Nymphalis

Kluk, 1780

tortoiseshells, anglewing butterflies

Species Guides

Nymphalis antiopa(Mourning Cloak)
Nymphalis californica(California Tortoiseshell)
Nymphalis l-album(Compton Tortoiseshell)

Nymphalis is a of brush-footed butterflies commonly known as tortoiseshells or anglewing butterflies. The genus name, established by Jan Krzysztof Kluk in 1780, has priority in zoological for this group. Members are characterized by cryptic wing patterns that provide camouflage during hibernation. All in this group overwinter as and are restricted to the northern hemisphere. The sister group is Vanessa.

Nymphalis l-album by (c) christine123, some rights reserved (CC BY), uploaded by christine123. Used under a CC-BY license.

NW81-10 Nymphalis californica (3430026818) by NSG group from Lund, Sweden. Used under a CC0 license.

NW81-16 Nymphalis l-album (3430029332) by NSG group from Lund, Sweden. Used under a CC0 license.

Pronunciation

How to pronounce Nymphalis: //nɪmˈfælɪs//

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

Identification

Anglewing butterflies are distinguished from similar by a cryptic silhouette and the distinctive coloration and pattern on the side of both wings. When wings are closed, the underside resembles dead leaves, providing camouflage. The forelegs are reduced to small, brush-like appendages typical of the brush-footed Nymphalidae. Related sometimes confused with Nymphalis include Aglais, Inachis, Polygonia, and Kaniska, which were historically treated as subgenera but are now often recognized as distinct.

Images

Habitat

varies by . Nymphalis xanthomelas requires natural or artificial surface waters with riparian willow vegetation; females oviposit almost exclusively on willow branches extending over water, and larvae develop above the water surface until . Nymphalis californica is associated with foothill canyons and high-altitude Ceanothus stands, with breeding localities varying widely year to year. Nymphalis antiopa occurs in diverse habitats including wooded areas and riparian zones, with willows and other plants.

Distribution

The is restricted to the northern hemisphere. Nymphalis antiopa is widely distributed across Europe and North America. Nymphalis californica occurs in western North America, with irregular mass extending its range. Nymphalis xanthomelas has a southern continental, West Siberian-centered distribution reaching its western limit in Central Europe; it formerly had permanent in Hungary until the 1970s-80s, with occasional mass migrations from eastern populations (Southwestern Ukraine, Western Romania) facilitating recolonization.

Seasonality

of all overwinter and become active in late winter or early spring, often flying before trees leaf out or wildflowers bloom. Nymphalis californica adults emerge in late May to early June, with a second emerging in late July; adults then estivate at high elevations before migrating downslope to hibernate in September-October. Nymphalis antiopa shows similar patterns with spring , summer breeding at variable elevations, and autumn downslope . Nymphalis xanthomelas exhibits obligate summer dormancy () as part of its .

Diet

Nymphalis xanthomelas has been observed feeding on moist soil patches, dead snails, and animal excrement during . Nymphalis antiopa feeds on oak tree sap, rotting fruit, and occasionally flower nectar. Larval diet is restricted to specific plants: willows (Salix spp.) for N. xanthomelas and N. antiopa; Ceanothus for N. californica.

Host Associations

Salix (willow) - larval Primary for N. xanthomelas (especially Salix caprea and S. fragilis) and N. antiopa
Ceanothus (wild lilac) - larval for N. californica, including Ceanothus velutinus (snowbrush) and C. parvifolius (tobaccobrush)
Populus (cottonwood, aspen) - larval Recorded for N. antiopa
Ulmus (elm) - larval Recorded for N. antiopa
Betula (birch) - larval Recorded for N. antiopa
Celtis (hackberry) - larval Recorded for N. antiopa

Life Cycle

All overwinter as , hidden in shelters. Nymphalis xanthomelas: laid on willow branches over water; larvae develop above water surface; occurs above water; obligate follows adult . Nymphalis californica: larvae feed gregariously without webbing; pupate en masse on bare stems; adults emerge and almost immediately emigrate; estivate at high elevations above tree line; live 9-10 months as adults. Nymphalis antiopa: single in Sacramento Valley with resulting adults migrating upslope to breed in mountains; reverse downslope by next in late September-October.

Behavior

hibernation is a defining trait; butterflies are in shelters with wings closed, exposing only the cryptic surface. Nymphalis californica exhibits mass at irregular intervals, with adults emigrating north or east and upslope immediately after ; estivating adults aggregate in large numbers at high elevations. Nymphalis xanthomelas shows directional westward migration during explosions, with sustained at 1-20m height; migrants feed briefly without settling, continuing within seconds. Nymphalis antiopa has been observed exhibiting interspecific territorial defense against a diurnally active big brown bat (Eptesicus fuscus), including pursuit and aerial attacks. Adults of N. xanthomelas are described as extremely shy, unlike the more settled N. polychloros.

Ecological Role

Larvae can function as significant herbivores; Nymphalis californica larvae in years defoliate whole stands of Ceanothus. Nymphalis xanthomelas serves as an for riparian wetland in Hungary, where it is protected with high conservation value. The is parasitized by Telenomus kolbei (Hymenoptera: Scelionidae), which oviposits into . Occasional mass may facilitate recolonization of former habitats and genetic exchange between .

Human Relevance

Nymphalis californica mass occasionally tie up traffic and attract public attention; high-altitude hikers frequently misidentify estivating tortoiseshells as monarchs. Nymphalis antiopa is the state insect of Montana. Nymphalis xanthomelas is protected in Hungary with a conservation value of 50,000 HUF per specimen. The has been studied extensively for climate and seasonality research, with long-term monitoring records dating to 1972 in central California.

Similar Taxa

AglaisAlso called tortoiseshells; historically sometimes included in Nymphalis as a subgenus; now usually treated as distinct
PolygoniaAlso called anglewing butterflies; historically sometimes included in Nymphalis as a subgenus; now usually treated as distinct ; similar cryptic wing patterns
InachisHistorically sometimes included in Nymphalis as a subgenus; now usually treated as distinct
KaniskaHistorically sometimes included in Nymphalis as a subgenus; now usually treated as distinct
VanessaSister group to Nymphalis; includes painted ladies and admirals; similar brush-footed but generally lacks the pronounced cryptic patterning of anglewings

More Details

Taxonomic Priority

The name Nymphalis, established by Kluk in 1780, is the oldest name among generic names for anglewing butterflies and therefore has priority in zoological over later names. The collective term 'anglewing butterflies' derives from the Latinized term Papiliones angulati, probably first used by Ignaz Schiffermüller in 1775–1776.

Phylogenetic Relationships

Recent studies (Nylin et al. 2001; Wahlberg & Nylin 2003; Wahlberg et al. 2005, 2009, 2011) have clarified that anglewing butterflies evolved from a common ancestor, with Vanessa as the sister group to Nymphalis.