Aphelinoidea

Girault, 1911

Aphelinoidea is a of minute in the Trichogrammatidae, described by A.A. Girault in 1911. are of leafhoppers (Hemiptera: Cicadellidae), with several species of economic importance as agents. The genus has an almost distribution. Notable include the beet leafhopper (Circulifer tenellus), a of beet curly top virus affecting crops such as tomatoes, sugar beets, and peppers. Two species, A. anatolica and A. turanica, were introduced from Iran into California for biological control and became established. The genus reproduces by , where unmated females produce only male offspring.

Pronunciation

How to pronounce Aphelinoidea: /ˌæfɪlɪˈnɔɪdiə/

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Identification

Aphelinoidea can be identified by short wing venation and the presence of numerous discal setae on the wings. The funicle is absent, and the long clava consists of 2 or 3 segments. Molecular and morphological studies have revealed cryptic diversity; in California and other arid western states previously identified as A. plutella were found to represent at least two distinct new species, A. zarehi and A. roja. sequence analysis and cross-mating tests have confirmed species boundaries within the .

Habitat

Associated with supporting leafhopper , including agricultural fields and natural vegetation. In California, occur in areas where the beet leafhopper is present. One species, A. sariq, was reared from laid inside galls on camelthorn (Alhagi maurorum) in Uzbekistan.

Distribution

Almost . Documented from North America (California, Arizona, Alberta, Alabama), Central and South America (Bolivia, Argentina), the Palaearctic region (Uzbekistan, Iran, Turkmenistan), and other regions. Introduced established in California from Iranian origin.

Host Associations

Life Cycle

reproduce by : females are and produce female offspring only after mating, while unmated females produce only male offspring. Developmental times have been documented for introduced species. Both sexes of A. sariq emerged from of Scenergates viridis; additional females were found dead inside galls.

Behavior

targeting leafhopper eggs laid in plant tissue. Some associated with galls formed by their . Cross-mating tests between species have failed to show interbreeding, indicating reproductive isolation.

Ecological Role

of leafhoppers, functioning as a agent. Several are of interest for management of agricultural pests, particularly leafhoppers that plant . The introduced species A. anatolica and A. turanica in California help suppress of the beet leafhopper, reducing transmission of beet curly top virus to crops.

Human Relevance

Used in programs. Two (A. anatolica and A. turanica) were intentionally introduced from Iran into California against the beet leafhopper and became established. species were previously misidentified, complicating earlier assessments. Molecular and morphological tools now enable accurate species identification for targeted biocontrol applications.

Similar Taxa

  • TrichogrammaBoth are Trichogrammatidae , but Aphelinoidea lacks the funicle and has a long 2-3 segmented clava, whereas Trichogramma has different antennal structure and wing venation patterns
  • ParacentrobiaBoth are Trichogrammatidae of leafhoppers; Paracentrobia have different wing venation and antennal segmentation patterns requiring microscopic examination for separation
  • UfensAnother trichogrammatid of leafhoppers; distinguished by wing venation details and antennal structure

Misconceptions

Earlier studies misidentified Aphelinoidea in California and arid western states as A. plutella; subsequent research showed these represented at least two distinct new (A. zarehi and A. roja), with no evidence that A. plutella actually occurs in the western United States.

More Details

Taxonomic history

The was described by Girault in 1911. A revision of Holarctic was published by Trjapitzin in 1995. Subsequent morphological and molecular studies have described additional species and corrected misidentifications. The genus is considered large and diverse, with over 40 described species.

Molecular diagnostics

sequence analysis has been instrumental in resolving boundaries, particularly for distinguishing cryptic species within the . COI and ITS2 markers have been used to differentiate species and confirm reproductive isolation.

Conservation status

Not evaluated. The is widespread and some are abundant in agricultural systems where their leafhopper occur.

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