Neochlamisus gibbosus

(Fabricius, 1777)

warty leaf beetle

Neochlamisus gibbosus is a of warty leaf beetle in the Chrysomelidae, found in Central and North America. The species exhibits remarkable -mimicry as , with a compact, humped body that closely resembles caterpillar excrement. Females lay single covered in frass, forming bell-shaped protective coverings. Larvae are case-bearing, constructing portable cases from their own and attaching them to plants during molting. When threatened, both adults and larvae release a yellow defensive liquid. The species has been studied in detail from on Rubus laudatus in Kansas.

Pronunciation

How to pronounce Neochlamisus gibbosus: /niːoʊkləˈmaɪsəs dʒɪˈboʊsəs/

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

Identification

are small (approximately 3-4 mm), with a distinctly humped, compact body shape and rough, warty texture that mimics caterpillar . When disturbed, the retracts its and folds legs and into precisely matched grooves, eliminating visible appendages and enhancing the fecal resemblance. Some individuals show variable coloration with an almost metallic sheen matching certain caterpillar frass types. Larvae are case-bearing, housed in fecal cases that they attach to plants during molting.

Habitat

Associated with plants in the Rosaceae, specifically documented from Rubus laudatus (dewberry) in Kansas. Likely occurs in open woodland edges and disturbed areas where host plants grow.

Distribution

Central America and North America. Documented from Kansas in the United States; broader distribution across both regions based on GBIF records.

Diet

Herbivorous; feeds on Rubus laudatus (Rosaceae). plant specificity requires further documentation.

Host Associations

Rubus laudatus - primary plantDocumented from field studies in Kansas; beetles feed on foliage and reproduce on this .

Life Cycle

Complete . Females lay one at a time, covering each egg with to create a bell-shaped protective covering. Larvae construct portable cases from fecal material (case-bearing habit typical of Cryptocephalinae). Larvae attach their cases to plants when molting. likely occurs within the larval case or in soil, though specific details for this require confirmation.

Behavior

exhibit remarkable -mimicry: when threatened, they retract and appendages into body grooves, closely resembling caterpillar excrement. When disturbed sufficiently, they may roll off leaves to escape. Both adults and larvae release a yellow defensive liquid when threatened. Larvae actively attach their fecal cases to plant substrate during molting.

Ecological Role

Herbivore on Rosaceae; serves as occasional prey for including Cerceris fumipennis (though primarily a buprestid , this wasp has been recorded taking Neochlamisus ).

Similar Taxa

Exema spp.Both are warty leaf beetles (Chlamisini) with -mimicry and case-bearing larvae; Exema is smaller (2-3 mm vs. 3-4 mm) and associated with Asteraceae rather than Rosaceae.
Other Neochlamisus speciesSeveral exist in North America; N. platani (on sycamore) has bright coppery coloration and may be confused, but plant association helps distinguish species.