The Balearic Islands are on edge following a spate of spider bites in one of Spain’s most popular tourist destinations. While most cases remain mild, several severe incidents have raised concerns.
The species, known as the Mediterranean recluse – or violin – spider (Loxosceles rufescens), is found in many parts of the world and is considered one of the most invasive spiders globally. It thrives in warm, humid environments and has adapted well to living in human dwellings.
Relatively small at around 7 to 7.5 millimetres, the species is identifiable by a violin-shaped marking on the front of its body and its six eyes arranged in pairs (rather than the eight typical of most spiders). Its flattened, velvety body enables it to squeeze into narrow spaces, such as caves, crevices, coastal rock formations, but also wall cracks, furniture, and even between the pages of old books. Nocturnal by nature, it remains largely unseen during the day.
The spiders feed primarily on cockroaches and silverfish, which are commonly found in damp or poorly ventilated buildings. The presence of these insects makes a home more attractive to spiders; conversely, eliminating them significantly reduces the likelihood of spiders settling indoors.
In rare cases, a spider bite can cause serious tissue damage due to enzymes in its venom. Symptoms may appear two to eight hours after the bite and often start with a sharp or burning pain, followed by redness and swelling. Sometimes, a blister may form and turn deep blue or black as the surrounding tissue begins to die. In severe cases, the venom can damage blood cells and interfere with clotting, which can affect internal organs. Such complications are uncommon, but they require immediate medical attention.
In 2024, Italy reported two deaths linked to Loxosceles rufescens: a 52-year-old man and a 23-year-old who died a month after being bitten.
Recluse (Mediterranean) Spider bite
— Roberto Cosentini (@rob_cosentini) August 23, 2024
1/3
Suspect when:
🌍 Europe/south central US
📅 Apr-Oct
🏠 At home
🌙 At night
Phase 1
🔴 Itchy erythema (~ mosquito) 🦟
🕷️Tingling + hypoesthesia ➡️ Envenoming
✅ Spontaneous Resolution within 48hs pic.twitter.com/khyupKOQHC
Several alarming cases have also been documented in the Balearics. The most recent case involved a 60-year-old woman in Menorca who was bitten while putting on her jumper. Although she initially dismissed the sting as minor, she was forced to seek medical help after experiencing two days of intense pain that prevented her from sleeping.
In Ibiza in 2024, a 32-year-old woman nearly lost her leg due to tissue necrosis, and a 19-year-old Welsh tourist reportedly lost two fingers following a bite.
“These bites can happen anywhere,” spider biologist Guillem Pons told the Majorca Daily Bulletin. “In Ibiza, there was a case in a car, while a Catalan tourist walking in flip-flops in Cabrera was stung on the side of his foot. I even have a documented case that occurred in a bathroom at the University of the Balearics.”
What to do if bitten by a Mediterranean Recluse Spider?
If the bite occurred at home, be aware that the spider has probably been living there rent-free for some time and may have even started a family. Each egg sac contains around 40 eggs, which hatch within a few weeks, so infestations can develop unnoticed. Effective ways to get rid of the spiders include chemical treatments, targeted insecticides, or fumigation, while sealing cracks and reducing clutter lowers the likelihood of spiders settling indoors.
However, it is recommended to seek medical attention promptly, whether or not the bite occurred in your house. If possible, take a photo of the spider and show it to medical staff or the nearest poison control centre.
“The treatment is simple,” stresses Pons, “but prompt attention is essential to avoid complications.”
