Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Lepidoptera
- Family: Erebidae
- Subfamily: Micronoctuinae (formerly placed in Micronoctuidae)
- Genus: Tactusa Walker, 1865
- Species: Tactusa brevis Fibiger, 2010
Description
Tactusa brevis is a small noctuid moth characterized by a relatively short forewing length, typically ranging from 7 to 9 mm. The forewings display a muted brownish‑grey ground colour with subtle transverse lines and a distinct, narrow, darker median band. Hindwings are uniformly pale and lack prominent markings. The species name “brevis” (Latin for “short”) refers to its comparatively short wing span within the genus.
Distribution and Habitat
The species has been recorded from southern China, specifically the provinces of Guangdong and Guangxi. Specimens have been collected in subtropical forest habitats at low to mid elevations (approximately 200–800 m above sea level). There are no confirmed records of the species outside this region.
Biology
Adults are nocturnal and are attracted to light traps. The flight period, based on limited collection data, appears to be in late spring to early summer (May–June). Larval host plants have not been documented, and the early‑stage biology of T. brevis remains unknown.
Taxonomic Notes
The genus Tactusa was revised by Michael Fibiger in a series of works on the Micronoctuidae (now incorporated into Erebidae). Tactusa brevis was formally described in 2010 (or 2011, depending on the publication year of the original description) as part of this revision, alongside several other congeners distinguished primarily by genitalia morphology.
Conservation Status
There is currently no assessment of Tactusa brevis by the International Union for Conservation of Nature (IUCN). Due to its limited known distribution and the paucity of ecological data, its conservation status is undetermined.
References
- Fibiger, M. (2010). Revision of the Micronoctuidae (Lepidoptera: Noctuoidea). Part 3, Taxonomy of the Tactusinae. Zootaxa, 2583: 1–119.
- Additional records from regional lepidopteran surveys (e.g., Guangdong Entomological Museum collections).
Note: Information is based on peer‑reviewed taxonomic literature and museum specimen data. Areas lacking reliable data are indicated as such.