Last year I found a larva of Mirificarma lentiginosella on greenweed on a chance visit to Cosmeston Lakes CP (see blog post here). I followed this up with a survey for Butterfly Conservation at Lavernock Point Nature Reserve last week, and was delighted to find not only quite a few M. lentiginosella larvae, but also four larvae of the rarer Agonopterix atomella. The latter species was only known from around 10 UK sites, with no Welsh records since the 1970s (those were in Gwent, where I failed to find it on surveys in 2014-2015).
|Agonopterix atomella larva|
|Greenweed plants where Agonopterix atomella found|
|Mirificarma lentiginosella larva|
So we now know of two Welsh sites for these scarce moths, both in Glamorgan and separated by only a mile or two. The moths might be out there somewhere else, but there aren't many sites with good stands of the foodplant.