11mm gravid female Mediterranean Recluse Spider (Loxosceles rufescens) found under a large rock on wasteland by Paphos Beach on 15th May 2019.
Mediterranean Recluse Spider / Violin Spider (Loxosceles rufescens)
This is a small and inconspicuous spider I found under a large rock in Paphos very near to our beachfront hotel. At the time I had no idea that it was a spider of any significance yet alone a Mediterranean Recluse Spider. Males have a body-length of up to 7-8mm and females usually 7-10mm, but sometimes up to 12mm. This species is fairly uncommon in Cyprus and they are rarely encountered by humans unless they enter houses. The bite of this spider can be dangerous and there have on rare occasions been human fatalities recorded. Loxosceles contains 134 spider species and spiders of this genus are the only known spiders with necrotic venom.
The Mediterranean Recluse Spider is originally, as the name suggests, from the Mediterranean, however it can now be found across much of Europe, Asia and America. This spider is sometimes referred to as the Violin Spider, or Fiddleback Spider, due to the brown violin-shaped markings usually present on the carapace.
This species builds a small loose web hidden under rocks or logs, under loose low level tree bark or in wall crevices or basements of heated old houses, where the spider remains hidden away during the daytime. At night these nocturnal wandering hunters may leave their hideaway and hunt for other invertebrates found close to their web.
The Mediterranean Recluse Spider is identical in appearance to the notorious Brown Recluse Spider (Loxosceles reclusa) and they can only be separated by very close examination of the reproductive organs, which may sometimes require dissection. The venom of both species is very similar. In Cyprus the Mediterranean Recluse Spider can be found across the island, and this can include coastal regions. I have personally found several Loxosceles rufescens within 50m of the sea. In the USA Loxosceles reclusa is never found near the coast.
There are other slightly similar looking, but harmless, species of spider in Cyprus that can sometimes be mistaken for Recluse Spiders.
Identifying a Recluse Spider
There is often, but not always, a slightly darker violin-shaped marking present on the carapace. The legs of the Recluse Spider are uniform in colour with fine hairs, but no leg spines, and the L2 legs are slightly longer than the other legs. The legs have no stripes or banding. The abdomen is uniform in colour, often with a slightly darker cardiac mark, which can sometimes extend as a thin central line that usually runs partially, or occasionally almost completely, from the front to the rear of the abdomen. The abdominal central line is most often visible on the stretched abdomen of a gravid or well fed specimen, and where visible the central line usually fades and tapers towards the rear of the abdomen. The typical violin shape on the prosoma is usually darker in colour than the prosoma, and is made up of seven rows of hairs. The Recluse Spider has six eyes. These eyes are situated in a single row, in three pairs, and positioned in such a way that they can resemble two eyes and a nose, similar format to Spitting Spiders (Scytodes sp.). This eye-arrangement is one of the most reliable features when trying to identify a Recluse Spider.
Venomous Bite
In 90% of cases bites to humans require little more than basic first aid though: rest, ice, compression and elevation, for the wound to heal completely. Bites are initially trivial and relatively painless but they can progress to local pain, erythema, discolouration, blistering, ulceration and sometimes necrosis and even acute renal failure. Typically a red itchy rash is visible within 24-48 hours after the bite. In less than 10% of bites classic "bullseye" lesions can then start to occur at the site of the bite, becoming necrotic after 7-14 days and leaving a depressed ulcer. These lesions may take many months to heal and can leave permanent scars to the body tissue. Thankfully the Mediterranean Recluse Spider is not an aggressive species and is usually very reluctant to bite humans, so bites are very rare. In about 1% of cases a systemic reaction can occur, following a bite to humans, which can prove dangerous without medical treatment.
It needs to be stressed though that the Mediterranean Recluse is a very shy species, that not only avoids confrontation with humans, but is also very reluctant to bite even when provoked to do so. In January 2022 results were published of ongoing studies on the Mediterranean Recluse, at the University of South Florida Research Lab 108, by Lou Coticchio. These studies revealed the following results when Mediterranean Recluse specimens were encouraged to bite humans by provocation:
Poking the face: 1.5%
Grabbing the legs: 2.5%
Full-body press while prone (right-side up): 4%
Squeezing of the sides: 22.5%
Full-body press while supine (upside down): 36%
Total bite percentage of all threats & all bites together: 7.4%
These results of defensive bites were lower for the Mediterranean Recluse than for any other species of spider it was compared to during the tests.
LINKIncredible videos from these studies can be seen
here and
here, where Mediterranean Recluse spiders refuse to bite a human despite extreme provocation.
There are several antivenins produced to combat the effects of this spider including Aracmyn, Suero Antiloxoscelico, Soro Antiarachidico. However these antivenins are not generally available in Europe or the USA and are only available in Mexico and South American countries, such as Brazil, where Loxosceles spiders, and bites to humans, are more common.
The most dangerous of the Recluse Spiders is the Chilean Recluse Spider, also known as the South American Violin Spider,
Loxosceles laeta. The Chilean Recluse Spider is found in several South American Countries and its bite is so dangerous that human fatalities in Peru could be as high as 19% of bite victims over 13 years old and 50% of children under that age.
LINK. After an image of a Chilean Recluse Spider was posted on Facebook one resident of Chile replied claiming that this species can be found in every home there. Where they are found in homes this spider is killed by the people of Chile.
LINKThere were many great facts and some very interesting information in Travis's video. There was a house in Kanas, in the USA, that was overrun with Brown Recluse Spiders. In a six month period, using both sticky traps and manual capturing, a huge 2055 Brown Recluse spiders were captured from the house. The family that owned the house had lived there for 6 years and not a single one of them had ever been bitten by one of these spiders, despite how incredibly numerous they were. (see 25:24 on video).