Like the insects, Sminthurus viridis has 6 legs. But as with all springtails it is wingless, has simple eyes and 2 characteristics that distinguish it from insects:
Sminthurus viridis is relatively large by springtail standards, and adults can be up to 3mm in length.
It is a member of the Sminthuridae family - the globular springtails, which have bodies shaped like 2 spheres stuck together.
S. viridis has several distinguishing characteristics:
The springtails were thought to be in a sister class to the insects - the Entognatha. However, some recent DNA studies have elevated them to a separate class - the Collembola. Other studies have placed them in a group closer to the crustaceans - the Pancrustacea, which have similarities to both the Insecta and Crustacea. There is much debate as to the evolutionary origin of the springtails.