Chauliognathus marginatus

(Fabricius, 1775)

Margined Leatherwing, Margined Soldier Beetle

Chauliognathus marginatus is a ( ) distributed across North and Central America. are and strongly associated with flowers, particularly -blooming . A 2023 study using iNaturalist data demonstrated that this species exhibits statistically significant color preference for white flowers compared to availability, distinguishing it from the closely related Chauliognathus pensylvanicus which prefers flowers. Both and adults are predatory, contributing to of pest .

Chauliognathus marginatus 02 by Kaldari. Used under a CC0 license.

Chauliognathus marginatus 01 by Kaldari. Used under a CC0 license.

Chauliognathus marginatus P1080640a by
xpda. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Chauliognathus marginatus: //kaʊljəɡˈneɪθəs mɑrdʒɪˈneɪtəs//

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

Identification

can be distinguished from Chauliognathus pensylvanicus by association with flowers versus flowers, though this is a probabilistic rather than absolute character. The two overlap broadly in distribution and . Chauliognathus marginatus shows less specialization in flower use than C. pensylvanicus, utilizing a wider variety of families beyond Asteraceae. Definitive identification to species level may require examination of or other subtle morphological characters not visible in field observations.

Images

Appearance

are elongate with soft, flexible () that give the group its 'leatherwings.' Coloration includes dark to black with orange, red, or markings; the specific pattern of marginal markings on the elytra contributes to the name. are 11-segmented, threadlike, and typically held forward of the body. The is wider than the and wider than long. Body length ranges approximately 10–15 mm. are dark gray, velvety, and covered with fine hairs.

Habitat

Found in open including prairies, meadows, and gardens where flowering plants are abundant. are strongly associated with flowers for feeding and mating. occur in soil, leaf litter, and beneath loose bark, where they hunt ground-dwelling .

Distribution

North America and Central America. Records include the United States, Canada (New Brunswick), and Middle countries. Within North America, occurs across a broad range including the Great Plains and other regions with suitable flower resources.

Seasonality

are active in spring and early summer, with peak activity coinciding with bloom periods of preferred flowers. overwinter in soil or protected locations and pupate to emerge as adults the following spring.

Diet

feed on nectar, pollen, and small soft-bodied including and . are predatory on ground-dwelling insects and will ascend plants to hunt in flowers and on foliage.

Host Associations

Asteraceae - flower visitationStrongly preferred ; frequently observed on composite flowers, particularly -blooming

Life Cycle

. laid in soil or litter. develop through multiple , overwinter, and pupate in spring. emerge and are active during daylight hours.

Behavior

activity pattern centered on flower visitation. engage in frequent mating on flowers. When disturbed, adults may withdraw legs and drop to the ground in (). Exhibits statistically significant preference for flowers over expected availability based on local flora.

Ecological Role

contribute to through flower visitation and serve as of soft-bodied pests. are important ground-dwelling predators that help regulate of soil and litter-dwelling . Both function as agents in agricultural and garden settings.

Human Relevance

Considered in gardens and agricultural systems due to on and other pests. Does not damage or structures. Subject of citizen science documentation through platforms like iNaturalist, where it has accumulated over 23,000 observations.

Similar Taxa

Chauliognathus pensylvanicusOverlaps in distribution and ; distinguished by strong preference for flowers versus flowers in C. marginatus, though both use Asteraceae heavily. C. pensylvanicus shows more specialized flower use.
Chauliognathus limbicollisSimilar ; western distribution (Arizona, Colorado, New Mexico, Texas) versus broader North range of C. marginatus.

More Details

Citizen Science Research

A 2023 study in Annals of the Entomological Society of America used over 23,000 iNaturalist observations to demonstrate -specific flower color preferences in C. marginatus, representing the first use of -gathered digital specimens to address species-specific behavioral and ecological questions in .