Callosamia

Adults are large silkmoths with elongated tails on the hindwings, similar to but distinct from the related genus Actias (luna moths). The three species can be distinguished by host plant associations and, in the case of C. securifera versus C. angulifera, by mating time: C. securifera is diurnal (midday activity 10 a.m. to 3 p.m.) while C. angulifera is nocturnal. C. promethea is polyphagous on multiple plant families whereas C. securifera is monophagous on sweetbay magnolia and C. angulifera specializes on tuliptree.

Deciduous and mixed woodlands containing host trees; distribution tied to presence of specific larval food plants including magnolias, tuliptree, black cherry, sassafras, and spicebush.

Eastern North America; records include Vermont and surrounding regions. Species distributions correspond to ranges of their respective host plants.

C. securifera is double-brooded annually. Adult flight periods vary by species and generally correspond with seasonal availability of host plant foliage.

Larvae feed on foliage of woody plants in multiple families. C. promethea has a broad host range including black cherry (Prunus serotina), tuliptree (Liriodendron tulipifera), sassafras (Sassafras albidum), spicebush (Lindera benzoin), and paper birch (Betula papyrifera). C. securifera is monophagous on sweetbay magnolia (Magnolia virginiana). C. angulifera specializes on tuliptree (Liriodendron tulipifera).

• Magnolia virginiana - larval food plantsole host of C. securifera; contains neolignan compounds (magnolol, biphenyl ether) that C. securifera uniquely tolerates
• Liriodendron tulipifera - larval food plantprimary host of C. angulifera; also used by C. promethea
• Prunus serotina - larval food plantcommon host of C. promethea
• Sassafras albidum - larval food plantshared host between C. promethea and C. angulifera
• Lindera benzoin - larval food planthost of C. promethea
• Betula papyrifera - larval food planthost of C. promethea; tuliptree lineages show inability to survive on this species
• Magnoliaceae - host familyfamily-level association for the genus

Complete metamorphosis with egg, larval, pupal, and adult stages. Larvae pass through multiple instars (at least three recorded). Cocoon construction behavior varies by species: C. promethea larvae roll a single leaf into a tube, sheath the petiole and stalk with silk, and bind the cocoon firmly to the tree; C. angulifera gathers multiple leaves as a cover without stalk-sheathing, resulting in cocoons that commonly fall to ground when leaves shed. C. securifera is double-brooded annually.

Mating activity in C. securifera is strictly diurnal, occurring between 10 a.m. and 3 p.m., while C. angulifera is entirely nocturnal—this temporal isolation likely maintains reproductive isolation between these sibling species. Larvae exhibit defensive behaviors including mandible clicking (in final instar), regurgitation of gut contents, and thrashing movements when disturbed; regurgitation is more effective than thrashing in C. promethea. Host selection behavior is genetically influenced: F1 hybrids of C. promethea × C. angulifera resemble the male parent in food preferences. Cocoon-spinning behavior shows polygenic inheritance with continuous variation between parental types in hybrids.

Larvae function as folivores on woody plants, potentially influencing leaf chemistry and nutrient cycling in forest ecosystems. Their specialized host associations contribute to understanding plant-insect coevolution, particularly regarding chemical defenses (neolignans in Magnolia virginiana).

Subject of behavioral and evolutionary research due to hybridization potential and distinct species-specific behaviors. Larvae of C. promethea are sometimes used in educational settings for rearing demonstrations. Adults are sought by collectors and photographers for their aesthetic appeal.

• ActiasBoth are Saturniidae genera with elongated hindwing tails; Callosamia species are generally smaller with different wing patterns and host associations
• HyalophoraSaturniidae genus with similar large size and larval defensive behaviors (clicking, regurgitation); Hyalophora cecropia has been directly compared in defensive behavior studies with C. promethea

• Saturniidae
• silkmoths
• North America
• host specialization
• temporal isolation
• chemical ecology
• hybridization
• defensive behavior
• diurnal mating
• Magnolia virginiana
• Liriodendron tulipifera

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Sphingidae | Beetles In The Bush | Page 2
• The Moth and Me | Beetles In The Bush
• Saturniidae | Beetles In The Bush | Page 2
• Noctuidae | Beetles In The Bush | Page 3
• blog carnivals | Beetles In The Bush
• Defensive Behavior in Callosamia promethea and Hyalophora cecropia (Lepidoptera: Saturniidae)
• Lack of physiological improvement in performance of Callosamia promethea larvae on local host plant favorites
• Phenylpropenoid phenolics in sweetbay magnolia as chemical determinants of host use in saturniid silkmoths (Callosamia)
• Some Interactions Between Flight, Protective Display, and Oviposition Behaviour in Callosamia and Rothschildia Spp. (Lepidoptera, Saturniidae)
• Mating Behavior and Life Habits of the Sweet-Bay Silk Moth ( Callosamia carolina )
• Note On the Inheritance of Behavior Patterns for Food Selection and Cocoon Spinning in F 1 Hybrids of Callosamia Promethea x c. Angulifera