Stiretrus

Laporte, 1833

anchor stink bugs

Stiretrus is a of in the Asopinae, . occur in the Americas, with records from North America (USA, Canada) and South America (Brazil, Suriname). The genus includes at least eight described species, with S. anchorago (anchor ) being among the better known. Members are of other , with documented specialization on cassidine () in some species. Some species exhibit striking color and possible with their .

Stiretrus anchorago by (c) Healthy Yards, some rights reserved (CC BY), uploaded by Healthy Yards. Used under a CC-BY license.

Stiretrus anchorago by (c) skitterbug, some rights reserved (CC BY), uploaded by skitterbug. Used under a CC-BY license.

Pronunciation

How to pronounce Stiretrus: /ˈstaɪ.rɛ.trʊs/

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Identification

Asopinae placement distinguishes Stiretrus from ; however, -level identification within the genus requires examination of specific morphological characters not detailed in available sources. of S. decemguttatus show up to 17 color pattern variations based on three basic marking sets, which may complicate visual identification.

Images

Habitat

Vacant lots and vegetation in urban and semi-urban areas; specifically recorded from areas with Ipomoea asarifolia (Convolvulaceae) on Marajó Island, Brazil. Activity appears concentrated during rainy season in tropical regions.

Distribution

Americas: USA (including Vermont), Canada, Brazil (Pará State—Marajó Island, Maranhão State—São Luis Island), and Suriname.

Seasonality

In tropical regions (Brazil), and observed mainly during rainy season; temperate (S. fimbriatus) overwinter as adults.

Diet

Predatory; documented includes cassidine (: Cassidinae), specifically late- of Botanochara sedecimpustulata and Zatrephina lineata. Attacks all developmental stages of prey (, larvae, , ), with preference for late-instar larvae. No laboratory preference shown between cassidine when both offered.

Host Associations

Botanochara sedecimpustulata - Cassidine , late- preferred
Zatrephina lineata - Cassidine , late- preferred
Ipomoea asarifolia - associated vegetation of ; site of -prey interactions
Sida sp. - siteDry calyxes used for clutch deposition and
Cylindromyia fumipennis - of S. fimbriatus

Life Cycle

, five nymphal , . S. decemguttatus: egg incubation 6 days; stage ~16 days; adult stage ~22 days; total ~44 days. S. fimbriatus: egg development ~9.5 days; nymphal instars average 5.1, 4.3, 4.1, 4.3, and 8.2 days respectively. Nymphal instars separable by width or pronotal width with no overlap.

Behavior

clutches in dry calyxes of Sida sp. for . Attacks all but preferentially targets late- . Exhibits color : S. decemguttatus display up to 17 color patterns from three basic marking sets; show three color patterns independent of adult patterns. Possible with associated with Ipomoea asarifolia.

Ecological Role

of cassidine ; potentially plays fundamental role in coexistence patterns of . increase follows seasonal abundance of prey . May contribute to of cassidine beetle populations.

Human Relevance

Potential agent for cassidine (), which include some agricultural pests. No direct economic importance documented.

Similar Taxa

PodisusAlso in :Asopinae; both are with similar biology and nymphal development patterns. S. fimbriatus and P. placidus have been studied together, sharing similar nymphal duration and .
PerillusAnother Asopinae with predatory habits; some show similar color patterns and on , potentially causing confusion in field identification.

More Details

Color polymorphism and mimicry

S. decemguttatus exhibits extensive color with up to 17 color patterns. Some patterns resemble cassidine (Botanochara, Zatrephina) that feed on Ipomoea asarifolia, suggesting possible participation in a mimetic ring. This polymorphism may complicate field identification and could represent an anti- or hunting strategy.

Population dynamics

time (T) of 12.65 days and intrinsic growth rate (r) of 0.25 reported for S. decemguttatus under laboratory conditions. increase in the field follows seasonal increase in larval abundance.