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Slug or caterpillar

Slug or caterpillar
Lakeland, Polk County, Florida, USA
February 21, 2013
Size: .5 cm
Pruning plants in the butterfly garden this morning and found this on a milkweed, asclepias, plant. I have so many different butterfly plants in the garden, too numerous to name all. I was not sure if this is a slug of some sort or the larva of a butterfly I haven't raised yet. This was less than 1cm, when I tried to measure it on the leaf. I used my extension tubes with the camera to photograph. The dark 'slits' on its back in the white area pulsate/open and close very slightly as if beating or breathing? I have it in a butterfly enclosure for now to raise/see how it grows.

Images of this individual: tag all
Slug or caterpillar Slug or caterpillar

Not an ID but
There are some similar BG images under Ocyptamus fuscipennis

Moved from ID Request.

Moved from ID Request.

Hover fly larva (Syrphidae)
To raise it, you would need to feed it aphids or something similar.

hover fly
cool..I have seen the adults flying around the plants before. Are they harmful to caterpillars or butterflies? I have plenty of aphids..they flock to the asclepias plants.

They specialize in eating aphids as far as I know
so I don't think they really interact with caterpillars/butterflies. It would be great if you can raise it--there is a lot of variety in hover fly larvae, and we don't have many of them linked to adults. See here.

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