.

Author:Chi-Feng Lee*

Abstract:

     Gastrophysa atrocyanea (Motschulsky, 1860) is a Chrysomelinae species that appears only during spring, with only one record reported from Taiwan. More specimens were collected from Kinmen islands. This species was redescribed, based on morphological characteristics, including the penis, gonocoxae, spermatheca, and abdominal ventrite VIII in females. Another widespread species, G. polygoni (Linnaeus), was compared to test the diagnostic value of these characters. Detailed biological information is provided for G. atrocyanea, including larval and adult feeding behaviors, host plants, and life cycle. G. polygoni elongata Jolivet 1951 is proposed as a junior synonym of the nominate subspecies.

Key words:Leaf beetles, Taxonomy, Polygonaceae, Rumex nipponicus, Rumex crispus

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Journal of
Taiwan Agricultural Research
Vol. 74, No.1 (2025) ISSN: 2790-086X Vol. 74, No.1 (2025)
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