Anthela acuta

Anthela acuta (Walker, 1855)
(one synonym : Darala excisa)
Common Anthelid
ANTHELINAE , ANTHELIDAE

Don Herbison-Evans ( donherbisonevans@yahoo.com )
and
Stella Crossley & Peter Marriott

(updated 24 February 2009)

Anthela acuta

This species starts life as an irregular row of buff coloured eggs each with a length of about 1 mm. They are laid, often in a row, on the leaf of a food plant.

early instar
(Photo: courtesy of the Macleay Museum, University of Sydney)

The Caterpillar is brown and hairy with a brown head capsule and a white adfrontal area. Its head looks as though it has two large brown eyes. The hairs are in tufts of brown and white, with a longer pair of tufts on the thorax. There is a double row of white spots (verrucae) all along the back, except on the last three segments, they are pink. The pair of white spots on the thorax are larger than those on the abdomen.

The species has been little studied, and the one name is probably being used to cover a number of similar species. Their Caterpillars appear to differ in the number and placing of the pink spots. The race illustrated here feeds on:

various Grasses ( POACEAE ),

but another race in which the Caterpillar has all white spots (and no pink ones) has been found feeding on:

Musk Daisy Bush ( Olearia argophylla, ASTERACEAE ), and

various Wattles ( Acacia, MIMOSACEAE ).

In Tasmania, Caterpillars of what appear to be the same species only accept :

English Oak ( Quercus robur, FAGACEAE ), and

European Beech ( Fagus sylvatica , FAGACEAE ).

later instar
(Photo: courtesy of the Macleay Museum, University of Sydney)

It grows to a length of 5 cms. It pupates in a double-walled cocoon in the debris on the ground. The cocoon has a length of about 3 cms.

The male moth is basically buff colored. The fore wings each have two brown spots and a thin brown line running parallel to the margin. The hind wings have a sparse row of brown dots running along an arc parallel to the margin. However variants frequently occur that have various degrees of dark blotching, as well as having a background colour varying from orange to fawn and even a greenish colour. All varieties of males have a wing span of about 3 cms.

Anthela acuta
Males
(Specimens: courtesy of the Macleay Museum, University of Sydney)

The females look completely different. They are much bigger, having a wing span of about 5 cms. However they have the same coloration: basically buff with a pattern of darker lines.

Female
(Specimen: courtesy of the Macleay Museum, University of Sydney)

Specimens have been taken all down the eastern part of Australia, for example in Bundaberg, Sydney, and Melbourne. In Melbourne, adults may be found most months of the year.

We have counted the number of adults we encountered in each month of the year :

area	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	-	-	7	19	11	1	-	4	10	10	-	1
Victoria	37	25	17	4	-	4	2	4	20	41	45	42