Some trapdoor spiders in Spain (Araña trampera) are often mistaken for the Andalucian funnel web spider.
Firstly though, the wafer trapdoor spider – Amblyocarenum walckenaeri (and the similar Ummidia picea) can be easily differentiated from the Andalucian funnel web spider by the lack of spinerets (or very short spinerets) and a rather rounded and brownish abdomen. (see above image)
UPDATE April 2022. There is some controversy surrounding the presence or not of Ummidia aedificatoria here in Spain as many believe all have been miss identified and really are Ummidia picea. (See below).
The taxonomy of this spider can be a bit confusing though it seems that the correct scientific name is Amblyocarenum walckenaeri (Lucas, 1846), it is also known as Cyrtauchenius walckenaeri so a search for either name will result in images of this Iberian endemic spider. It seems that few studies have been made on this, or other, close species and it is logical to assume there eventually will be more species and subspecies discovered in the future.
If disturbed trapdoor spiders, understandably, can be quite defensive putting themselves in an attack position with front legs raised but despite this, they are harmless to humans.
They feed on crickets, grasshoppers and other insects that they capture from their cover of their nest.
However, over at the famous bidiversidad virtual many people are defending that very often U picea can sometimes be U aedificatoria especially in southern coastal regions of Spain: (https://www.biodiversidadvirtual.org/insectarium/Ummidia-picea-img182963.html) These identifications have not been verified and it is probable that they are wrong.
On closer inspection the adomen of U picea is almost always a light brown and white or pale marks show at the leg segments. There also may be 4 yellowish dots on the underside of the abdomen.
