Asterocampa

Röber, 1916

Hackberry Butterflies, American Emperors

Species Guides

Asterocampa celtis(Hackberry Emperor)
Asterocampa clyton(tawny emperor)
Asterocampa leilia(Empress Leilia)

Asterocampa is a of butterflies in the Nymphalidae, commonly known as hackberry butterflies or American emperors. The genus contains four recognized distributed primarily in North and Central America and the Caribbean. Two species groups are recognized: the celtis group (hackberry emperor and Empress Leilia) and the clyton group (tawny emperor and dusky emperor). All species are closely associated with hackberry trees (Celtis spp.) as larval plants.

Asterocampa celtis antonia by (c) James Todd McCann, some rights reserved (CC BY), uploaded by James Todd McCann. Used under a CC-BY license.

Asterocampa clyton P1080800a by
xpda. Used under a CC BY-SA 4.0 license.

Asterocampa celtis antonia (Hackberry Emperor) larva by Kristof Zyskowski & Yulia Bereshpolova. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Asterocampa: /æstəroʊˈkæmpə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Members of Asterocampa can be distinguished from other Nymphalidae by their association with Celtis plants and their characteristic wing patterns. The celtis group (A. celtis and A. leilia) exhibits different wing patterns than the clyton group (A. clyton and A. idyja). Specific identification to species level requires examination of wing pattern details and, in some cases, genitalia.

Images

Habitat

River bottoms and riparian areas where hackberry trees (Celtis spp.) occur. The desert hackberry (A. leilia) inhabits desert environments associated with hackberry plants. in the are found in wooded areas, urban parks, and natural stands of their host trees.

Distribution

North America, Central America, and the Caribbean. Specific distribution varies by : A. celtis (hackberry emperor) is widespread in eastern North America; A. leilia (Empress Leilia/desert hackberry) occurs in southwestern United States and Mexico; A. clyton (tawny emperor) ranges across eastern and central North America with extending into the Southwest; A. idyja (dusky emperor) occurs in Mexico and Central America.

Diet

Larvae feed exclusively on of Celtis (hackberry/sugarberry), including Celtis occidentalis (common hackberry) and Celtis laevigata (sugarberry). have been observed feeding on sap flows, rotting fruit, and other non-floral sources; they rarely visit flowers for nectar.

Host Associations

Celtis occidentalis - larval common hackberry
Celtis laevigata - larval sugarberry
Celtis - larval hackberry/sugarberry

Life Cycle

Complete with , larva, pupa, and stages. Larvae develop on Celtis plants. Specific details of sites and stage vary by and require further documentation.

Behavior

Males employ two primary mate-locating tactics: perching (waiting at strategic locations for females to pass) and patrolling (actively flying through searching for females). Males may switch between these tactics based on environmental conditions and . Males engage in behavioral at mate encounter sites, adjusting body posture and positioning to regulate temperature. are known to form dense at sap flows on tree trunks, where they may exhibit reduced skittishness.

Ecological Role

Larvae are defoliators of Celtis trees. In some regions, dense can cause noticeable defoliation of sugarberry. serve as prey or food source for various and may contribute to nutrient cycling through their feeding on sap flows and rotting fruit.

Human Relevance

Occasional pest of hackberry/sugarberry trees due to larval defoliation. Dense swarms have been reported, leading to litigation in some areas. Generally considered a benign with minor economic impact. are occasionally observed in urban areas where trees are present.

Similar Taxa

ApaturaBoth are in Apaturinae and share similar (emperors), but Apatura occurs primarily in Eurasia and lacks the strict Celtis association of Asterocampa
DoxocopaNew World apaturine sometimes called emperors; differs in wing and plant associations

More Details

Species Groups

The is divided into two groups based on and associations: the celtis group (A. celtis, A. leilia) and the clyton group (A. clyton, A. idyja)

Sap-feeding Behavior

frequently aggregate at sap flows on tree trunks, where they may be found with beetles, flies, and other insects. This makes them unusually approachable compared to other butterflies.