Showing posts with label Mesembrina meridiana. Show all posts
Showing posts with label Mesembrina meridiana. Show all posts

Wednesday, 6 October 2010

Brief sun

We had an unexpected clear blue sky today (I say 'unexpected' because I pay little heed to weather forecasts due to their consistent inaccuracy) so I took an early trip to see what was around.

The heat had certainly brought out more insects than I had expected to see in October, starting with this Buff Ermine moth caterpillar, which is coincidentally basking on the vacated mine of the micromoth Stigmella aurella on Bramble:

The caterpillar will shortly pupate and then hibernate until summer.

The 'Noon Fly' Mesembrina meridiana is never too numerous, but I saw at least eight on this trip:

The larvae of Mesembrina meridiana live in cow-dung and are predatory on other dung-dwelling larvae, including those of the Scathophaga Dung-Fly below:

Scathophaga are dung feeders as larvae, but are voracious predators as adults, a complete reversal from the Mesembrina which only feeds on nectar as an adult.

It would be good to get a 'full-circle' photo of an adult Scathophaga with a Mesembrina as its prey, although the Mesembrina tends to be a little large for the normal prey-size of the Scathophaga.

Just as I was finishing my little survey, a Speckled Wood butterfly flew over my shoulder and landed behind me:

It's amazing what a little sun will bring out.

Continuing the excellent fungal year, I found these 'Lawyer's Wigs' - Coprinus comatus - on my lawn. These only last for a day or two at most.

The visible, reproductive, parts of fungi are the familiar, short-lived, mushrooms or toadstools, but the actual fungus (the mycelium) lies below the soil or inside some other substrate such as wood or animal debris. This mycelium will last as long as conditions are right, which is why fungi are often found in precisely the same place from year to year. This specimen of Phaeolepiota aurea was also on my lawn, and in exactly the same place as last year. This rare fungus is thought to be a nettle associate (and I have nettles within a few metres of this specimen), but there must also be some other requirement, since the vast majority of nettle patches don't have the fungus.


Monday, 20 July 2009

Playing catch up

In the normal order of things, higher order species tend to prey on lower-order species, so wasps and bees tend to be predators on flies (or members of their own order). The Conopid fly Sicus ferrugineus, however, reverses this trend. These are parasitic on bumblebees, stapling a single egg into the soft underside of the worker's abdomen. This oviposition is said to take place in flight, but I have never seen it happening. Once the bumblebee has been parasitised it tends to change its feeding habits, presumably to the benefit of the fly larva.


Mesembrina meridiana is easily recognisable due to the orange wing base. The name indicates that it is a noon flyer, and that's when I usually see them.


Angelica has flowered and that means plenty of shots of nectaring insects. this is the Tree Wasp - Dolichovespula sylvestris. It has an overall orange feel to the colouration and the antennae bases are yellow. Facial decoration is a single small spot.


This male hoverfly looked unusual, but it consistently keys out to the very common Eristalis pertinax.


Trombidium sp. mites are usually seen scrambling over the base of plants as they search for rotting vegetation. This one was sunning on a grass blade.


Those of you who have been following my websites for a few years will know that this is one of my favourite flowers: Slender St. John's Wort - Hypericum pulchrum. The latin name shows that I'm not alone in that opinion.


This pristine flower of Meadow Buttercup - Ranunculus acris - caught my attention:


Finally for today - Eyebright. That's as far as the id is going.