Map indicating the distribution of Sac spiders, within Southern Africa. These are free living spiders often found in plants and in houses where they build a silk sac under which they hide or lay eggs. They are a cream-white to pale yellow or reddish-brown with distinct black or dark mouth pieces.

The sac spiders of the family Clubionidae[a] are nocturnal, sac-building hunting spiders with a near-worldwide distribution. Their sacs, silken retreats in which they hide during the day, may be made in a variety of places, including between folded leaves or grass blades, under bark and below rocks or other ground litter. [citation needed]

A few recent publications on confirmed Sac Spider bites from Europe, America and Australia have led people to claim Sac Spiders in South Africa are harmless and have since been “declassified” as medically important.

Cheiracanthium, commonly called yellow sac spiders, is a genus of araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. [4] They are usually pale in colour, and have an abdomen that can range from yellow to beige.

2024年8月29日 · South Africa is home to a large number and diversity of spiders, with well over 2 000 species recorded, the vast majority of which are completely harmless to humans. This month we will take a closer look at the sac spiders of the genus Cheiracanthium.

They are free-living spiders that are active at night when they move around in search of prey. They can then easily become entangled in bedding where they might deliver a bite when threatened. During the day they hide in a soft sac-like retreat that can easily be seen in …

2023年7月17日 · 5. Yellow Sac Spiders. Sac spiders are usually found in plants and houses. They get their name from the silk sac they build under which they hide their eggs. They’re either cream-white to pale yellow or even a reddish-brown with a black or dark area around the mouth.

2019年2月5日 · Sac spiders are light brown with a black face and range between 4 and 12mm. It is an aggressive spider but is not implicated in spider envenomations in South Africa. They were blamed for 70-80% of nasty bites but this has been an …

2021年11月18日 · Cheiracanthium spiders in South Africa had been accused, on disputed evidence, of causing the same kind of serious sores of which brown recluses are capable. More: The media got hold of this research, it was repeated many times in both scientific and popular literature without rigorous investigation and a legend was born.

The Long-legged sac spider, Cheiracanthium furculatum, previously known as Cheiracanthium lawrencei, is synanthropic, entering houses, and in South Africa has been implicated in 70-75% of spider bites that cause death of tissue at the site of the bite (necrotic envenomations).