Thyanta

Stål, 1860

redshouldered stink bugs, red-shouldered stink bugs

Species Guides

7

Thyanta is a of stink bugs in the Pentatomidae containing approximately 19 described . Species in this genus are recognized by a distinctive reddish band across the pronotum (the 'shoulder' region behind the ), giving them the 'redshouldered stink bugs.' Several Thyanta species are significant agricultural pests, particularly of soybean, corn, and various legume crops. The genus is native to the Americas, with species distributed from North America through South America.

Thyanta perditor by (c) Richard Stovall, some rights reserved (CC BY), uploaded by Richard Stovall. Used under a CC-BY license.Thyanta calceata by (c) Andrew Meeds, some rights reserved (CC BY), uploaded by Andrew Meeds. Used under a CC-BY license.Thyanta maculata by (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick. Used under a CC-BY license.

Pronunciation

How to pronounce Thyanta: /ˈθaɪ.əntə/

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

Identification

Thyanta are distinguished from other by the presence of a reddish band across the surface of the pronotum (the 'shoulder' region). This contrasts with the redbanded stink bug (Piezodorus guildinii), which has a similar band but possesses a long spine projecting between the hind legs—a structure absent in Thyanta. Thyanta species lack the long, pointed spine characteristic of Chinavia (green stink bugs) and differ in coloration from brown stink bugs (Euschistus spp.). Some Thyanta species exhibit color ; for example, Thyanta custator accerra occurs in both green and brown forms.

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Habitat

Agricultural fields, particularly soybean and corn; also found in areas with wild plants including legume weeds. have been documented on cultivated crops and wild plants such as Bidens pilosa.

Distribution

Americas; documented in North America (including the Midwestern United States, Texas, Florida, and Vermont) and South America (Neotropical region). Specific distribution varies by species.

Life Cycle

with , nymph, and stages. Females lay barrel-shaped eggs in masses on plants. Nymphs pass through five instars before becoming adults, with development occurring on host plants. Adults of some exhibit seasonal dimorphism.

Behavior

Aggregating on plants has been observed. Seasonal movement between wild host plants and cultivated crops occurs. When disturbed or crushed, release defensive compounds producing an unpleasant odor.

Ecological Role

Agricultural pest; feeding damage reduces crop yield and quality. Multiple Thyanta are documented pests of soybean, causing damage to developing flowers, pods, and seeds. Damage include flat pod, delayed crop maturity, and reduced germination rates in seed production.

Human Relevance

Economic pest of soybean, corn, wheat, barley, oats, rye, sorghum, rice, peanut, common bean, lima bean, cowpea, alfalfa, clover, cotton, and tobacco. Management involves scouting with sweep nets or ground cloths and applying when exceed . approaches are recommended due to the extended vulnerability period of crops and potential for reinfestation by flying .

Similar Taxa

  • Piezodorus guildiniiBoth have a reddish band across the pronotum, but P. guildinii possesses a long spine projecting between the hind legs that is absent in Thyanta.
  • Chinavia hilarisSimilar shield-shaped body, but Chinavia lacks the reddish shoulder band and has a longer, pointed spine.
  • Euschistus spp.Brown stink bugs differ in coloration (predominantly brown) and lack the distinctive reddish pronotal band.

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