Galapagos Species Database

The Galapagos Species Database shares the information about the species from our Natural History Collections.

Stegasta zygotoma Meyrick, 1917

Barrenador de los brotes, Twirler moth-gelechiid moth

The forewing markings of this species are unlike any others among the gelechiids recorded from the galapagos, except Stegasta francisci sp. n., described below. The dorsally connected subbasal and median ochreous triangular patches and the patches of silver, shining scales at 1/10, 1/4, 1/2, and 2/3 are especially diagnostic of these two species. Within the genus, S. zygotoma resembles the new speciesdescribed below, S. comissata Meyrick, 1923, and S. bosqueella (Chambers, 1875). itdiffers from Stegasta francisci sp. n. externally by the paler head, presence of dark brown at apex of labial palpus, and presence of three rings of paler, beige scales b. landry 704 & l. roque-albelo towards the apex of the flagellum, i.e. the apical 2 flagellomeres are dark brown, the previous one is beige distally, the previous 3 are dark brown, the previous one beige distally, etc. The differences in genitalia are discussed below in the diagnosis of the new species. Stegasta comissata appears to be a smaller species as its lectotype is 8 mm in wingspan (10 mm for a paralectotype female) and that of zygotoma is 11 mm. in addition, the head of S. comissata is cream coloured, whereas that of S. zygotoma is brown with the scales mostly pale brown with their tips dark brown (in galapagos specimens) (Landry & Roque, 2010).

Host plant is unknown. Specimens have been collected near sea level in March.

Taxonomy

Domain
Eukaryota

Kingdom
Animalia

Phylum
Arthropoda

Class
Insecta

Order
Lepidoptera

Superfamily
Gelechioidea

Family
Gelechiidae

Genus
Stegasta

Species
zygotoma

Taxon category: Accepted

Origin: Native

Distribution

Map of specimen collection localities or observation records for this species in our collections database.

Distribution: Santa Cruz (Landry, & Roque-Albelo, 2010), Floreana, Isabela (Roque, 2006).

References

  • Landry, B. Roque-Albelo, L. (2010) The Gelechiidae (Lepidoptera) of the Galápagos Islands, Ecuador, a taxonomic revision. Revue Suisse de Zoologie 117(4): 697-770.
  • Roque-Albelo, L. Landry, B. (2016) CDF Checklist of Galapagos Butterflies and Moths Charles Darwin Research Station, Puerto Ayora, Ecuador, 32 pp.

You are welcome to download and use the information found in this page, acknowledging its source.

This page should be cited as follows:

"Galapagos Species Database, Stegasta zygotoma", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=7349. Accessed 1 November 2026.