Cassida flaveola

Thunberg, 1794

pale tortoise beetle

Cassida flaveola, known as the pale tortoise beetle, is a brownish leaf beetle in the Chrysomelidae. It was historically considered an introduced Palearctic in North America, but recent evidence indicates it is at least in part native with a Holarctic distribution. The species has been newly recorded in Nova Scotia and Prince Edward Island in the Maritime Provinces of Canada.

Cassida flaveola by (c) Barry Walter, some rights reserved (CC BY), uploaded by Barry Walter. Used under a CC-BY license.

Cassida flaveola by (c) Maria, some rights reserved (CC BY), uploaded by Maria. Used under a CC-BY license.

Pronunciation

How to pronounce Cassida flaveola: //ˈkas.si.da flaˈve.o.la//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other Cassida by its brownish coloration and the specific plant associations with Caryophyllaceae species. Similar to other tortoise beetles in general body form but differs in coloration and host plant specificity. The species name 'flaveola' (meaning somewhat yellow) may relate to subtle coloration differences from darker .

Images

Habitat

Associated with vegetation on upper strandlines or sandy/chalky soils; found in coastal and areas supporting its Caryophyllaceae plants.

Distribution

extending east to the Russian Far East; North America with Holarctic distribution (at least in part native); newly recorded in Nova Scotia and Prince Edward Island in the Maritime Provinces of Canada.

Diet

Specialized herbivore feeding on Caryophyllaceae .

Host Associations

Cerastium vulgatum - plantCaryophyllaceae
Honckenya peploides - plantCaryophyllaceae
Malachium aquaticum - plantCaryophyllaceae
Spergula arvensis - plantCaryophyllaceae
Spergula nemorum - plantCaryophyllaceae
Stellaria graminea - plantCaryophyllaceae
Stellaria media - plantCaryophyllaceae

Behavior

and larvae feed on leaves of plants. Larvae likely construct fecal shields for defense, as is characteristic of the Cassidinae, though this has not been explicitly documented for this .

Ecological Role

Herbivore specializing on Caryophyllaceae; contributes to potential of its plants. May serve as prey for and .

Human Relevance

Subject of taxonomic and zoogeographic interest due to questions about its native versus introduced status in North America. Has potential as a biocontrol agent for weedy Caryophyllaceae .

Similar Taxa

Cassida rubiginosaSimilar tortoise beetle but differs in coloration (more reddish in C. rubiginosa) and plant associations (C. rubiginosa specializes on thistles, Asteraceae)
Other Cassida speciesShare general tortoise beetle body form but differ in coloration, plant specificity, and geographic distribution

Misconceptions

Previously considered an introduced Palearctic in North America, but recent evidence indicates C. flaveola is at least in part a native species with a Holarctic distribution. Early records and origins in the Maritime Provinces remain subject to investigation regarding possible human-mediated introduction.

More Details

Taxonomic and Zoogeographic Status

The native versus introduced status of C. flaveola in North America has been debated. A 2008 study in Zootaxa concluded that recent evidence indicates it is at least in part a native with a Holarctic distribution, rather than solely a human-introduced Palearctic species.

Research Needs

Questions remain regarding the presence and origins of C. flaveola in the Maritime Provinces, including whether it may have been introduced via human agency in some areas while being native in others.