Chironomus plumosus
This was identified using Langton & Pinder. It was the first time I've used this key so I had some new terminology to learn, but once that was understood it keyed reasonably straightforwardly. The leg ratio was marginal (1.2) and it took me a couple of attempts to get the beard ratio correctly. The wing length was 6.6mm.
, Dillington Carr, 18-Mar-24 (A) (1).jpg)
, Dillington Carr, 18-Mar-24 (A) (2).jpg)
, Dillington Carr, 18-Mar-24 (A) (21).jpg)
, Dillington Carr, 18-Mar-24 (A) (5).jpg)
, Dillington Carr, 18-Mar-24 (A) (6).jpg)
, Dillington Carr, 18-Mar-24 (A) (8).jpg)
, Dillington Carr, 18-Mar-24 (A) (9).jpg)
, Dillington Carr, 18-Mar-24 (A) (12).jpg)
, Dillington Carr, 18-Mar-24 (A) (15).jpg)
, Dillington Carr, 18-Mar-24 (A) (18).jpg)
, Dillington Carr, 18-Mar-24 (A) (19).jpg)
male Chironomus plumosus showing wing, eye extension, hind tibial combs, pulvilli, side of thorax, antipronotal lobes, hypopygium (ventral view showing inferior volsella and dorsal view showing anal point and superior volsella) and fore tarsomere 1, Wendling Beck Environment Project (Norfolk, UK), 18th March 2024
This was identified the same way, though this time I only checked the ratios visually without measuring them.
, Dillington Carr, 21-Mar-24 (A) (1).jpg)
, Dillington Carr, 21-Mar-24 (A) (2).jpg)
male Chironomus plumosus showing hypopygium (dorsal view), Wendling Beck Environment Project (Norfolk, UK), 21st March 2024