Dictyna arundinacea is a species of spider belonging to the family Dictynidae. It has a holarctic distribution; It is found throughout Britain and northern Europe. The body length excluding legs is about 2 to 3.5 mm, the females being slightly larger than the males. The carapace is dark brown. The head is covered with five rows of white hairs. The abdomen has a pattern of white hairs with a gap in the cardiac region and at the rear. The legs are brownish yellow. D. arundinacea builds webs in the dried heads of plants and on gorse and heather.