Spiders in El Salvador

What spiders live in El Salvador?

El Salvador is the smallest country in Central America and one of the most vertically varied: within a two-hour drive you cross hot Pacific coastal plain, a volcanic belt of cane and shaded coffee, and cool cloud forest on the northern ridges. Together they hold several hundred species, most of them small web-builders nobody notices.

The animals people photograph are the orb-weavers. The tropical orb-weaver spins a large wheel across footpaths after dark and takes it down before dawn; the spinybacked orbweaver hangs in coffee shade like an enamel button with six black spines; arrow-shaped micrathena and Mabel's orchard orb weaver work at face height along forest edge. The biggest webs belong to the golden silk orb-weavers, whose yellow silk catches the light across riverside gaps.

The hunters build no capture web. The green lynx waits on flower heads and takes bees in mid-air; jumping spiders stalk foliage and sunlit plaster, the emerald jumping spider on leaves and the gray wall jumping spider on walls and posts. On volcanic slopes, tarantulas such as the Costa Rican zebra tarantula wait at the mouth of silk-lined burrows at dusk.

Which Salvadoran spiders are genuinely dangerous?

Three genera, and no others. Widow spiders of the genus Latrodectus are the ones you are most likely to meet: black widows in rubble, woodpiles, meter boxes and under garden furniture, and the introduced brown widow, now common around lowland buildings and best identified by its spiky, cotton-boll egg sac rather than by colour. A widow bite produces latrodectism — sharp local pain, then cramping in the abdomen, back and thighs, sweating and a rising heart rate over several hours. It is worth a hospital visit, but deaths are very rare and antivenom for Latin American widows exists.

Recluses, genus Loxosceles, are the second group: small, uniformly tan, six-eyed and long-legged. They occupy the dry undisturbed spaces where people put their hands — behind stacked boards, inside cardboard, in clothing folded away for months — and bite only when pressed against skin. A minority of bites develop the slow-healing ulcer that gives the genus its reputation. This is the only spider in the country whose bite can leave a lasting wound, and it is the real source of the "necrotising" warning older lists apply to the whole Salvadoran fauna — a blanket claim that is simply false.

Third, wandering spiders. Phoneutria boliviensis is recorded across Central America and is the only member of its genus that plausibly reaches Salvadoran lowlands, usually in banana and plantain. Bites hurt at once and can bring sweating and agitation, but Central American cases are consistently milder than the genus's Brazilian reputation implies.

Where you actually meet them

In and around the house

Houses collect a predictable set: cellar spiders in bathroom corners, cobweb spiders behind furniture, jumping spiders on sunlit outside walls, and large flat huntsman spiders that appear at night and vanish behind a picture frame. Widows and recluses prefer the margins — pila surrounds, meter boxes, stored building materials, the gap behind a wardrobe that has not moved in a year.

Gardens, cane and coffee

The shade-coffee belt on the volcanic slopes is the richest spider habitat in the country. Orb-weavers rebuild between the bushes nightly, lynx spiders patrol flowering understorey, and the litter holds wolf spiders and ground hunters.

Forest and volcanic slope

Cloud forest on Montecristo and the upper volcano slopes supports species that never reach the coast. Dry forest and barranca walls in the south suit tarantulas, which take burrows under rocks and roots and are most visible when males wander in search of females.

Spider season and the rains

El Salvador has two seasons rather than four, and spiders follow the water. The dry season from November to April thins the visible fauna: webs are torn by wind and dust, and many species retreat to shaded gullies. The rains from May to October bring an explosion of flying insects, and spider numbers climb with them.

The peak for large webs is the end of the wet season, roughly September to November, when orb-weavers hatched in the early rains reach adult size and male tarantulas cross patios at dusk. Cellar spiders and huntsmen carry on indoors all year, because a Salvadoran house never gets cold enough to interrupt them.

Big spiders that are not the dangerous ones

Most alarm here is caused by size, not venom. The tiger bromeliad spider, Cupiennius salei, is the classic case: it is routinely labelled "large wandering spider", which makes people assume it is a Phoneutria. It is not. It sits in a different genus, lives in bromeliads, bananas and heliconias, and its bite causes brief local pain and nothing more.

The pantropical huntsman, Heteropoda venatoria, is the flat, fast, straw-brown spider on the bedroom wall: a leg span the width of a hand, no medical significance whatever, and one of the best cockroach controllers a tropical house can have. Tarantulas are the same story — impressive fangs, weak venom, and a real irritant that is not the bite but the cloud of urticating hairs a disturbed spider kicks off its abdomen.

Two frequent reports are not spiders. Tailless whip scorpions, the flat black arachnids with whip-like front legs on bathroom walls at night, have no venom glands at all. Harvestmen, with one oval body and no waist, make no silk and have no venom either. For perspective on the few spiders worldwide that warrant caution, see our round-up of the most venomous spiders.

Common Spiders in El Salvador

• Spined Micrathena (Micrathena gracilis)
• Silver Garden Orb Weaver Spiders (Argiope argentata)
• Arrowhead Orb Weaver Spiders (Verrucosa arenata)
• Pretty Orbweaver (Eriophora nephiloides)

Biggest Spiders in El Salvador

• Tiger Bromeliad Spider (Cupiennius salei) also known as Large Wandering Spider and American Wandering Spider
• Costa Rican Blue Front Tarantula (Aphonopelma crinirufum)
• Guatemalan Tiger Rumped Tarantula (Davus pentaloris)
• Golden Silk Spider (Trichonephila clavipes)
• Pantropical Huntsman Spider (Heteropoda venatoria)

Most Venomous Spiders in El Salvador

Cobweb Spiders/Tangle Web Spiders (Theridiidae)

Cobweb SpidersBrown Widow (Latrodectus geometricus)Identify the brown widow (Latrodectus geometricus) by its orange hourglass and spiky egg sac, and learn how its bite compares with a black wCobweb SpidersWidow (Latrodectus)A guide to the widow spiders (Latrodectus): how to identify the genus, the species you may meet, the gumfoot web, and how serious a widow bi

Less Venomous Spiders in El Salvador

Lynx Family

Lynx SpidersGreen Lynx (Peucetia viridans)Identify the green lynx spider (Peucetia viridans): bright green body, spined legs, orange eggs, where it lives and whether its bite is dang

Jumping Spiders

Jumping SpidersEmerald Jumping Spider (Paraphidippus aurantius)Identify the emerald jumping spider (Paraphidippus aurantius): its iridescent green scales, real size, range from the USA to Panama, and wheJumping SpidersGray Wall Jumping (Menemerus bivittatus)Identify the gray wall jumping spider (Menemerus bivittatus): size, the flattened grey-haired body, its walls-and-tree-trunks habitat, and w

Orb Weavers

Orb WeaversTropical Orb-weaver (Eriophora ravilla)Identify the tropical orb-weaver (Eriophora ravilla): size, colour forms, the huge orb it builds and eats each night, its Gulf Coast range aOrb WeaversWestern Spotted Orbweaver Spider (Neoscona oaxacensis)Identify the western spotted orbweaver (Neoscona oaxacensis): size, mottled black-and-white abdomen, its nightly orb web, range and whether Orb WeaversArrow-shaped Micrathena (Micrathena sagittata)Identify the arrow-shaped micrathena (Micrathena sagittata): the yellow arrowhead abdomen, its two long rear spines, web, range, season and Orb WeaversGolden Silk Orb-Weaver (Nephila)Golden silk orb-weavers (Nephila): huge females, tiny males, giant golden webs, where they live, what they eat and whether their bite is danOrb WeaversSpinybacked Orbweaver (Gasteracantha cancriformis)Spinybacked orbweaver (Gasteracantha cancriformis) identification: six abdominal spines, colour forms, the silk-tufted web, range and whetheLong-Jawed SpidersMabel's Orchard Orb Weaver Spider (Leucauge argyrobapta)Identify Mabel's orchard orb weaver (Leucauge argyrobapta): size, silver and green colouring, its horizontal web, range, and how it differs

Tarantulas

TarantulasCosta Rican Zebra Tarantula (Aphonopelma seemanni)Identify the Costa Rican zebra tarantula (Aphonopelma seemanni): white leg stripes, deep burrows, Central American range, urticating hairs a

Living with spiders in El Salvador

Spiders here remove an enormous volume of mosquitoes, flies, moths and cockroaches, and the genera that matter are managed by habit rather than by spraying — insecticide rarely reaches the cracks where widows and recluses sit.

• Wear gloves when you move stacked wood, bricks, roof sheets or stored boards, and lift them away from you.
• Shake out boots and work gloves, and do not leave shoes outside overnight.
• Store clothes and bedding in sealed boxes rather than open cardboard.
• Keep the strip around the house clear of rubble and cut vegetation, which is where widows build.
• Brush out corners, meter boxes and pila surrounds; removing webs and egg sacs beats spraying.
• Leave garden orb-weavers alone — one adult female clears thousands of insects before the dry season ends.

This fauna continues almost unchanged across the border into Guatemala. To understand what those big overnight webs are doing, read our guide to spider webs.