Amblyocarenum walckenaeri

trapdoor spiders – Amblyocarenum walckenaeri and Ummidia aedificatoria

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 aedificatoria) 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)

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 and an example of their hunting technique can be seen in the below video of a captive trapdoor spider. (Amblyocarenum walckenaeri)


Ummidia aedificatoria

To confuse us a bit more there is another very similar trap door spider called Ummidia aedificatoria seen in the below image. On closer inspection the adomen 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.

Ummidia aedificatoria
Ummidia aedificatoria

It seems that the geographical range of Ummidia aedificatoria is also restricted to the Andalucian coastline and was once thought to have been accidentally introduced from the Americas. However, some recent studies have found 3 other Mediterranean species casting doubt on this theory.

Ummidia aedificatoria - Notice the white markings at the segments
Ummidia aedificatoria – Notice the white/grey markings at the segments close to the body.

Oh and if you are in the South of Portugal then you might also find another similar species Ummidia algarve. 🙂

Oh and then there is the smaller Iberesia machadoi plus in 2019 a new Iberian trapdoor spider, Iberesia valdemoriana and the first records of I. brauni and I. barbara in the Iberian Peninsula were published.

Iberesia machadoi or similar
Iberesia machadoi or similar

List of trap door spider species In Iberia (Including islands)

The spider family Nemesiidae ( funnel-web trapdoor spiders) contains quite a few species. This is the accepted list for the Iberian Peninsula (Including the islands).

Amblyocarenum
  • Amblyocarenum walckenaeri
Iberesia
  • Iberesia arturica
  • Iberesia barbara
  • Iberesia brauni
  • Iberesia castillana
  • Iberesia machadoi
  • Iberesia valdemoriana
Nemesia
  • Nemesia angustata
  • Nemesia athiasi
  • Nemesia bacelarae
  • Nemesia bacelarae
  • Nemesia berlandi
  • Nemesia bristowei (Majorca)
  • Nemesia crassimana
  • Nemesia dorthesi
  • Nemesia dubia
  • Nemesia hispanica
  • Nemesia ibiza (Ibiza)
  • Nemesia macrocephala occidentalis
  • Nemesia randa (Majorca)
  • Nemesia raripila
  • Nemesia santeugenia (Majorca)
  • Nemesia santeulalia (Ibiza)
  • Nemesia seldeni (Majorca)
  • Nemesia simoni
  • Nemesia uncinata
  • Nemesia ungoliant
  • Nemesia valenciae
Also present but in the family of Halonoproctidae (burrowing or trap door spiders)
Ummidia
  • Ummidia aedificatoria
  • Ummidia algarve
  • Ummidia picea

Any spider experts reading this are most welcome to help out on this article with some more specific information and images! 🙂 Comments are open and very welcome!

See information about the similar Andalucian funnel web spider here.


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