Alder Fly (Sialis)

Alder Fly (Sialis)

Observation - Alder Fly (Sialis). Description: These are fairly common on this site at the moment. Approx 12mm long, excluding antennae. Can it be taken to species from the photo?

These are fairly common on this site at the moment. Approx 12mm long, excluding antennae. Can it be taken to species from the photo?