Orders: Araneae (The Spiders) & Opolines (The Harvestmen)
There are nearly 700 species of spider (Araneae) in Great Britain and as we all know they have 4 pairs of legs instead of the 3 pairs found on insects. Other differences include a body comprising of two parts and the lack of metamorphosis. The young appear as whole, if smaller, versions of the adults straight from the egg. There is no larval stage from which a metamorphosis process is required. Spiders simply grow and mature sexually. Opoliones or Harvestmen, of which there are around 30 species in the UK, have a body made of one single part, as though the head and abdomen have been merged.
Orders: Oribatida, Mesostigmata, Trombidiformes – The Mites
With the possible exception of the Red Velvet Mite, which can be seen frequently roaming vegetation and other surfaces seeking out a meal, most mites go about their lives unseen. Scavaging the gardens detritus, predating on other invertebrates, including other species of mite (as Statiolaelaps scimitus does), as well as feeding on fungi and other vegetation.