Frass-mimicry
Guides
Exema
warty leaf beetles
Exema is a genus of warty leaf beetles in the tribe Fulcidacini, subfamily Cryptocephalinae. These small beetles (2–3 mm) are renowned for their remarkable fecal mimicry—when disturbed, they retract their head, legs, and antennae into grooves, resembling caterpillar frass. The genus occurs worldwide with at least 9 species in North America. Exema species have been documented on Asteraceae hosts including gray-headed coneflower (Ratibida pinnata) and sweet coneflower (Rudbeckia subtomentosa). Larvae are case-bearing, constructing protective cases from their own feces.
Exema deserti
Exema deserti is a species of warty leaf beetle in the family Chrysomelidae, described by Pierce in 1940. It belongs to the tribe Chlamisini, commonly known as warty leaf beetles, which are characterized by their remarkable mimicry of caterpillar frass. The species is found in Central America and North America.
Exema dispar
warty leaf beetle
Exema dispar is a species of warty leaf beetle in the tribe Chlamisini, known for remarkable mimicry of caterpillar frass. Adults are small (2–3 mm), compact beetles with a rough, warty exoskeleton that closely resembles the size, shape, texture, and coloration of lepidopteran larval droppings. When disturbed, the beetle retracts its head and folds legs and antennae into precisely matched grooves, eliminating any visible beetle-like features. This species has been observed on Asteraceae plants including gray-headed coneflower (Ratibida pinnata) and sweet coneflower (Rudbeckia subtomentosa).
Exema gibber
warty leaf beetle
Exema gibber is a species of warty leaf beetle in the family Chrysomelidae, native to North America. As a member of the tribe Chlamisini, it exhibits remarkable frass-mimicry camouflage, retracting its head, legs, and antennae into body grooves when disturbed to resemble caterpillar droppings. The species measures approximately 2–3 mm in length and has been observed feeding on Asteraceae plants, including gray-headed coneflower (Ratibida pinnata) and sweet coneflower (Rudbeckia subtomentosa).
Exema mormona
warty leaf beetle
Exema mormona is a species of warty leaf beetle in the family Chrysomelidae, described by Karren in 1966. It belongs to the tribe Chlamisini, whose members are known for their remarkable mimicry of caterpillar frass. The species occurs in North America, though specific details about its biology and ecology remain poorly documented in published literature.
Exema neglecta
warty leaf beetle
Exema neglecta is a species of warty leaf beetle in the tribe Chlamisini, subfamily Cryptocephalinae. Adults are small, measuring approximately 2–3 mm in length. The species exhibits remarkable frass-mimicry, resembling caterpillar droppings in size, shape, texture, and coloration. When disturbed, the beetle retracts its head, legs, and antennae into precisely matched grooves, completing the illusion of inanimate debris. This species is found in North America.
Fulcidacini
Warty Leaf Beetles
Fulcidacini is a tribe of leaf beetles (Chrysomelidae) within the subfamily Cryptocephalinae, historically treated as the distinct subfamily Chlamisinae. The tribe comprises 11 genera and approximately 400 species, with roughly 80% of species occurring in the Neotropics. Members are commonly known as warty leaf beetles due to their distinctive appearance and are characterized by case-bearing larvae that construct protective cases from fecal material.
Neochlamisus
warty leaf beetles
Neochlamisus is a genus of case-bearing leaf beetles in the tribe Fulcidacini, commonly known as warty leaf beetles. Adults measure 3–4 mm and exhibit cryptic coloration resembling caterpillar frass. The genus comprises 17–18 species restricted to North America, including Mexico. These beetles are notable for their elaborate fecal case construction by larvae and have become important model organisms for studying host-associated speciation, particularly in N. bebbianae, which exhibits distinct host forms on different tree species.
Neochlamisus bimaculatus
warty leaf beetle
Neochlamisus bimaculatus is a small case-bearing leaf beetle in the tribe Chlamisini, commonly known as warty leaf beetles. The species is associated with Rubus spp., including blackberry, on which it mates, feeds, and oviposits. Like other members of the Camptosomata, it exhibits remarkable mimicry of caterpillar frass for protection against predators.
Neochlamisus chamaedaphnes
Neochlamisus chamaedaphnes is a case-bearing leaf beetle in the tribe Chlamisini, commonly known as warty leaf beetles. Members of this genus are renowned for their remarkable frass-mimicry crypsis—when disturbed, they retract their head, legs, and antennae into precisely matched grooves, becoming nearly indistinguishable from caterpillar droppings. The species epithet references its association with leatherleaf (Chamaedaphne calyculata), a bog plant in the Ericaceae family. This species occurs in eastern Canada and presumably adjacent northeastern United States.
Neochlamisus eubati
Blackberry Case-bearing Leaf Beetle, warty leaf beetle
Neochlamisus eubati is a species of case-bearing leaf beetle in the tribe Chlamisini, commonly known as warty leaf beetles. Adults are small beetles, typically 3–4 mm in length, with a compact body form adapted for crypsis. The species is known from Central America and North America, with records extending into Alberta, Canada. Like other members of the genus, larvae construct protective cases from fecal material and exuviae.
Neochlamisus gibbosus
warty leaf beetle
Neochlamisus gibbosus is a species of warty leaf beetle in the family Chrysomelidae, found in Central and North America. The species exhibits remarkable frass-mimicry as adults, with a compact, humped body that closely resembles caterpillar excrement. Females lay single eggs covered in frass, forming bell-shaped protective coverings. Larvae are case-bearing, constructing portable cases from their own feces and attaching them to host plants during molting. When threatened, both adults and larvae release a yellow defensive liquid. The species has been studied in detail from populations on Rubus laudatus in Kansas.
Neochlamisus platani
sycamore leaf beetle
Neochlamisus platani, commonly known as the sycamore leaf beetle, is a small leaf beetle in the family Chrysomelidae. Adults are bronze to brown in color with a rough, bumpy exoskeleton that provides camouflage against bark and debris. The species is tightly associated with its host plant, the American sycamore (Platanus occidentalis), where it feeds, mates, and oviposits. Both adults and larvae consume sycamore foliage, and heavy infestations can reduce foliage mass and damage ornamental value.
Neochlamisus scabripennis
warty leaf beetle
Neochlamisus scabripennis is a species of warty leaf beetle in the family Chrysomelidae. It belongs to the tribe Chlamisini, commonly known as warty leaf beetles due to their distinctive irregular, tuberculate body surface. The species is distributed across Central America and North America. Like other members of the genus, it exhibits remarkable mimicry of caterpillar frass (feces) as a defensive adaptation.
Neochlamisus velutinus
warty leaf beetle
Neochlamisus velutinus is a species of warty leaf beetle in the family Chrysomelidae. It is found in Central America and North America. Like other members of the tribe Chlamisini, it exhibits remarkable frass-mimicry, resembling caterpillar excrement when disturbed.