Attacus taprobanis

Definition
Attacus taprobanis is a species of moth in the family Saturniidae, commonly referred to as a giant silk moth. It is reported from the island of Sri Lanka.

Overview

• Taxonomic classification:

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Insecta
  • Order: Lepidoptera
  • Family: Saturniidae
  • Genus: Attacus
  • Species: Attacus taprobanis (Moore, 1858)

• Distribution and habitat: The species is known from Sri Lanka, where it inhabits tropical and subtropical forested areas, often at low to mid elevations. Records from southern India exist but are less frequent and may represent related taxa.

• Biology: Like other members of the genus, A. taprobanis undergoes a complete metamorphosis with egg, larval (caterpillar), pupal, and adult stages. The larvae feed on a variety of host plants, including species of Terminalia and Ricinus. Adults have reduced mouthparts and do not feed, focusing on reproduction.

Etymology / Origin
The specific epithet taprobanis derives from “Taprobane,” the classical name used by Greek and Roman geographers for the island of Sri Lanka. This reflects the moth’s primary geographic occurrence.

Characteristics

• Size: Adults possess a large wingspan, typically ranging from 180 mm to 250 mm, making them among the largest moths in the region.
• Wing pattern: The forewings are brownish‑tan with a network of darker lines and prominent eye‑spot markings near the wing margins. Hindwings are similarly colored but display larger, more conspicuous ocelli edged with bright orange or yellow scales.
• Sexual dimorphism: Females are generally larger and have a broader abdomen to accommodate egg production, while males may have slightly more feathery antennae for pheromone detection.
• Life cycle: The caterpillars are initially dark green with a dorsal stripe, later becoming mottled brown as they mature. Pupation occurs within a silk cocoon attached to vegetation or hidden in leaf litter.

Related Topics

• Attacus atlas – the Atlas moth, a widely distributed relative with similar morphology.
• Saturniidae – the family of giant silk moths, notable for large size and eye‑spot wing patterns.
• Lepidoptera of Sri Lanka – the broader assemblage of butterflies and moths recorded from the island.
• Silk production – some Attacus species have historically been studied for silk‑like fibers produced during cocoon construction.

Note: Taxonomic treatment of Attacus taprobanis varies among authorities; some consider it a distinct species, while others treat it as a regional form or synonym of Attacus atlas. Current consensus leans toward recognizing it as a valid species endemic to Sri Lanka, but further molecular studies are required for definitive clarification.