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Tag Archives: Epistrophe grossulariae larva

Hoverfly larvae

26 Thursday Oct 2023

Posted by sconzani in insects

≈ Comments Off on Hoverfly larvae

Tags

British hoverflies, Dasysyrphus species, Dasysyrphus species larva, Epistrophe grossulariae larva, hoverfly, hoverfly larvae, Syrphus species, Syrphus species larvae

It’s that time of year when, especially after rain, hoverfly larvae can be found washed off their leaves on to fence posts, railings and stones (e.g. gravestones), particularly under Sycamore trees. Twice in the past week I’ve checked the roadside railings of a local park and found several larvae each time, of three different species.

First, a little cannibalism. The first shot shows a Dasysyrphus species larva that has almost finished eating a larva of one of the Syrphus species of hoverfly. When I returned this way a couple of hours later, the Dasysyrphus sp. larva hadn’t moved far (image on the right) and almost looked like it was considering the snail as prey but I think that would be biting off more than it could chew!

This is just the second Epistrophe grossulariae I’ve seen so I was very pleased to spot it. If you’re wondering what it will grow in to, click this link.

Syrphus species larvae were the most abundant (as with many of these larvae, it’s almost impossible to identify them accurately unless they’re retained and breed through to adulthood). And, as a final treat (?), here’s a little video of one of those Syrphus larvae munching on an aphid (slightly gross but compelling viewing!).

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Doomed

16 Tuesday Nov 2021

Posted by sconzani in insects

≈ 6 Comments

Tags

British hoverflies, Epistrophe grossulariae larva, hoverfly larva, parasitic wasp, wasp parasitising hoverfly larva

During Sunday morning’s meander around Cosmeston, I watched this little drama play out on a fence post: the larva of one of the Syrphus* species of hoverfly was being injected with eggs by a parasitic wasp. The poor larva was bucking about, desperately trying to get rid of the intruder, but to no avail. The wasp’s ovipositor was firmly wedged into the hoverfly larva, pumping eggs into its body. The larva will be eaten from the inside by the wasp’s larvae when they hatch.

211116 syrphus larva (1)
211116 syrphus larva (2)

*My ID was wrong. When I recorded this find, I got the following message from national recorder Geoffrey Wilkinson: ‘This is a small 3rd-stage Epistrophe grossulariae – the rear breathing tube is longer than broad and is two-toned in colour (brown tipped, clear base). Although the colour pattern has yet to fully develop you can just see the fish-bone pattern of green and make out the black dorsal dashes.’

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About me

sconzani

sconzani

I'm a writer and photographer; researcher and blogger; birder and nature lover; countryside rambler and city strider; volunteer and biodiversity recorder.

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