|Winter form of Precis octavia sesamus|
The southern subspecies (Precis octavia sesamus) has a summer form (natalensis) which is red with black markings, and a winter form (sesamus) which is blue with a line of red markings on the wings. The winter form is slightly larger than the summer form. In both forms the males and females are alike, however the females are slightly larger. Intermediate forms of the gaudy commodore are rare, but display a wide range of mixtures of the wing patterns of both forms.
The northern subspecies (Precis octavia octavia) has only one form which is red with black markings.
The southern subspecies of these butterflies (Precis octavia sesamus) is found from the border region of the Eastern and Western Cape in South Africa and along the eastern side of South Africa, to Swaziland, Mozambique, Tanzania and Kenya.
The eggs are tiny, rounded, green domes with ribs running up the sides.
The larvae are variable; orange, or orange with black bands, or almost completely black. The final-instar larvae are black when reared at the lower temperatures associated with the winter form, and bright orange when reared at the slightly higher summer temperatures.
The pupae hang upside-down and have a knobbley appearance.
By keeping the pupae at different temperatures (warmer or cooler), the two forms of the adults can be produced, while maintaining pupae at ‘boundary’ temperatures produces transitional forms.
The adults feed on nectar and have an all year flight period, with the winter form found from March to September and the summer form found from October to March.
The two forms are not only different in appearance, but also display different behavior:
The males of the summer form display conspicuous hilltopping, and show both territorial and perching behaviour. They fly between one and two meters off the ground with a medium-fast “flap-flap-glide” motion. They are often found in grasslands.
The male winter form rarely hilltops, has a random flight pattern, and is often found near forests. In cold weather, the winter form hibernates in holes or under overhanging rocks. Up to 35 individuals may gather together in these places.
- Precis octavia octavia (eastern Senegal, Guinea, Burkina Faso, Sierra Leone, Liberia, Ghana, Togo, Benin, Nigeria, Cameroon, Gabon, Congo, Central African Republic, Sudan, Ethiopia, Somalia, northern and central Democratic Republic of Congo)
- Precis octavia sesamus Trimen, 1883 (Uganda, Angola, southern and eastern Democratic Republic of Congo, Kenya to Zambia, Mozambique, Zimbabwe, Botswana, northern Namibia, South Africa, Swaziland)
- "Precis octavia". Natural History Museum. Retrieved June 26, 2010.
- M. Williams (1994). Butterflies of Southern Africa; A Field Guide. Southern Book Publishers. ISBN 1-86812-516-5.
- Biodiversity data provided by: Data contributors to the Southern African Butterfly Conservation Assessment (SABCA) (list of contributors accessible here: http://sabca.adu.org.za/thanks.php), a joint project of the South African National Biodiversity Institute, the Animal Demography Unit, University of Cape Town, and the Lepidopterists' Society of Africa (accessed via SABCA’s online virtual museum, http://sabca.adu.org.za/vm_redirect.php, June 24, 2010)
- S. Woodhall (2008). What's that Butterfly?. Cape Town: Struik Publishers. ISBN 978-1-77007-486-6.
- "Afrotropical Butterflies". Retrieved June 26, 2010.
- Williams, M. (1994). Butterflies of Southern Africa; A Field Guide. Southern Book Publishers. ISBN 1-86812-516-5.
- Pennington, K.
- Woodhall, S. (2010)
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