Pyraustinae

Meyrick, 1890

Tribe Guides

3

Pyraustinae is a large of crambid snout moths ( Crambidae) comprising approximately 1,280-1,400 described across 171 . The group is predominantly tropical in distribution but extends into temperate regions of North America and Europe. The subfamily is characterized by distinctive morphological features of the male genitalia and tympanal organs. Many species have larvae that bore into plant stems and fruits, with several genera—notably Ostrinia—containing significant agricultural pests. The subfamily has undergone substantial taxonomic revision, with the former tribe Spilomelini now elevated to subfamily rank as Spilomelinae.

Saucrobotys futilalis by (c) David George, some rights reserved (CC BY), uploaded by David George. Used under a CC-BY license.Perispasta caeculalis by (c) brendanboyd, some rights reserved (CC BY). Used under a CC-BY license.Perispasta caeculalis by (c) Andy Reago & Chrissy McClarren, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Pyraustinae: //pɪ.raʊˈstɪni//

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Identification

Pyraustinae can be distinguished from other crambid by several internal morphological characters: atrophied spinula and venulae in the tympanal organs; a narrow fornix tympani; a longitudinal groove with androconial on the male mesothoracic tibiae; an often spinose antrum; and a sella (medially directed clasper on the inside of the valvae) with an editum bearing modified setae on the male valvae. External is highly variable across the subfamily, precluding simple visual identification.

Images

Habitat

are diverse and include rainforest edges, savannah-rainforest transitions, mountainous regions from 462-1800 m elevation, and riverine areas. Specific locality records include rainforest edges in Kenya, savannah habitats in Tanzania, and montane regions in the Arabian Peninsula.

Distribution

Widespread across tropical and temperate regions. The Afrotropical zone harbors 160 ; the extends to the Arabian Peninsula representing its northern boundary in that region. Present in North America, Europe, Central and South America, and across the Palearctic, Oriental, and Australasian regions.

Diet

feed on nectar. Larval feeding habits are diverse; many bore into stems and fruits of plants. Specific plant associations include leguminous plants (Fabaceae) for Uresiphita reversalis, which feeds on Sophora secundiflora, Genista species, Lupinus, Acacia, and Baptisia.

Host Associations

Life Cycle

duration varies considerably depending on season and latitude. In Uresiphita reversalis, the cycle ranges from five weeks under optimal summer conditions in southern regions to 25 weeks in winter in northern areas. Multiple occur annually—up to four or five in favorable conditions. typically occurs in the pupal stage, though may persist in some regions. are laid in clusters averaging approximately 19 per clutch. Larvae progress through five instars. occurs within an opaque white cocoon woven amid dense larval webbing.

Behavior

are and strongly attracted to ultraviolet light sources including UV tubes, UV power-LEDs (365-385 nm), mercury vapor lights, and black lights. Some are and easily startled from resting positions. Larvae of Uresiphita reversalis feed gregariously and diurnally—unusual traits among caterpillars—while most pyraustine larvae are concealed feeders in stems, fruits, or rolled leaves.

Ecological Role

Larvae function as herbivores, with many acting as stem borers and fruit borers. Some species serve as prey for including mason wasps (Euodynerus foraminatus) and other solitary wasps. The includes species that have become economically significant pests in agricultural systems.

Human Relevance

Several , particularly in the Ostrinia, are serious agricultural pests. The European corn borer (Ostrinia nubilalis) is among the most economically damaging lepidopteran pests in temperate agriculture. Uresiphita reversalis (Sophora Worm or Genista Broom Moth) is a pest of ornamental and native leguminous plants. Larval feeding damage includes stem boring and fruit boring that reduces crop yields and plant vigor.

Similar Taxa

  • SpilomelinaeFormerly treated as tribe Spilomelini within Pyraustinae; now elevated to rank. Spilomelinae is the larger of the two groups derived from the historical Pyraustinae sensu lato and contains more than Pyraustinae as currently circumscribed. Distinguishing features rely on genitalic and tympanal characters.
  • CrambinaeAnother of Crambidae; some authorities historically treated Crambidae as subfamily Crambinae of Pyralidae, with Pyraustinae as a separate subfamily within Pyralidae. Modern classification places both as subfamilies of Crambidae.

Sources and further reading