Nephaspis

Casey, 1899

minute lady beetles

Species Guides

1

Nephaspis is a of minute lady beetles in the Coccinellidae. within this genus are specialized of whiteflies, particularly Bemisia argentifolii, and have been extensively studied as agents. The genus was established by Casey in 1899. Many species formerly placed in Nephaspis have been reclassified to Clitostethus. The best-studied species, N. oculatus, exhibits a Type II to prey and completes development from to in approximately 24 days at 26°C.

Pronunciation

How to pronounce Nephaspis: /nɛˈfæspɪs/

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Identification

Nephaspis are minute coccinellids, typically smaller than common lady beetles. Distinguished from other Coccinellidae by their small size and specialized association with whitefly prey. Separation from Clitostethus requires examination of taxonomic characters; historically, many Nephaspis species were transferred to Clitostethus.

Habitat

Associated with plants infested by whiteflies, particularly agricultural crops. Laboratory studies have used hibiscus, collard, cotton, cucumber, cantaloupe, and broccoli as plants. Natural data are limited; observations are primarily from agricultural and managed systems.

Diet

Specialized of whiteflies, particularly Bemisia argentifolii (silverleaf whitefly). Prey includes whitefly and nymphs. Laboratory studies indicate consume 20-30 whitefly eggs or nymphs daily; larvae consume 300-400 eggs during development.

Host Associations

Life Cycle

For N. oculatus at 26°C: stage 4.5 days, larval stage 12.6 days, pupal stage 7.4 days; total egg-to- development 24.5 days. survival 75.3%. Adult longevity averages 61.3 days for females and 56.2 days for males. Females lay eggs singly on leaves, stems, and leaf petioles; preoviposition period 6.6 days; lifetime approximately 104 eggs per female at 1.7 eggs per day.

Behavior

Exhibits Type II : rate increases with prey then plateaus. Fourth instar larvae are most effective , followed by third, second, and first instars. Larvae exhibit when prey is scarce. show strong plant preference for oviposition and foraging: preferred collard over tomato, soybean, eggplant, and sweet potato, with no deposited on soybean or tomato.

Ecological Role

of whitefly pests in agricultural . agent for Bemisia argentifolii, a significant pest of food and fiber crops.

Human Relevance

Studied and utilized as a agent for silverleaf whitefly in agricultural systems. Laboratory rearing protocols established for mass production.

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