Italian Alder aphid

Tags

British hoverflies, British insects, British leafhoppers, Cicadella viridis, Helophilus trivittatus, hoverfly larva, Italian Alder aphid, leafhopper

These are some of the highlights of my year in insects:

201230 hoverfly larva

I found my First hoverfly larva (and I’ve since found another, though not been able to identify either) …

201230 helophilus trivittatus

… and my first examples of the hoverfly species Helophilus trivittatus.

201230 Crypturaphis grassii

And, very recently, my first Italian Alder aphids, which I’ve since found on another Italian Alder tree on the other side of town.

201230 cicadella viridis

Here’s one I haven’t blogged – it’s a leafhopper, Cicadella viridis, which I saw for the first time during one of the two times this year that I actually caught a train to venture out of my local walking area (this was immediately after our first lockdown ended, when I dared to make two local train journeys – not been on a train or bus since).

Tags

aphids, Crypturaphis grassii, Italian Alder, Italian Alder aphid

At first I thought this incredibly tiny creature was the early instar of a shield bug but, when I couldn’t find any pictures that resembled it on the British Bugs website, I turned to Twitter for help. Luckily, a botanist I know, Karen, had seen something similar posted recently in a Facebook group and very quickly supplied me with a name, Crypturaphis grassii, the Italian Alder aphid, so named because it’s only ever found on Italian Alder trees (Alnus cordata).

201210 Crypturaphis grassii (1)

I found online a report published in 2011, on the first records of this species in Cornwall, which provides some interesting detail about these aphids. Apparently, Crypturaphis grassii is ‘native to southern Italy and Corsica and [was] first recorded in the UK in 1998’. Intrigued, I returned to the tree I’d found my first specimen on and found many more of these creatures, with variations in colour and markings. The report explains that:

Viviparous individuals [those able to birth live young] are yellowish-green to yellowish-brown, with brown spots extending along the dorsal surface, around the edge of the abdomen and on the head. Compound eyes are reddish in colour. … Immature apterae [wingless individuals] are similar but smaller, paler and lacking in dark spots, more translucent and slightly more elongate in shape. Oviparous apterae [wingless individuals that are able to lay eggs] are similar in size and shape to viviparous apterae but are brown in colour, with transverse darker abdominal stripes, rather than spots.

201210 Crypturaphis grassii (3)

The Italian Alder, on which the aphid feeds, was ‘commonly planted as a roadside, waterside and/or windbreak species’ during the 1980s, and, by 2011 when the report was published, the aphids had already spread widely throughout Britain, including having established colonies in the Vale of Glamorgan, which is where I found the aphids in my photographs.