Wednesday, 27 March 2024

Twenty Thousand Leagues Under the Duckweed

This season I planned to work out an aquatic macro photography setup to take more naturalistic habitus photos of aquatic bugs. My first two efforts crashed and burned, or to be more accurate, leaked. The third attempt is functional but not perfect. The setup consists, simply, of a small transparent food storage box:


My first trial was with a Large Red Damselfly nymph, Pyrrhosoma nymphula, which I fished out of one of my ponds as a test subject. It behaved nicely and I got some reasonable photos, although the quality is not outstanding:

Large Red Damselfly nymph

I then moved on to the bugs I planned to photograph, which is where things fell apart. I did get a photo of the rear end of Notonecta viridis, but this shows up the defects in the setup: 

Notonecta viridis

Because the subject is close to (touching) the front of the tank, you can see the distortion from the plastic walls in this macro shot, even though the box looks quite clear when I hold it up to the light. This also results in loss of image quality from subjects in the middle of the tank, even though I am not focussed on the front. But then it got worse. I ran into a major problem trying to photograph Corixids. I discovered that  Corixids will only pause having rammed themselves into plants or gaps, making it impossible to get clear shots. In a bare container, they just continue to swim manically. So it's back to the old setup, simply photographing Corixids from above in a shallow white ceramic dish of water:

Corixa panzeri

I'll hang on to my cheap plastic setup which will get used occasionally for co-operative subjects. 

 

 

Sunday, 10 March 2024

The Return of Megalegs

 

Megalepthyphantes sp. near collinus

On 26th January 2022 I was refurbishing a pond in my Leicester garden when I found a single female spider which, after investigation, turned out to be Megalepthyphantes sp. near collinus. Quite a mouthful that (because it still lacks a formal description and naming), so Megalegs for short. This record was a big range expansion for this new spider. And ... that was it. I have not found any more specimens, and neither has anyone else in VC55. Until, that is, Saturday 9th March 2024, when, opening my dustbin I found another female on the inside of the lid. To find one spider may be regarded as fortunate; to find two looks like there is a colony in my garden. The bin was crammed with hedge prunings from the previous day, which is where the spider must have come from. I look forward to future sightings. 

Megalepthyphantes sp. near collinus epigyne