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P1080933 Cassida nebulosa.jpg
C. nebulosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Chrysomelidae
Subfamily: Cassidinae
Tribe: Cassidini
Genus: Cassida
Linnaeus, 1758
Type species
Cassida nebulosa
Linnaeus, 1758

Cassida is a large Old World genus of tortoise beetles in the subfamily Cassidinae. Several species of Cassida are important agricultural pests, in particular C. vittata and C. nebulosa on sugar beet and spinach. The thistle tortoise beetle (Cassida rubiginosa) has been used as a biological control agent against Canada thistle.