S
Species Profile

Six-Eyed Sand Spiders

Sicariidae

Six eyes. Silent ambush.
Dan Olsen/Shutterstock.com
A six-eyed sand spider rests on top of rust-colored sand

At a Glance

Family Overview This page covers the Six-Eyed Sand Spiders family as a group. Stats below are general traits shared across the family.
Also Known As Recluse spider, Fiddleback spider, Violin spider, Sand recluse, Sand spider
Diet Carnivore
Activity Nocturnal+
Lifespan 4 years
Weight 0.005 lbs
Status Not Evaluated
Did You Know?

All Sicariidae have 6 eyes (in three pairs), not 8-one of their key family traits.

Scientific Classification

Family Overview "Six-Eyed Sand Spiders" is not a single species but represents an entire family containing multiple species.

Six-eyed sand spiders are sicariid spiders known for having six eyes (rather than eight) and for their sand-burying, ambush lifestyle. The common name is most strongly associated with the sand-dwelling genera Sicarius (New World) and Hexophthalma (southern Africa).

Kingdom
Animalia
Phylum
Arthropoda
Class
Arachnida
Order
Araneae
Family
Sicariidae

Distinguishing Features

  • Six eyes arranged in three pairs (typical for Sicariidae)
  • Strong sand-camouflage behavior (burying/covering with sand)
  • Ambush predation on small arthropods
  • Flattened body and long legs suited to moving on/under loose sand
  • Notable medical interest due to necrotic/cytotoxic venom in some sicariids (risk varies by species and is often overstated in popular media)

Physical Measurements

Males and females differ in size

Length
0 in (0 in – 1 in)
Weight
0 lbs (0 lbs – 0 lbs)
0 lbs (0 lbs – 0 lbs)
Top Speed
4 mph
running
Venomous

Appearance

Primary Colors
Secondary Colors
Skin Type Hard chitinous exoskeleton with matte, velvety setae; sand-burying genera have dense hairs that trap sand for camouflage. Cuticle color and texture change with habitats like deserts, rocks, leaf litter, caves, and buildings.
Distinctive Features
  • The name six-eyed sand spider refers to several sicariid species, mainly Sicarius in the Americas and Hexophthalma in southern Africa, not the whole Sicariidae family which has other genera.
  • MEASUREMENTS: adults about 0.8-1.5 cm body length; leg span up to about 5 cm (often appearing longer due to a flattened, sand-burying body form and relatively long legs).
  • EYES: six eyes (not eight), arranged in three pairs (dyads), a defining trait across Sicariidae; eye spacing and prominence vary among genera.
  • BODY FORM: many have a low, flattened profile and outward-splayed legs aiding concealment; some taxa are more gracile and adapted to crevices/retreats.
  • CAMOUFLAGE: cryptic coloration and fine mottling are common; sand-burying species actively coat themselves with sand/soil using body hairs.
  • BEHAVIOR/ECOLOGY (general): mostly sit-and-wait predators that remain still for long periods; activity is often nocturnal or crepuscular, though some ambush sites are used by day.
  • BEHAVIOR/ECOLOGY (variation): sand-burying ambush is characteristic of Sicarius/Hexophthalma; other sicariids more often use silk retreats in sheltered sites (under bark, rocks, debris, or buildings) rather than deep sand burial.
  • HABITATS: arid and semi-arid areas are common for sand spiders; across the family, habitats range from deserts and scrublands to temperate interiors, caves, and synanthropic (human-associated) locations in some species.
  • GEOGRAPHY (requested emphasis): sand-burying 'six-eyed sand spiders' split broadly between Hexophthalma (southern Africa) and Sicarius (Americas); overall family distribution is broader due to additional genera.
  • LIFESPAN (family-wide range): typically ~1-6 years depending on species, climate, and sex; females often live longer, and individuals in stable retreats may persist multiple years.
  • DEFENSE/INTERACTIONS: many rely on immobility and camouflage; bites are generally defensive and uncommon, with medically significant effects varying by genus and circumstances.

Sexual Dimorphism

Dimorphism is usually subtle to moderate: females often have larger, rounder abdomens and greater overall mass, while males are typically more slender with proportionally longer legs and enlarged palps. Size differences vary widely among genera and species.

  • More slender body with smaller abdomen in many species
  • Enlarged pedipalps (palpal bulbs) in adults
  • Often proportionally longer legs and a more 'leggy' appearance
  • May wander more during mate-searching, increasing observed mobility
  • Larger, fuller abdomen, especially when gravid
  • Often heavier-bodied overall; can appear broader in sand-burying taxa
  • Typically longer-lived on average in many species
  • May remain more site-faithful to retreats/ambush locations

Did You Know?

All Sicariidae have 6 eyes (in three pairs), not 8-one of their key family traits.

The name "six-eyed sand spider" mainly refers to sand specialists in two genera: Sicarius (Americas) and Hexophthalma (southern Africa).

Many sicariids can go long periods without food or water, aided by low metabolic demands.

Several species are ambush predators; some literally disappear under sand or soil with only a faint outline left behind.

Their venoms are famous in medicine because they can contain sphingomyelinase D-an enzyme associated with tissue damage in some bites.

The family spans very different lifestyles: desert dune ambushers, rocky outcrop dwellers, and human-associated recluses.

Unlike web builders, many sicariids rely more on stealth, camouflage, and sudden bursts of speed than on prey-catching webs.

Unique Adaptations

  • Six-eye arrangement (three pairs) typical of Sicariidae, with reduced eye count compared with many other spiders.
  • Extreme crypsis: body shapes and mottled browns match sand/soil; many species have setae that help hold particles, enhancing camouflage.
  • Sand/soil concealment behavior in sand specialists, enabling ambush predation and protection from heat and predators.
  • Physiological hardiness: notable tolerance of drought and starvation reported in multiple sicariids (degree varies by species).
  • Medically significant venom components in the family (including sphingomyelinase D in several species), evolved for subduing prey; effects on humans vary by species and bite circumstances.
  • Low-profile, ground-oriented body plan suited to crevices, under-rock spaces, and shallow substrates.

Interesting Behaviors

  • Sand-burying ambush (common in Sicarius and Hexophthalma): individuals use legs and body movements to flick sand over themselves, then wait motionless for prey to pass.
  • Nocturnal and reclusive activity patterns are widespread, but intensity varies: some species hunt mostly at night, others also ambush in shaded daytime conditions.
  • Sit-and-wait predation is common; however, some species actively wander short distances between cover patches when conditions are favorable.
  • Retreat use varies across the family: some shelter under stones or in crevices; others use shallow burrows or sand cover; many make minimal silk compared with orb weavers.
  • Reproduction often involves guarded egg sacs and seasonal timing tied to rainfall or temperature; details vary by species and habitat.
  • Synanthropy (living near humans) is prominent in parts of the genus Loxosceles, while many sand spiders remain strictly wild and habitat-specialized.

Cultural Significance

Sicariidae appear in health and natural history. Recluse spiders (Loxosceles) shape health warnings and household spider lore. Six-eyed sand spiders (Sicarius in the Americas; Hexophthalma in southern Africa) are shown in documentaries and museums for desert hiding and ambush hunting. 'Sicarius' means 'assassin' in Latin.

Myths & Legends

Naming origin as cultural story: "Sicarius" comes from Latin for 'assassin' (used for Roman-era dagger-men), a dramatic label later applied to these stealth ambushers by taxonomists.

Naming origin as cultural story: "Hexophthalma" literally means 'six-eyed,' highlighting a striking trait that helped cement the 'six-eyed' common name in popular accounts.

In parts of southern Africa and the Americas, spiders in folk tales warn of hidden danger at home or in the sand. Modern people often blame recluse spiders or sand spiders.

Wider spider folklore sometimes borrowed in education/outreach: trickster spider figures like Anansi (West Africa/Caribbean tradition) are occasionally invoked in talks and exhibits about arachnids, though they are not specifically tied to Sicariidae in traditional myth.

You might be looking for:

Hexophthalma hahni (Namib six-eyed sand spider)

36%

Hexophthalma hahni

Iconic Namib Desert species frequently meant by the singular phrase “six-eyed sand spider.” Formerly placed in Sicarius.

Hexophthalma testacea

17%

Hexophthalma testacea

Southern African six-eyed sand spider species, also historically included under Sicarius in older sources.

Sicarius terrosus

12%

Sicarius terrosus

South American sand-dwelling sicariid often included under the “six-eyed sand spider” common-name umbrella.

Sicarius hahni (older combination)

10%

Sicarius hahni

Legacy name seen in older literature for Hexophthalma hahni.

Recluse spiders (related sicariids)

8%

Loxosceles spp.

Close relatives in Sicariidae; not usually called “sand spiders,” but sometimes conflated due to family relationship and venom notoriety.

Life Cycle

Birth 80 spiderlings
Lifespan 4 years

Lifespan

In the Wild
1–12 years
In Captivity
2–15 years

Reproduction

Mating System Polygynandry
Social Structure Solitary
Breeding Pattern Transient
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Across Sicariidae, adults are largely solitary; males roam to locate females and court briefly. Multiple mating by both sexes is likely common, with encounter-based pairings rather than bonds. Females produce egg sacs and provide little to no post-oviposition care.

Behavior & Ecology

Social Aggregation Group: 1
Activity Nocturnal, Crepuscular, Cathemeral
Diet Carnivore Small, ground-active insects and other arthropods encountered near retreats or ambush sites (often beetles/roaches/crickets, varying by species and habitat).
Seasonal Hibernates

Temperament

Solitary and reclusive; typically cryptic ambush hunters that avoid contact and are not social, but may bite defensively if handled or threatened.
Generally cryptic, sedentary ambush predators; many use sand-burying or tight retreats, with some active wandering.
Typically non-aggressive and bite-averse; defensiveness increases when trapped, handled, or guarding retreats/egg sacs.
Conspecific tolerance varies: many individuals avoid each other, while occasional co-occurrence in suitable desert retreats may occur without cooperation.
Foraging ecology varies by species and habitat (arid sandy deserts and rocky areas), but sit-and-wait ambush predation is widespread.

Communication

None known; communication is primarily non-vocal.
Chemical cues (pheromones) on silk/draglines for mate finding and recognition.
Substrate-borne vibrations (leg tapping/drumming) during courtship and close-range interactions.
Tactile signaling during courtship (leg palpation, contact patterns) and mating.
Silk use for environmental information and possibly occupancy cues in shared refuges.

Habitat

Biomes:
Desert Hot Desert Cold Mediterranean Savanna Tropical Dry Forest Temperate Grassland Wetland +1
Terrain:
Sandy Rocky Plains Plateau Valley Hilly Coastal +1
Elevation: Up to 11482 ft 11 in

Ecological Role

Mesopredators of terrestrial arthropod communities (ground/crevice-associated hunters), influencing local invertebrate abundance and behavior; they also serve as prey for larger arthropod predators and small vertebrates.

Regulation of insect and other arthropod populations (including some pest species, especially in peridomestic settings for Loxosceles) Contribution to food webs as both predators and prey, supporting trophic transfer in desert and terrestrial ecosystems

Diet Details

Main Prey:
Small insects Ground-dwelling insects and small arthropods Ants and termites Orthopterans True bugs and other wandering arthropods Spiders Small arachnids Ground-dwelling arthropods +2

Human Interaction

Domestication Status

Wild

Six-eyed sand spiders (family Sicariidae, including Sicarius and Hexophthalma) are not domesticated and have no documented history of selective breeding or domestication for human use. They may be kept temporarily in captivity for research or education, but this does not constitute domestication.

Danger Level

High
  • Medically significant envenomation potential across the family; clinical severity varies by genus/species, dose, and patient factors
  • Necrotic skin lesions and secondary infection risk reported particularly with recluse spider (Loxosceles) bites; systemic effects are less common but possible
  • Bites are typically defensive and often occur via accidental contact (clothing, bedding, stored items, handling); sand-burrowing species tend to bite humans far less often due to low encounter rates
  • Misidentification is common in public reporting, complicating risk perception and medical decision-making

As a Pet

Not Suitable as Pet

Legality: Laws about keeping Six-eyed sand spiders (Sicariidae) vary. Some places ban or limit possession, sale, or collection of venomous spiders. Experts warn against private keeping; check local rules.

Care Level: Expert Only

Purchase Cost: $20 - $250
Lifetime Cost: $150 - $1,200

Economic Value

Uses:
Public health relevance (medical management and prevention) Biomedical/toxinology research value Ecosystem services (invertebrate predation) Small-scale exotic pet trade (limited, niche)
Products:
  • research reagents/knowledge from venom components (e.g., studies of sphingomyelinase D-associated pathology; not a consumer product)
  • pest suppression benefits via predation on insects/other arthropods (context-dependent)
  • costs associated with bite evaluation, wound care, and public education/mitigation in areas with synanthropic species

Relationships

Related Species 5

Recluse spiders Loxosceles Shared Family
Sand spiders Sicarius Shared Family
Six-eyed sand spiders
Six-eyed sand spiders Hexophthalma Shared Family
Brown recluse Loxosceles reclusa Shared Family
Chilean recluse
Chilean recluse Loxosceles laeta Shared Family

Ecological Equivalents 4

Animals that fill a similar ecological role in their ecosystem

Crab spider
Crab spider Thomisidae Often rely on sit-and-wait ambushes rather than building prey-capture webs; share a "remain motionless, strike quickly" hunting style, even though habitats and camouflage strategies vary widely.
Ground spiders Gnaphosidae Nocturnal, ground-dwelling hunters that hide under cover and ambush or actively hunt on substrates; share cryptic coloration and use burrows or other retreats (though Sicariidae are especially known for sand-burying in some lineages).
Wolf spiders Lycosidae Many species hunt on the ground in arid/open habitats. Some sand-adapted wolf spiders also use shallow burrows and ambush tactics, paralleling the general niche of sand/soil-surface predation.
Trapdoor spiders
Trapdoor spiders Mygalomorphae They use burrow-based ambush predation and heavily rely on concealed retreats, exhibiting a similar 'strike-from-cover' ecology despite distant relatedness and different venom systems.

Types of Six-Eyed Sand Spiders

12

Explore 12 recognized types of six-eyed sand spiders

Six-eyed sand spider Hexophthalma hahni
Six-eyed sand spider Hexophthalma testacea
Sand spider
Sand spider Sicarius terrosus
Sand spider
Sand spider Sicarius patagonicus
Sand spider
Sand spider Sicarius ornatus
Sand spider
Sand spider Sicarius peruensis
Brown recluse Loxosceles reclusa
Chilean recluse Loxosceles laeta
Mediterranean recluse Loxosceles rufescens
Desert recluse Loxosceles deserta
Arizona brown spider Loxosceles arizonica
Brazilian recluse Loxosceles intermedia

The Six-Eyed Sand Spider disguises itself on the desert floor by burying itself in the sand. They will surprise attack prey by leaping from the sand.

Six-Eyed Sand Spider Summary

The six-eyed sand spider is a species of arachnid living in deserts and hot, dry climates throughout Southern Africa. They get their name from the six eyes in three pairs on their head. These spiders are skilled hunters who ambush their prey and use their large, powerful fangs to inject their venom and subdue them. Finding this species would be incredibly difficult as they are masters of camouflage.

6 Incredible Six-Eyed Sand Spider Facts

1. It is a species of spider mainly living in deserts across Africa.

2. The six-eyed sand spider can survive up to 1 year without food or water.

3. It is one of the most venomous spiders in the world, and its bite can be fatal to humans.

4. They do not attack often, and there have only been 2 known cases where humans were bit by a six-eyed sand spider.

5. The spider buries itself in the sand and waits for prey to come within range before attacking.

6. It is also known as a crab spider due to its flattened stance.

Six-Eyed Sand Spider Scientific Name

Sicarius hahni

The scientific name for this spider is Sicarius hahni. The word “sicarius” means “murderer” or “assassin” in Latin. The spider has this name because of its aggressive nature when hunting prey.

Six-Eyed Sand Spider Appearance

Most Dangerous Spiders

Closeup picture of the six-eyed sand spider of the genus Hexophthalma photographed in the Namib desert near Swakopmund.

The six-eyed sand spider has six eyes arranged on its head. These eyes give the spider excellent vision and help it to hunt prey effectively. Its body is medium-sized and broader than other similar spiders. It is brown, yellow, or reddish-brown in color and has short hairs all over. The spider has 8 legs that are long and thin. The ends of the legs have sharp claws for catching prey. The female of the species is about 2 inches across in diameter. Male six-eyed sand spiders are smaller than females, with slimmer bodies and shorter legs.

Six-Eyed Sand Spider Evolution

The six-eyed sand spider has undergone significant evolution to adapt to its environment. For example, its body has become more flattened and elongated, which helps it to move quickly through sand and dunes. Additionally, its legs have evolved to be very long and thin, which also aids in movement through the sand and allows the spider to cover itself with sand or flatten itself completely. This adaptation aids the spider in hiding from predators and camouflaging itself to sneak up on prey. This spider is an excellent example of how organisms can evolve to suit their environment better. Another desert adaptation is its ability to survive without food or water for up to 1 year. The six-eyed sand spider has undergone a great deal of evolution to survive and thrive in its habitat.

Six-Eyed Sand Spider Behavior

The six-eyed sand spiders are native to African deserts and are aggressive and venomous in nature. They are also swift and agile, making them difficult to catch. These spiders typically hunt quickly and aggressively, camouflaged and awaiting their prey while hidden in the sand or environment around them. When they sense their target, they quickly move toward it and attack. They are not aggressive towards humans and rarely bite. However, their venom is powerful enough to kill small mammals and even humans, so it is essential to be careful if you encounter one of these spiders in the wild.

Six-Eyed Sand Spider Habitat

The six-eyed sand spider is in hot, desert regions. Its habitat mainly consists of caves, crevices, and natural debris. They are most common in Southern Africa and live in remote, hot, and dry areas where humans seldom venture. The spider has long legs that move quickly over sand dunes. An abundance of these spiders are in fine sand patches. The spider does not live in a web or a den but instead buries itself in the sand.

Six-Eyed Sand Spider Diet

The six-eyed sand spider is a predatory species that feed on small insects and other arthropods. These spiders are known to be aggressive hunters and will even attack larger prey items if they can subdue them.

In terms of their specific prey, six-eyed sand spiders have been observed eating insects, scorpions, and other small animals. However, it is important to note that they are opportunistic hunters, so the diet of any given individual six-eyed sand spider can vary somewhat depending on the availability of prey items in its environment. For example, if there are few small insects around, a spider may be forced to eat larger prey, such as birds or even small rodents, to survive. Additionally, younger spiders tend to eat more frequently than adult spiders since they have yet to reach their full size.

What Eats the Six-Eyed Sand Spider?

It’s most significant predators are birds, reptiles, and amphibians.

What Does the Six-Eyed Sand Spider Eat?

They typically eats insects and scorpions. However, they can eat other spiders, small birds, or even small mammals.

Six-Eyed Sand Spider Predators and Threats

Considering that it can survive up to a year without food, the biggest threats to these spiders are predators such as birds, reptiles, and amphibians. These are all potential predators. However, with that said, it is reclusive in nature and camouflage make it a very difficult animal to hunt.

Six-Eyed Sand Spider Venom

It is believed to be one of the most venomous spiders in the world. Its venom is highly destructive and causes hemorrhaging, necrosis, blood vessel bursting, intense pain, swelling, and death. Only 2 people have ever been recorded to have been bit by one, so it is incredibly rare to be bit, and research on the venom is very limited.

Six-Eyed Sand Spider Reproduction

The females produce up to 1000 eggs which she then wraps in a web cocoon. Once the eggs hatch, the spiderlings will climb onto their mother’s back and stay there for several weeks until they are old enough to fend for themselves. The male spiders are much smaller than the females and do not live as long. Most spiders perform mating rituals for the male to get close enough to the female without triggering an aggressive response. If all goes correctly and mating is successful, the male must make a fast exit not to be eaten by the female spider. In many cases, the male is killed by the female after mating.

Six-Eyed Sand Spider Babies

While not much is known about six-eyed sand spiders as spiderlings, we know that they may climb onto their mother’s back after hatching until they are ready to be on their own. The father does not help with the young as he flees after mating or risks being devoured by the females.

Six-Eyed Sand Spider Lifespan

This spider is a fantastic creature with many exciting adaptations that help it survive in its environment. Female six-eyed sand spiders can live for up to 15 years, which is much longer than most other spiders. The lifespan of the males is not known but is predicted to be much shorter than females.

The six-eyed sand spider can go without food or water for an entire year. This is possible because the spider has adapted to store water in its body for longer, which helps it to survive during times when food and water are scarce. Some threats include, but are not limited to:

  1. Predators
  2. Disease
  3. Parasites
  4. Lack of food and water for over a year

Six-Eyed Sand Spider Population

The Sicarius hahni is a species in the more prominent family of spiders known as Sicariidae, which contains over 38,000 different species.

It is one of the most venomous spiders in the world, and its bites can be fatal to humans. There are 38,000+ identifiable species of sand spiders. However, because these spiders are excellent at hiding, it may be that there are over 200,000+ sand spider species in existence, in the wild South African desert.

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About the Author

Lev Baker

Lev is a writer at AZ Animals who primarily covers topics on animals, geography, and plants. He has been writing for more than 4 years and loves researching topics and learning new things. His three biggest loves in the world are music, travel, and animals. He has his diving license and loves sea creatures. His favorite animal in the world is the manta ray.
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Six-Eyed Sand Spiders FAQs (Frequently Asked Questions)

The six-eyed sand spider is a carnivore as it primarily eats other animals.