Description


A diary of my mothing activity covering highlights and photos from my moth trapping activities. Mainly Norfolk (UK), occasionally beyond. I may mention other wildlife sightings here, especially insects, but for birds see my birding diary.

Wednesday, 17 February 2021

Review of 2019 and 2020 - Moths: Slenders and Midgets (Gracillariidae) (part 1: Caloptilia and Gracillaria)

SLENDERS and MIDGETS (GRACILLARIIDAE)


Clouded Slender Caloptilia populetorum - One caught in my garden on 10th August 2020 was only my second ever following one here in 2018.  This is possibly also the ID of a leaf-roll in Downy Birch at the meadows in 2019.  Comments welcome, but it sounds like these can't be done positively without rearing them through.

female Clouded Slender Caloptilia populetorum, North Elmham, 10th August 2019


possible Clouded Slender Caloptilia populetorum (??) leaf-mine, North Elmham Cathedral Meadows, 10th May 2019



Pale Red Slender Caloptilia elongella - None.  I've caught this species at home twice, in 2016 and 2018.


Red Birch Slender Caloptilia betulicola - None.  I've not found this species any closer than Alderford Common and Marsham Heath but it's widespread enough so I must have a fair chance of finding it here.


Small Red Slender Caloptilia rufipennella - Singles in the garden moth trap on 23rd and 25th July 2019, doubling the number of this species I've recorded here (singles in 2016 and 2018).  None in 2020.

Small Red Slender Caloptilia rufipennella, North Elmham, 25th July 2019



Yellow-triangle Slender Caloptilia alchimiella - A male in my moth trap on 17th August 2019 and an unprecedented 5 caught here between 8th and 20th August 2020.  My previous best annual tally was 3 and I didn't catch any in 2018.  Also one at Bintree Wood on 26th June 2020.

male Yellow-triangle Slender Caloptilia alchimiella, North Elmham, 17th August 2019


female Yellow-triangle Slender Caloptilia alchimiella, North Elmham, 10th August 2020



New Oak Slender Caloptilia robustella - Singles in my garden trap on 24th July and 27th August 2019 and 4 between 31st July and 16th August 2020.  Also one at Swanton Great Wood in August 2019 and one at the meadows on 17th May 2020.  I've recorded this species every full year I've lived here with an average of over 3 per year.

male New Oak Slender Caloptilia robustella, North Elmham, 24th July 2019


male New Oak Slender Caloptilia robustella, Swanton Great Wood, 27th August 2019


male New Oak Slender Caloptilia robustella, North Elmham Cathedral Meadows, 17th May 2020


male New Oak Slender Caloptilia robustella, North Elmham, 31st  July 2020



White-triangle Slender Caloptilia stigmatella - One caught in my garden moth trap on 11th August 2020, my 5th here in 6 years.  Also one at Weybourne no 5th July 2019.

female White-triangle Slender Caloptilia stigmatella, North Elmham, 11th August 2020


Scarce Alder Slender Caloptilia falconipennella - One caught in my garden moth trap on 3rd April 2020.  I'd had them here previously in 2017 and 2018.

male Scarce Alder Slender Caloptilia falconipennella, North Elmham, 3rd April 2020



Maple Slender Caloptilia semifascia - 3 in my garden trap between 21st and 25th July 2019, one on 3rd April 2020 and 5 between 30th July and 15th August 2020.  Following singles here in 2014, 2016 and 2017 I had 4 in 2018, suggesting this species is becoming commoner.  Also one at the meadows on 13th July 2020.  The first 5 of this species that I caught (between 2014 and April 2018) were of the autumn/spring hibernating generation that shows a white angled streak on the forewing but 12 of the last 13 I've seen (2018-2020) were of the summer generation that shows a whitish costal blotch, so it seems like it's just the summer generation that is increasing.

Maple Slender Caloptilia semifascia, North Elmham, 21st July 2019


Maple Slender Caloptilia semifascia, North Elmham, 30th July 2020



Common Slender Gracillaria syringella - Singles in my garden trap on 25th May and 23rd June 2019 but none in 2020.  I'd only caught one of these here before (in 2017) although I've seen a few elsewhere.

Common Slender Gracillaria syringella, North Elmham, 25th May 2019


Next page: more Gracillariidae





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