Amynothrips andersoni

O'Neill, 1968

Alligatorweed Thrips, Alligator Weed Thrips

Amynothrips andersoni is a of in the Phlaeothripidae, native to South America and introduced to the United States as a agent against the aquatic weed alligator weed (Alternanthera philoxeroides). are small, shiny black insects approximately 2 mm in length. The species exhibits wing dimorphism, with both short-winged and long-winged flying forms present, though the latter is rare. Both larval and adult stages feed on alligator weed, causing leaf curling and plant stunting.

Pronunciation

How to pronounce Amynothrips andersoni: //ˈæmɪnoʊˌθrɪps ˌændərˈsoʊnaɪ//

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Identification

can be recognized by their small size (2 mm), shiny black coloration, and association with alligator weed. The presence of both short-winged and long-winged forms is notable, with the long-winged form being rare. Distinguished from other by its specific association with Alternanthera philoxeroides and its use as a agent.

Habitat

Aquatic and semi-aquatic environments associated with alligator weed (Alternanthera philoxeroides), including wetlands, waterways, and flood-prone areas where the plant grows.

Distribution

Native to South America (Argentina, Brazil). Introduced and established in the southeastern United States, particularly Florida, for purposes.

Diet

Feeds exclusively on alligator weed (Alternanthera philoxeroides). Both larvae and feed on leaf buds and along leaf edges.

Host Associations

  • Alternanthera philoxeroides - obligate Alligator weed; sole known plant

Life Cycle

are tan ovoids approximately 0.5 mm long. Larva has two instars: first instar tan, second instar bright scarlet red. lifespan approximately 90 days. Female lays approximately 200 eggs during her adult lifespan.

Behavior

Arrhenotokous : females produce male and female offspring if mated; unmated females produce only male offspring. Feeding occurs on leaf buds and leaf edges, causing characteristic curling of leaves and stunting of plant.

Ecological Role

Specialized herbivore and agent. Acts as a natural enemy of alligator weed, contributing to suppression of this noxious aquatic plant in introduced ranges.

Human Relevance

Used as a agent for management of alligator weed (Alternanthera philoxeroides) in the United States. Introduced and released intentionally for pest management purposes; now established in much of the southeastern United States.

Similar Taxa

  • Other Amynothrips speciesSame ; distinguished by specificity and geographic distribution
  • Generalist thrips speciesAmynothrips andersoni is distinguished by its obligate association with alligator weed and shiny black coloration

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Sources and further reading