Mustached Jumping Spider (Phidippus mystaceus): Care, Identification & Diet

The mustached jumping spider, Phidippus mystaceus, is a North American jumping spider in the family Salticidae. BugGuide lists adults at about 16 mm body length, making this a medium-sized jumper rather than one of the giant Phidippus species. Its range extends from Connecticut south to Florida and west to Colorado and Texas, though local appearance can vary a lot in color and pattern. That variation is one reason this species is often confused with other Phidippus spiders, especially by new keepers.

The common name comes from the facial look that can resemble a little mustache. Adult males are usually easier to identify than females. BugGuide notes that the species is variable and that female identification can overlap with similar species such as Phidippus otiosus. For pet parents, that means a photo-based ID from a trusted arachnid source is more reliable than color alone.

In captivity, care is broadly similar to other small to medium jumping spiders. They do best in a clean, well-ventilated vertical enclosure with secure climbing surfaces, a dry-to-lightly humid environment, and appropriately sized live prey. They are visual hunters, so they usually do better with space to perch, stalk, and jump than with a flat terrestrial setup.

These spiders are fascinating to watch, but they are still delicate invertebrates. Handling should be optional, brief, and low-risk. A short fall, overheating, poor ventilation, or prey left in the enclosure during a molt can be more dangerous than many pet parents expect.

There is not a large veterinary literature base specific to Phidippus mystaceus, so most health guidance comes from general jumping spider husbandry and invertebrate medicine principles. The most common problems in captivity are husbandry-related rather than infectious disease. Dehydration, failed molts, trauma from falls, overheating, poor ventilation, and stress from repeated disturbance are more likely than a true contagious illness.

A healthy mustached jumping spider is alert, able to grip surfaces, and interested in movement around it. Concerning signs include persistent curling under, repeated slipping, inability to climb, a shrunken abdomen, refusal to drink, or being stuck in a molt. If your spider is hanging in a silk retreat and looks dull or swollen, it may be preparing to molt rather than becoming ill. During that time, feeder insects should not be left loose in the enclosure.

Older adults may naturally slow down, eat less, and spend more time in a retreat near the end of life. That can be normal. Sudden weakness, however, is not something to ignore. If you have access to an exotics-focused veterinarian, your vet can help rule out environmental causes and guide supportive care. For many spiders, correcting enclosure setup, hydration access, and prey size is the most practical first step.

Chemical exposure is another underrecognized risk. Aerosols, scented cleaners, essential oils, smoke, and pesticide residues can be harmful to arachnids. Even if the spider never touches the product directly, residues on enclosure decor or in room air may cause serious problems.

Mustached jumping spiders are usually inexpensive to maintain once the enclosure is set up, but startup costs can vary a lot. If you ethically keep a legally collected local spider where allowed, your initial supply cost may be limited to the enclosure and feeder insects. If you buy a captive-bred jumper from a specialty breeder, the spider itself often falls in the roughly $20-$60 range for common to moderately available Phidippus species, with overnight shipping sometimes adding $35-$60.

A basic enclosure setup often costs about $20-$60 if you use a simple ventilated acrylic or plastic habitat. Premium display enclosures marketed for jumping spiders commonly run about $50-$70 before decor. Add climbing decor, a hide, substrate or liner, and a mister, and many pet parents spend about $35-$100 total for a polished setup.

Ongoing monthly costs are usually modest. Feeder insects such as fruit flies, small flies, or mealworms may run about $5-$15 per month for one spider, depending on life stage and whether you culture feeders at home. Replacement decor, occasional enclosure upgrades, and losses from feeder die-off can raise that total.

Veterinary care is the hardest cost to predict because not every clinic sees spiders. If your vet or a local exotics practice offers an invertebrate exam, a consultation may range from about $60-$150, with diagnostics often limited by size and species. Many care decisions for pet spiders are therefore based on husbandry correction and observation rather than intensive medical treatment.

Mustached jumping spiders are insectivores. In the wild, Phidippus species hunt live arthropod prey using vision rather than webs. In captivity, the safest plan is to offer live prey that is smaller than or roughly equal to the spider's body length, adjusted for age and confidence. Good options can include flightless fruit flies for spiderlings, then bottle flies, house flies, small crickets, or small mealworms for juveniles and adults.

Variety matters. Rotating feeder types may help support balanced nutrition and normal hunting behavior. Prey should be healthy and appropriately sized. Oversized crickets can injure a spider, especially during premolt or right after molting. Mealworms are useful for some individuals, but they should not be the only feeder for every spider if better movement-rich prey is available.

Hydration is as important as food. Many jumping spiders drink from fine droplets on enclosure walls or decor rather than from a standing water bowl. Light misting on one side of the enclosure or offering a small water droplet can help, while still keeping airflow strong enough to prevent stale, damp conditions. The exact schedule depends on room humidity, enclosure type, and your spider's age.

If your spider refuses food, look at the whole picture before assuming illness. Premolt, low temperatures, stress after rehousing, prey that is too large, and old age can all reduce appetite. If your spider is otherwise alert and hydrated, a short fasting period may be normal. If weakness, shriveling, or repeated missed strikes are also present, your vet can help you decide what to do next.

Jumping spiders do not need exercise in the same way a dog or cat does, but they do need opportunities to climb, explore, and hunt. A vertical enclosure with anchor points near the top supports normal behavior because many jumpers build silk retreats in upper corners. Cork bark, silk-safe artificial foliage, and textured surfaces can all help your spider move confidently.

This species is usually most active during daylight hours, especially in bright ambient light. That does not mean direct sun is safe. A sunny windowsill can overheat a small enclosure very quickly. Bright indirect light is a better choice, with a stable room temperature and good ventilation.

Short, supervised exploration outside the enclosure is optional, not required. For many pet parents, enrichment is better provided through enclosure design and prey presentation than through handling. If you do allow your spider onto your hand, stay low over a soft surface and avoid sudden movements. Even a small fall can cause serious injury.

A spider that stops roaming for a few days may be resting, settling in, or preparing to molt. A spider that cannot grip, repeatedly falls, or remains motionless in an exposed area is more concerning. In those cases, review temperature, humidity, hydration, and enclosure safety first, then contact your vet if the problem continues.

Preventive care for a mustached jumping spider is mostly about good husbandry. Start with a secure, escape-proof enclosure that opens in a way that does not destroy the spider's upper retreat every time you feed or clean. Cross-ventilation is important. So is avoiding sharp decor, sticky residues, pesticide exposure, and direct heat sources.

Keep cleaning gentle and targeted. Remove uneaten prey, old molts, and visible waste, but avoid frequent full tear-downs that force the spider to rebuild constantly. If you use artificial plants or decor, rinse them thoroughly before use and avoid scented products. For wild-caught spiders, quarantine away from other invertebrates when possible and watch for poor appetite, lethargy, or egg sac production.

Molting periods deserve extra caution. A spider in premolt may seal itself into a silk retreat, stop eating, and become less active. During that time, reduce disturbance and do not leave potentially harmful feeder insects loose in the enclosure. After the molt, wait until the spider is fully hardened and moving normally before offering prey.

Routine veterinary visits are not standard for every spider, but your vet can still be a helpful resource if your pet has repeated molting trouble, unexplained weakness, trauma, or possible toxin exposure. For most pet parents, the best preventive plan is steady temperatures, safe hydration, clean airflow, and prey matched to the spider's size and life stage.