Semidalis
Enderlein, 1905
dusty-wing
Semidalis is a of dusty-wing lacewings ( Coniopterygidae) comprising small predatory insects with bodies covered in white wax. and larvae are active of tiny arthropods including spider mites, scale insects, and whiteflies. The genus has an almost distribution, with records from Europe, China, Africa, and North America. Some remain active during winter months in temperate regions.
Pronunciation
How to pronounce Semidalis: /ˌsɛ.mɪˈda.lɪs/
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Identification
distinguished from other by the dense white waxy coating covering the body and wings. Within Coniopterygidae, Semidalis can be separated from the closely related Conwentzia by phylogenetic and subtle morphological differences. Larvae recognized by their alligator-like shape, small size, and presence on plant surfaces during winter when most other predatory insects are inactive.
Appearance
are minute insects with bodies and wings covered in a dense layer of white wax produced by abdominal glands. The waxy coating appears as a fine powder, sometimes with light grayish or yellowish tints. Wings have simple venation. Larvae resemble tiny chubby alligators, measuring less than 5 mm, with elongated bodies and prominent mouthparts.
Habitat
Found on bark of trees, undersides of leaves, and fruit. Active in winter in temperate regions when temperatures are mild enough. Collected from forested areas including Longchuan Forest Park in Yunnan Province, China.
Distribution
Almost . Documented from Europe (Denmark, Norway, Sweden), southern China (Yunnan, Guangzhou, Guizhou), and Africa. The Coniopterygidae is absent only from extremely cold regions.
Seasonality
and larvae active year-round in suitable climates, with notable winter activity in temperate regions during warmish days. Specimens collected in March in southern China.
Diet
Predatory. Larvae and feed on very small soft-bodied arthropods including spider mites, scale insects, whiteflies, and other minute prey. Body fluids extracted via short sucking mouthparts.
Life Cycle
Larvae develop through multiple instars feeding on prey. Mature larvae spin silken cocoons on undersurfaces of leaves or other plant parts using silk glands in the ; silk extruded from the . Larva moves abdomen in circular motions to weave the cocoon over several hours. lasts approximately one week before .
Behavior
Larvae actively roam plant surfaces searching for prey. Both life stages are predatory. Larvae spin silken pupal chambers using abdominal silk glands, with the spinning process involving rhythmic abdominal movements.
Ecological Role
of agricultural and ornamental pests including spider mites on boxwoods, and citrus pests in Florida and California. Active during winter may provide early-season .
Human Relevance
Used in programs. Valued by arborists and landscape professionals for suppressing spider mite on boxwoods and other ornamental plants. Subject of training workshops due to its winter activity and pest control potential.
Similar Taxa
- ConwentziaSister within Coniopterygidae; distinguished by phylogenetic analysis and subtle morphological differences
- ConiopteryxAnother coniopterygid ; and broadly similar but distinct at genus level
More Details
Wax production
possess specialized glands lining the that produce ribbons of wax spread across the body surface, legs, and wings. This waxy coating likely aids in water retention.
Silk production
Larvae possess specialized silk glands within the ; silk is extruded from the rather than mouthparts, an unusual arrangement among insects.