Yellow admiral

The yellow admiral or Australian admiral (Vanessa itea) is a butterfly native to Australia, New Zealand, Lord Howe Island, and Norfolk Islands. The Māori name is kahukowhai, which means "yellow cloak". The yellow admiral is a member of the family Nymphalidae, the subfamily Nymphalinae as well as the tribe Nymphalini. [1]

This article is about the butterfly. For the historical Royal Navy rank, see Admiral (United Kingdom); for the Patrick O'Brien Novel, see The Yellow Admiral.

Yellow admiral
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Nymphalidae
Genus: Vanessa
Species:
V. itea
Binomial name
Vanessa itea
(Fabricius, 1775)
Synonyms
  • Bassaris itea

Description

It is a medium-sized butterfly, with a variable wingspan of 48 to 50 mm in Tasmania,[2] and 48 to 55 mm in New Zealand.[3][4] The upperside of the forewings are dark brown to black toward the outer edges, with three small white patches and a wide, bright yellow bar, and dull red nearer the body. The rear wings are dull red with a black border, and a row of black circles with light blue centres near the edge.

Under wing detail

The underwings are very different - the rear wing is various shades of brown with cryptic, irregular markings; the underside of the forewing has a blue eyespot on a black background that is highlighted by a yellow area above and below.[5][6]

Distribution and habitat

Yellow admirals are relatively common throughout their range wherever their food plants occur. They prefer open country, wastelands and gardens where the stinging nettles, Urtica incisa and Urtica urens are present. It is found at up to 1000 m above sea level.[2]

It is a strong, fast flier, and is thought to survive wind-blown travel from Australia to New Zealand, across the Tasman Sea.

Life cycle

Eggs

The eggs are light green, ribbed and barrel shaped. They are usually laid singly, sometimes in pairs, onto the nettle leaves that the larva will eat.[2][6][7]

Larva

The caterpillars vary from black to grey, yellow-green or brown, with lighter coloured lines and spots running laterally along its back.[6][7] They are covered in several rows of spiny protrusions. They have six true legs, and ten prolegs.

They prefer to eat nettles and, depending upon availability, feed on Urtica incisa, Urtica urens,[2] Parietaria debilis, Pipturus argenteus,[6] Parietaria australis, Parietaria cardiostegia, Parietaria judaica, and Soleirolia soleirolii.[7] They feed at night; during the day they hide in a curled leaf for protection.[6]

They grow to about 30 mm long before pupating.[7][8] The pupa is about 20 mm long and is grey or brownish, with sharp bumps and has two white/silver spots on each side.[6][7]

Adult
Being long lived they often end up with damaged wing tips.

The flight period of the adult covers all the warmer months of the year and so varies with location, e.g. in Tasmania it is from November to May,[2] while in Victoria it is from September to April.[9] Individuals may live for several months. The adults feed on nectar from available flowers,[2] and sometimes sap seepage from trees.[6] Normally the last of the season's brood survive as larvae until the next season, but in some areas it survives as a dormant adult over winter.[7]

Parasites
Yellow admiral cocoon with Pteromalus puparum

In New Zealand the yellow admiral pupae have been parasitised by both the self introduced wasp species Echthromorpha intricatoria as well as the introduced wasp Pteromalus puparum.[10]

See also

References
  1. "1. Australian admiral". Australian Insect Common Names. Commonwealth Scientific and Industrial Research Organisation (Australia). 19 September 2004. Retrieved 20 September 2008.
  2. Daley, Elizabeth (2007). Wings: An introduction to Tasmania's winged insects. Riffles Pty Ltd.
  3. Leonie Clunie (23 August 2001). "Bug identification - Yellow Admiral". Retrieved 16 July 2009. also occurs in Australia
  4. Some sites say 60mm
  5. "Morwell National Park - Species - Vanessa itea". Retrieved 16 July 2009.
  6. "Vanessa itea". 16 July 2009. Archived from the original on 27 July 2008. Retrieved 20 July 2009.
  7. R. Grund (23 May 2008). "Vanessa itea data sheet". Retrieved 20 July 2009.
  8. Leonie Clunie (25 November 2013). "Yellow Admiral Caterpillar". Retrieved 16 March 2014.
  9. "Morwell National Park - Species - Vanessa itea". Retrieved 20 July 2009.
  10. "Yellow Admiral – Vanessa itea – Kahukowhai – Monarch Butterfly New Zealand Trust". monarch.org.nz. Retrieved 5 March 2019.
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