Brochymena lineata

Ruckes, 1939

rough stink bug

Brochymena lineata is a of rough stink bug in the Pentatomidae, native to North America. Like other members of the Brochymena, it exhibits cryptic coloration that mimics lichen-mottled bark, providing effective camouflage against tree trunks. The species was described by Ruckes in 1939. As with , it is not considered an agricultural or household pest.

Brochymena lineata by (c) Luke Padon, some rights reserved (CC BY), uploaded by Luke Padon. Used under a CC-BY license.

Pronunciation

How to pronounce Brochymena lineata: /brəˈkaɪmɪnə lɪniˈeɪtə/

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Identification

Distinguished from the Brown Marmorated Stink Bug (Halyomorpha halys) by: (1) lacking white bands on the last two segments, and (2) presence of fine teeth along the leading edge of the pronotum. Separation from other Brochymena requires microscopic examination of genitalic structures; field identification to species is generally not possible. The is further distinguished from other native stink bugs by its exceptionally cryptic bark-like appearance and tendency to remain outdoors rather than entering structures.

Images

Habitat

Associated with trees and shrubs where its bark-mimicking camouflage is effective. Overwinters as beneath loose bark or in other sheltered outdoor locations. Does not typically enter human dwellings in large numbers.

Distribution

North America. Specific range within North America not separately documented from ; likely overlaps with broader distribution.

Seasonality

may be observed on warm, sunny winter days when they emerge from hibernation sites. Active primarily in spring and fall around periods of dormancy. One per year in temperate climates.

Life Cycle

laid in small clusters on twigs of trees. Nymphs progress through four instars before reaching adulthood. Development from egg to is prolonged, resulting in a single annually in temperate regions. Overwinters in the adult stage.

Behavior

fly well and may alight on contrasting surfaces such as fences or sidewalks, making them more detectable than when resting on bark. Aggregates with conspecifics under loose bark for winter dormancy. Survives freezing temperatures; individuals have been observed to recover after extended freezing.

Ecological Role

Suspected to feed on plant sap of trees and shrubs. May occasionally be predatory or scavenging on other insects, as reported for the . Serves as prey for sand wasps (Bicyrtes quadrifasciata), birds, and fence lizards. Parasitized by tachinid flies (Trichopoda spp.) and including platygastrid (Trissolcus brochymenae, Telenomus sp.) and the eupelmid wasp Anastatus reduvii.

Human Relevance

Not a pest . Does not invade homes in large unlike the Brown Marmorated Stink Bug. No economic impact on agriculture or forestry documented. Occasionally encountered by entomologists and naturalists due to its effective camouflage.

Similar Taxa

Brochymena affinisSimilar bark-mimicking appearance; -level identification requires microscopic examination
Brochymena quadripustulataOverlapping range and nearly identical cryptic ; distinguished by subtle structural differences visible only under magnification
Halyomorpha halys (Brown Marmorated Stink Bug) frequently confused with Brochymena; distinguished by banded , smooth pronotal margin, and tendency to aggregate in large numbers on buildings

More Details

Taxonomic note

identification within Brochymena is challenging and generally requires examination of dead specimens under a microscope. Brochymena lineata was described by Ruckes in 1939, but field records often report the without species-level determination.

Cold tolerance

Members of this demonstrate remarkable cold hardiness. Anecdotal reports indicate can survive extended freezing and resume activity upon thawing.