Map Snapshot
2 Records
Status
Milbert's Tortoiseshell (Aglais milberti) is a distinctive species with northern affinities, apparently occurring in Maryland only as a rare stray. It has been recorded from Allegany and from Carroll Counties, presumably originating from populations in Pennsylvania. Elsewhere in North America, this species ranges from the Mid-Atlantic through New England and into maritime Canada, through the boreal forest to Alaska, and westwards to the Pacific coast (Brock & Kaufman, 2003).
Relationships
This species uses nettles (Urtica spp.) as larval hosts.
Seasonality Snapshot
Source: Wikipedia
| Aglais milberti | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Nymphalidae |
| Genus: | Aglais |
| Species: | A. milberti
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| Binomial name | |
| Aglais milberti | |
| Subspecies | |
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| Synonyms | |
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Aglais milberti, the fire-rim tortoiseshell or Milbert's tortoiseshell, is considered the only species of the proposed Aglais genus that occurs in North America.
Description
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The wingspan is between 4.2 and 6.3 cm and the forewing's tips are squared off. The upperside is black with wide orange submarginal bands; this orange slightly fades to yellow near the inner edge. Both wings have narrow black marginal borders; the hindwing may have blue spots.[2]
Behaviour
[edit]This is a quick species that flits rapidly around woodland roads. When it lands it may open its wings, often on trees or rocks.
Range and habitat
[edit]Milbert's tortoiseshell's range includes all of Canada and Alaska south of the tundra, all of the western United States and most of the eastern United States. In these areas they commonly occur in wet areas, including moist pastures, marshes, most trails, and roadsides.
Life cycle
[edit]There are two broods from May to October. During this time adults mate and lay eggs. The female will lay her eggs in bunches of up to 900 individuals on the underside of the host plant's leaves. Early-instar caterpillars eat together in a web, but later instars feed alone. They hibernate as adults, often in small congregations. Adults have been known to mate in low-elevation watercourses in arid regions.
Larval foods
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- Urtica dioica – stinging nettle
- Urtica procera – tall nettle
- Pilea pumila – clearweed[3]
Adult foods
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References
[edit]- ^ Latreille, Pierre André; Godart, Jean Baptiste (1819). "Histoire naturelle. Entomologie, ou histoire naturelle des crustacés, des arachnides et des insectes". Encyclopédie Méthodique. 9 (1): 3–328 (p. 307).
- ^ "Species Aglais milberti - Milbert's Tortoiseshell - Hodges#4433". bugguide.net. Retrieved 2008-11-18.
- ^ "Clearweed". Hennepin County Master Gardeners. Regents of the University of Minnesota. 2022. Retrieved 4 August 2022.
- Kaufman, Kenn; Brock, Jim P. (2003). "Tortoiseshells". Kaufman Field Guide to Butterflies of North America. Houghton Mifflin Company. pp. 200. ISBN 978-0-618-76826-4.
- "Species Detail Milbert's Tortoiseshell". Archived from the original on 2008-10-18. Retrieved 2008-11-18.
- "Nymphalis". Archived from the original on 17 October 2008. Retrieved 2008-11-18.
- Milbert's Tortoiseshell, Butterflies of Canada