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Gulf Fritillary caterpillar, Florida, January 2021. In appearance, the larvae are dark orange with small black spines protruding outward from the body. The larval stages of gulf fritillaries include five instars, each with a varying timeframe. After the eggs hatch, the new larvae eat the egg casings for food.
The spiny caterpillars are striking in appearance, with black bodies and a line of eight reddish-orange dots running down the back (aposematic, warning coloration). The prolegs are dark red. The body is covered with short hairs and black spines and white dots. [2] The fully grown mourning cloak caterpillars attain two inches in length. [3]
The upperside of the wings is checkered with orange and black. Both the forewing and hindwing have a row of submarginal black spots and black median lines running across the wings. [3] [4] The underside of the forewing is orange with a pale orange spot rimmed in black in the forewing cell. The underside of the hindwing is mottled with browns ...
It has a pair of osmeterium and black spines on each thoracic segment, the third pair being orange yellow. A fourth pair is situated on the last segment. The spines are usually black with orange rings at the base of each spine. The caterpillars undergo five instars over a period of 15–16 days, during which many are attacked by parasitoid wasps.
The silver-washed fritillary butterfly is deep orange with black spots on the upperside of its wings. It has a wingspan of 54–70 mm, with the male's being smaller and paler than the female's. The underside is green with a metallic gloss and broad silver bands which are partly curved, hence the name silver-washed. In the male the forewings are ...
These spines are usually orange along the skirt of the caterpillar and orange or black along the tentacles present at both ends of the body. The larvae will use this defensively by curling outwards so that their spines are unavoidable to a predator. [6] The spines are also used in the silk cocoon to further protect it during metamorphosis. [3]
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Colias eurytheme, the orange sulphur, also known as the alfalfa butterfly and in its larval stage as the alfalfa caterpillar, is a butterfly of the family Pieridae, where it belongs to the lowland group of "clouded yellows and sulphurs" subfamily Coliadinae. It is found throughout North America from southern Canada to Mexico.