Lycaenidae: Polyommatinae

07110 Iolas Blue Iolana iolas, (Ochsenheimer, 1816)

BF -- (ABH61.000)

Struma valley, SW Bulgaria, 9th May 2014. Male.
Struma valley, SW Bulgaria, 9th May 2014. Male.
 Photo © Nick Greatorex-Davies
Struma valley, SW Bulgaria, 9th May 2014. Male.
 Photo © Nick Greatorex-Davies
 2010-2016
 2017
 2018
 2019
Struma valley, SW Bulgaria. 18-05-2018. Male.
Struma valley, SW Bulgaria. 18-05-2018. Male.
 Photo © Nick Greatorex-Davies
Struma valley, SW Bulgaria, 9th May 2014. Male.
Struma valley, SW Bulgaria, 9th May 2014. Male.
 Photo © Nick Greatorex-Davies
W Bulgaria. 15-06-2016. Male puddling with Zephyr Blues.
W Bulgaria. 15-06-2016. Male puddling with Zephyr Blues.
 Photo © Nick Freeman
Struma valley, SW Bulgaria, 9th May 2014.
Struma valley, SW Bulgaria, 9th May 2014.
 Photo © Nick Greatorex-Davies
Struma valley, SW Bulgaria, 9th May 2014. Female on Bladder senna (Colutea arborescens)..
Struma valley, SW Bulgaria, 9th May 2014. Female on Bladder senna (Colutea arborescens)..
 Photo © Nick Greatorex-Davies
Struma valley, SW Bulgaria, 9th May 2014. On Bladder Senna (Colutea arborescens)..
Struma valley, SW Bulgaria, 9th May 2014. On Bladder Senna (Colutea arborescens)..
 Photo © Nick Greatorex-Davies
near Kyustendil, West Bulgaria. 7th July 2013.
near Kyustendil, West Bulgaria. 7th July 2013.
 Photo © Nick Greatorex-Davies
Zemen Gorge, W Bulgaria. 03-07-2017. Male.
Zemen Gorge, W Bulgaria. 03-07-2017. Male.
 Photo © Nick Greatorex-Davies
E. Bulgaria. 30-05-2018. Female on Bladder Senna.
E. Bulgaria. 30-05-2018. Female on Bladder Senna.
 Photo © Nick Greatorex-Davies
E Bulgaria. 30-05-2018. Female on Bladder Senna.
E Bulgaria. 30-05-2018. Female on Bladder Senna.
 Photo © Nick Greatorex-Davies
SW Bulgaria. 06-07-2022. Final instar
SW Bulgaria. 06-07-2022. Final instar
 Photo © Nick Greatorex-Davies
SW Bulgaria. 06-07-2022. Final instar
SW Bulgaria. 06-07-2022. Final instar
 Photo © Nick Greatorex-Davies


General Information

Widespread but very local in Bulgaria, generally associated with it's foodplant, Bladder Senna (Colutea arborescens). However it is the largest of the blues in Europe and is a strong flyer, and may be found away (several kilomtres, Tolman & Lewington 2008), from areas where it's foodplant grows.

It has one main generation flying in May and June, but has a partial 2nd generation in August to September (Tari Haahtela et al 2019). On several occasions we have recorded fresh individuals well into July, suggesting a second generation or perhaps an extended flight period.

Larvae feed inside the "bladders" (seed capsules) of the foodplant and can be found feeding on the seeds.

Overwinters as a pupa.



Regional Information

Recorded in 5 (0.3%) of the 1900 10km squares of Bulgaria.

Last recorded in June 2019

Recorded date range (Adult): 09 May to 09 July