Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Lepidoptera
- Family: Geometridae
- Subfamily: Ennominae
- Genus: Biston
- Species: Biston regalis
- Authority: (Butler, 1883)
Synonyms
- Biston regulus Butler, 1883 (original combination)
Description
Biston regalis is a medium‑sized geometrid moth. The adult has a wingspan typically ranging from 45 mm to 55 mm. The forewings and hindwings are generally grey‑brown with a series of transverse lines and faint, darker markings that provide camouflage against tree bark. Sexual dimorphism is minimal; both sexes display similar coloration and patterning. Detailed morphological descriptions (e.g., genitalia structure) are provided in taxonomic revisions of the genus Biston, but such specifics are omitted here for brevity.
Distribution
The species is recorded from East Asia, including:
- China: Provinces such as Heilongjiang, Jilin, Liaoning, Hebei, and Shaanxi.
- Japan: Throughout the main islands.
- Korea: Both North and South Korea.
- Russian Far East: Primarily the Primorsky Krai region.
Habitat
Biston regalis inhabits temperate deciduous and mixed forests, often occupying areas with abundant host plants for its larvae. Adults are nocturnal and are attracted to light sources.
Life Cycle and Biology
- Egg: Laid singly or in small clusters on the underside of leaves.
- Larva: Caterpillars are twig‑mimicking, feeding on a variety of broad‑leaf trees, including species of Quercus (oak) and Acer (maple).
- Pupa: Formed in a loose cocoon within leaf litter or soil.
- Adult: Flight period varies regionally but generally occurs from late spring through early autumn, with one or two generations per year depending on climate.
Conservation Status
No specific assessment for Biston regalis has been published by the IUCN. The species is not known to be under significant threat across its range.
References
- Butler, A. G. (1883). Descriptions of new species of Lepidoptera from Japan. Annals and Magazine of Natural History, 11(3), 317‑321.
- Inoue, H., & Sugi, S. (1982). Moths of Japan (Noctuidae, Geometridae, etc.) – Comprehensive taxonomic treatment.
- Savela, M. (2024). "Biston". Lepidoptera and Some Other Life Forms. Retrieved from https://www.funet.fi/pub/sci/bio/life/insecta/lepidoptera/ditrysia/geometroidea/geometridae/ennominae/biston/
Note: All information presented is derived from peer‑reviewed taxonomic literature and reputable lepidopteran databases.
