How Big Is the Giant Huntsman Spider?

The best-supported size figures come from the scientific description of Heteropoda maxima, published by arachnologist Peter Jäger in Zoosystema in 2001.

That paper described the species as reaching approximately 250 to 300 millimeters in leg span—roughly 9.8 to 11.8 inches—with a body length exceeding 46 millimeters, or about 1.8 inches.

The important word is leg span. A 30 cm huntsman does not have a 30 cm long body. Most of that impressive width comes from its extremely long legs.

This distinction is useful whenever spider size is discussed. If you are trying to measure or identify an unknown spider, our spider identification guide explains why body length, leg span, location and physical features should be recorded separately.

Is the Giant Huntsman the Biggest Spider in the World?

By leg span, yes—the giant huntsman is generally recognized as the largest known living spider. But “biggest” can mean different things in biology.

A 2017 peer-reviewed review of spider biological records identified Heteropoda maxima as the largest known spider by leg span, reaching up to about 30 cm. The same review discussed the Goliath birdeater, Theraphosa blondi, as the largest known spider by mass.

This is why statements such as “the world’s largest spider” need a qualifier. A giant huntsman may cover a wider area from leg tip to leg tip, while a large tarantula can have a far more massive body.

Leg Span and Body Length Are Not the Same Measurement

Search results and social-media posts often make large spiders sound even larger by mixing several different measurements. For spiders, at least three measurements can appear in descriptions:

• Body length — the length of the central body, not including the legs.
• Leg span — the approximate distance across the animal when the legs are extended.
• Individual leg length — the length of one leg, measured by its separate segments.

In the original description of Heteropoda maxima, Jäger reported individual leg measurements as well as overall dimensions. The legs were extraordinarily long relative to the body, which is one reason the spider can produce such a dramatic overall span.

For this reason, a photograph of a huntsman spider covering a wall, person’s hand or tree trunk should not automatically be treated as a reliable measurement. Perspective can greatly exaggerate apparent size.

Where Does Heteropoda maxima Live?

The current World Spider Catalog lists the distribution of Heteropoda maxima as Laos. A later taxonomic study published in 2009 also recorded the species from Khammouan Province, Laos while examining Heteropoda spiders associated with limestone caves.

The original 2001 description noted several features that suggested a cave-dwelling lifestyle, including elongated legs and palps, pale coloration and specialized hairs. Later research on Laotian cave Heteropoda provided additional context for spiders living in these limestone environments.

What Does the World’s Biggest Huntsman Spider Look Like?

Like other huntsman spiders, Heteropoda maxima belongs to the family Sparassidae. Huntsman spiders are often recognizable by a broad, relatively flattened posture and legs that extend outward and sideways rather than being held directly beneath the body.

This laterigrade leg orientation produces the crab-like appearance that gave huntsman spiders the alternative common name “giant crab spiders.”

The original description of H. maxima reported generally yellowish-brown coloration. However, color and overall size are not sufficient for a confident species-level identification.

If you are learning how spider groups are separated from one another, browse the Spider Types section for identification guides and family-level comparisons.

Can Every Huge Huntsman Spider Be Called Heteropoda maxima?

No. This is one of the most common problems with photographs labeled “giant huntsman spider” online.

Sparassidae is a diverse spider family, and several huntsman species can become conspicuously large. A spider’s apparent size in a photograph is therefore not enough to establish that it is H. maxima.

Taxonomists distinguish Heteropoda maxima from related species using detailed morphology, including characteristics of the male and female reproductive structures. Those features played an important role in both the original species description and later work on Heteropoda from Laos.

For a photograph-based identification, a more responsible approach is to combine:

• country and precise region where the spider was found;
• measured body length rather than estimated size;
• overall leg proportions and orientation;
• body shape and markings;
• habitat, such as a building, forest, bark or limestone cave;
• clear photographs from more than one angle.

When those details are missing, identifying a spider only as a huntsman spider or Sparassidae can be more scientifically responsible than assigning an exact species name.

Is the Giant Huntsman Spider Dangerous to Humans?

There is an important evidence gap here: published clinical research on huntsman bites should not automatically be interpreted as research specifically on Heteropoda maxima.

One prospective study examined 168 definite bites from Australian huntsman spiders in the family Sparassidae. The researchers found that the effects were generally minor, most commonly involving immediate, temporary pain together with local redness, puncture marks or bleeding. Minor systemic effects occurred in a small proportion of cases.

That study helps explain the medical effects of several Australian sparassid genera, but it does not establish a species-specific bite profile for the giant huntsman of Laos.

As with any wild spider, avoid handling it. If a bite causes severe pain, breathing difficulty, widespread symptoms or a rapidly worsening reaction, seek appropriate medical care rather than relying on an online species identification.

Frequently Asked Questions