Pseudogonatopus

Perkins, 1905

Pseudogonatopus is a of established by Perkins in 1905. in this genus are of (: ), particularly Nilaparvata lugens (), a major rice pest in Asia. The genus exhibits : females are wingless with -like , while males are winged. Members possess strong used for . The genus has been studied extensively for its role in of rice planthoppers and for assessing non-target effects of transgenic Bt rice.

Pronunciation

How to pronounce Pseudogonatopus: //sjuːdoʊˌɡoʊnəˈtoʊpəs//

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Identification

Wingless females distinguished from by features including constricted waist and structure. Within , separation from related requires examination of in males and detailed morphological characters. Ant-like female is distinctive but can cause misidentification as by non-.

Appearance

pronounced: females wingless with -like body form; males winged. Strong present, capable of biting . General with forelegs typical of .

Habitat

Rice agroecosystems (Oryza sativa fields); tropical and subtropical wetlands where occur.

Distribution

Asia, including China (documented in Zhejiang Province field studies) and south Asian rice-growing regions where Nilaparvata lugens occurs.

Host Associations

Nilaparvata lugens - , primary ; deposited on and

Life Cycle

deposited on and of Nilaparvata lugens; form 8-11 days after ; adults emerge 10.5-14 days later; development from eggs to cocoons approximately 9.4-9.8 days; male eggs to adults approximately 22.0-22.5 days; female eggs to adults approximately 22.7-23.4 days; cocoon to adult survival approximately 76-85%. Sex ratio approximately 30-33% male.

Behavior

on after biting with strong . Exhibits described by Holling's III when attacking hosts. observed in laboratory conditions but rare in nature. Direct feeding on rice material documented as exposure to plant compounds.

Ecological Role

agent of Nilaparvata lugens, providing natural pest suppression in rice agroecosystems. Serves as for biosafety assessment of transgenic due to its role as a non-target .

Human Relevance

Important in of rice; studied extensively for non-target risk assessment of Bt rice . Laboratory and field studies indicate Cry1C and Cry2A rice do not significantly affect development, survival, longevity, , or .

Similar Taxa

GonatopusRelated with similar -like wingless females; distinguished by morphological details of male and
Ants (Formicidae)Wingless females superficially resemble due to convergent ; distinguished by base scars in females, structure, and absence of metapleural glands

More Details

Bt rice biosafety

Pseudogonatopus flavifemur has been extensively studied as a non-target organism for transgenic rice safety assessment. Direct feeding on rice plants is the main exposure to Cry1C and Cry2A , not -mediated exposure. No Bt protein detected in , , or newly emerged ; detected only in exposed females via direct feeding.

Functional response characteristics

Exhibits III () to , indicating low attack rates at low host densities with accelerating as host density increases. Searching efficiency decreases with increasing density following the relationship: log a = −1.0099 − 0.3638 log P.