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Symmoca signatella, commonly known as the Dockland Moth, is a small species of micro-moth belonging to the family Autostichidae. It is noted for its status as an introduced species in several parts of the world outside its native European range.
Physical Characteristics
• Size: It has a wingspan of 12–15 mm, with a forewing length typically between 6–8 mm.
• Appearance: The forewings are ash-gray, adorned with distinct brown or black spots and markings in the discal and post-discal regions. These dark patterns are occasionally accompanied by subtle yellowish or white shading. Its hindwings are uniformly grayish-brown.
Distribution & Habitat
• Native Range: Widely distributed across Western Continental Europe, extending to regions like Italy, Lithuania, Croatia, Greece, and southern Russia.
• North America: Introduced to the United States around 1942 (first discovered in California). It has since spread across the West Coast up to Oregon and has been documented in Eastern states including Illinois, Maryland, Massachusetts, New Jersey, and New York.
• British Isles: It is classified as an adventive species in the UK. It is infrequently recorded near docks, warehouses, and urban areas (such as London, Leicestershire, and Bedfordshire), typically arriving via accidental imports of European produce.
Diet and Life Cycle
• Larval Food: The larvae are detritophagous, meaning they feed primarily on dried vegetable matter, plant debris, and decaying materials. They are frequently observed feeding on the dry leaves and accumulated stem debris of Rosemary (Rosmarinus officinalis), binding the debris together with light silken webbing. They have also been associated with scavenged matter on ornamental plants and trees like Citrus and Cupressaceae.
• Flight Period: Adults are univoltine (producing one generation per year) and fly primarily from June to September, depending on the latitude and climate. They are nocturnal but are only rarely attracted to artificial light sources.
