Euthyrhynchus

Dallas, 1851

Florida predatory stink bug

Species Guides

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Euthyrhynchus is a of predatory stink bugs in the Pentatomidae, Asopinae. The sole , E. floridanus (Florida ), is native to the southeastern United States and has expanded its range northward in recent decades, now regularly occurring as far north as the Mid-Atlantic and New England. This shield bug is considered beneficial in agricultural and garden settings due to its on pest insects.

Euthyrhynchus floridanus by (c) Serenella Linares, some rights reserved (CC BY), uploaded by Serenella Linares. Used under a CC-BY license.Euthyrhynchus floridanus by (c) gr0mmy, some rights reserved (CC BY), uploaded by gr0mmy. Used under a CC-BY license.Euthyrhynchus floridanus 3 by Brennan Peabody. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Euthyrhynchus: /juːˈθɪrɪŋkəs/

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Distribution

Native to tropical and semi-tropical regions from Peru to the southeastern United States. Historical range limited to the hottest parts of the southeastern U.S., but has expanded northward to Maryland, Virginia, New Hampshire, and the Dakotas in response to warming climates.

Seasonality

Active during warmer months; and nymphs observed throughout summer and autumn in expanded northern range. capability in milder winters allows earlier spring activity.

Diet

. Prey includes caterpillars, larvae, other stink bugs, and various soft-bodied insects. Documented prey: greater wax moth larvae (Galleria mellonella), Mexican bean beetle (Epilachna varivestis), tobacco budworm larvae (Heliothis virescens), black cutworm larvae (Agrotis ipsilon), beetles, planthoppers, weevils, long-tailed skipper larvae (Urbanus proteus), and southern green stink bug (Nezara viridula). Also preys on brown marmorated stink bugs and kudzu bugs.

Life Cycle

Females lay batches of 20–90 barrel-shaped with small projections at the edge of the . Nymphs pass through five instars. First instars remain near egg mass; later instars aggregate and sometimes feed on common prey items. At 24°C, eggs hatch in 35 days and nymphal development takes 65 days; at 27°C, these shorten to 20 and 40 days respectively. females require approximately two weeks to mature and lay about 140 eggs total. Developmental period is longer than close relatives in Asopinae.

Behavior

Predatory feeding using beak-like mouthparts to impale and immobilize prey, then suck body fluids. Nymphs exhibit gregarious , particularly early instars remaining near mass and later instars grouping together. and nymphs observed resting on tree bark and man-made structures including utility meters.

Ecological Role

of soft-bodied insects in terrestrial . Contributes to of agricultural and garden pests.

Human Relevance

Considered beneficial for biological pest control in gardens and agriculture. Range expansion into northern regions linked to climate change and reduced winter mortality.

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