Cotton-Gall Tephritid

aciurina bigeloviae

The Cotton-Gall Tephritid, Aciurina bigeloviae, is a fascinating example of insect-plant interaction, specifically known for inducing distinctive cottony galls on its host plant, rubber rabbitbrush (Ericameria nauseosa). This small fly, belonging to the fruit fly family Tephritidae, plays a critical ecological role in the arid and semi-arid ecosystems it inhabits across western North America. The larvae of this species are the architects of these unique plant structures, modifying plant growth to create a protective home and food source. Studying A. bigeloviae provides insights into co-evolutionary relationships, insect morphology, and the intricate ways insects can manipulate plant physiology for their survival, making it a compelling subject in entomology.

Habitat: This species is typically found in arid and semi-arid shrublands, grasslands, and desert environments where its primary host plant, rubber rabbitbrush (Ericameria nauseosa), is abundant.

Appearance

Adults of Aciurina bigeloviae are small flies, typically measuring 0.3-0.5 cm in length, with a compact, somewhat robust body and prominent reddish-brown compound eyes. Their body coloration is generally yellowish-brown or light brown, often featuring subtle darker markings on the thorax and abdomen. A key diagnostic feature is their wings, which exhibit a characteristic intricate pattern of dark bands and spots, typical of many Tephritid fruit flies, and are usually held in a slightly V-shape at rest. Larvae are cream-colored maggots, entirely concealed within their cottony galls.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderDipteraFamilyTephritidaeGenusAciurina

Cotton-Gall Tephritid

Interesting facts

Aciurina bigeloviae belongs to the Tephritidae family, often referred to as 'true fruit flies,' though many species, like this one, are gall-formers rather than fruit pests.

The distinctive galls created by Aciurina bigeloviae are often mistaken for cotton bolls due to their white, fuzzy appearance, giving the fly its common name.

The host plant, Ericameria nauseosa (rubber rabbitbrush), was once investigated as a potential source of natural rubber during periods of rubber scarcity.

The intricate internal structure of the gall is not random; it is precisely manipulated by the larval fly's biochemical signals to create specific chambers for feeding and protection.

Special abilities

The larvae possess the unique ability to induce the formation of a distinct, cottony, multi-chambered gall on the stems of their host plant, providing both shelter and nutrition.

Aciurina bigeloviae exhibits high host specificity, primarily targeting Ericameria nauseosa (rubber rabbitbrush), ensuring reliable resource availability in its native range.

The larvae excrete biochemicals that manipulate the plant's growth hormones, causing the stem tissue to develop into a highly specific and protective structure around them.

Measurements & details

Length: 0-1 cm
Wingspan: 0-1 cm
Weight: 0.000001-0.00001 kg
Lifespan: 0 years
Top Speed: 5 km/h
Clutch Size: 50-200
Incubation: 5-10 days

Diet & Feeding

Larval Cotton-Gall Tephritids are herbivorous endoparasites, feeding exclusively on the modified plant tissues within the galls they induce on rubber rabbitbrush. Adult flies primarily feed on nectar from flowers or honeydew secreted by other insects.

Age differences: Larvae feed exclusively on specific plant tissues within the galls, while adult flies consume liquid food sources like nectar and honeydew.

Primary Foods

Ericameria nauseosa stem tissue (larvae)
Nectar (adults)
Honeydew (adults)

Foraging Method

Larvae Are Sessile Gall Formers, Consuming Plant Tissue From Within; Adults Are Foraging, Collecting Liquids From Plant Surfaces Or Flowers.

Ecological connections

host plant

Rubber Rabbitbrush

Ericameria nauseosa

The primary host plant, providing essential resources and shelter for the larval stage through gall formation.

parasite

Gall Parasitoid Wasp

Eurytoma sp.

Various species of parasitic wasps lay their eggs within the galls, and their larvae then feed on the developing Cotton-Gall Tephritid larvae.

eaten by

Common Garden Spider

Araneus diadematus

Adult Cotton-Gall Tephritids, being small and slow-moving, are a potential food source for generalist insect predators.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

Collections for this object will appear here as more themes are added.

Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Cotton-Gall Tephritid?

The easiest way to identify Cotton-Gall Tephritid is to use the Snappit nature identifier app.

How long is Cotton-Gall Tephritid?

0-1 cm

What is Cotton-Gall Tephritid's wingspan?

0-1 cm

How much does Cotton-Gall Tephritid weigh?

0.000001-0.00001 kg

How long does Cotton-Gall Tephritid live?

0 years

How fast can Cotton-Gall Tephritid move?

5 km/h

What does Cotton-Gall Tephritid eat?

Where is Cotton-Gall Tephritid usually found?

This species is typically found in arid and semi-arid shrublands, grasslands, and desert environments where its primary host plant, rubber rabbitbrush (Ericameria nauseosa), is abundant.