Callosamia securifera
Maassen
Sweetbay Silkmoth
Callosamia securifera, commonly known as the Sweetbay Silkmoth, is a saturniid native to southeastern North America. The was named after its obligate plant, sweetbay (Magnolia virginiana). Like other members of the Callosamia, larvae are highly specialized feeders, utilizing only a single tree species for development. are large, showy moths with reduced mouthparts and do not feed as adults.
Pronunciation
How to pronounce Callosamia securifera: /kæˌlɒˈseɪmɪə sɪˌkjʊərɪˈfɪərə/
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Identification
The three North American Callosamia —C. securifera, C. promethea, and C. angulifera—can be distinguished primarily by plant association and subtle wing pattern differences. Callosamia securifera is restricted to the range of Magnolia virginiana, while C. angulifera is associated with tulip tree (Liriodendron tulipifera) and C. promethea utilizes multiple host plants including sassafras and spicebush. of C. securifera and C. angulifera are difficult to distinguish morphologically; geographic distribution and host plant presence are the most reliable field identification characters.
Images
Habitat
Wetland forests and coastal plain woodlands where sweetbay (Magnolia virginiana) occurs. Sweetbay typically inhabits acidic, poorly drained soils in swamps, pocosins, and along stream margins.
Distribution
Southeastern United States, ranging from the coastal plain of Virginia south through the Carolinas, Georgia, and Florida, west along the Gulf Coast to eastern Texas. Distribution is constrained by the range of its plant, Magnolia virginiana.
Diet
Larvae feed exclusively on sweetbay (Magnolia virginiana). have non-functional mouthparts and do not feed.
Host Associations
- Magnolia virginiana - obligate larval was named for this plant; larvae cannot develop on other plants
Life Cycle
Complete with four stages: , larva, pupa, and . Larvae feed on sweetbay leaves, spinning silk to create shelters. occurs in a silken cocoon attached to plant branches or fallen leaves. Adults emerge in spring and early summer.
Ecological Role
Larval herbivore on sweetbay; serves as prey for birds, , and other . may contribute to pollination during their brief non-feeding adult stage, though this has not been documented.
Human Relevance
Subject of interest to lepidopterists and naturalists; occasionally reared by hobbyists. Not of economic importance. The ' restricted specificity makes it vulnerable to loss affecting wetland forests.
Similar Taxa
- Callosamia prometheaSimilar , but utilizes multiple plants (sassafras, spicebush, tulip tree) rather than sweetbay exclusively; more widespread in eastern North America
- Callosamia anguliferaNearly identical appearance, but associated with tulip tree (Liriodendron tulipifera); ranges farther north and inland than C. securifera
More Details
Taxonomic etymology
The specific epithet 'securifera' and 'Sweetbay Silkmoth' both reference the ' obligate association with Magnolia virginiana, commonly known as sweetbay or sweetbay magnolia.
Conservation considerations
The extreme specificity of C. securifera makes it dependent on intact wetland forest supporting Magnolia virginiana. Loss of these habitats to development and drainage represents the primary threat to the .