description Rivulet moth Overview
The Rivulet (*Perizoma affinitata*) is a geometrid moth described by James Stephens in 1831 and recorded widely in Britain, where it occurs along woodland margins, hedgerows, and grassy embankments. Adults have a wingspan of about 24-30 millimetres and are mainly recorded from May to July. The caterpillars feed inside the seed capsules of red campion (*Silene dioica*), eating the plant's seeds.
help Rivulet moth FAQ
What is the scientific name of the Rivulet moth?
The Rivulet moth is Perizoma affinitata. James Stephens described the species in 1831.
How large is a Rivulet moth?
Adults usually have a wingspan of about 24 to 30 millimetres. That makes it a small geometrid moth rather than a large night-flying species.
Where can the Rivulet moth be found?
It is widely recorded in Britain, especially around woodland margins, hedgerows, and grassy embankments. Its distribution is tied to habitats where its food plants occur.
What family does the Rivulet moth belong to?
The Rivulet belongs to the geometrid moth family, Geometridae. Many geometrids are known for their delicate wing patterns and looping caterpillar movement.
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