Tarantula
Large, hairy spiders of the family Theraphosidae.
Tarantulas are large, often hairy spiders belonging to the family Theraphosidae, with over a thousand identified species spread across nearly 200 genera. While the name typically refers to members of this family, other spiders in the same infraorder (Mygalomorphae) are sometimes called tarantulas or false tarantulas. Several common species have gained popularity in the exotic pet trade.
Like all arthropods, tarantulas are invertebrates with an exoskeleton for support. Their bodies, like those of other arachnids, have two main parts: the prosoma (cephalothorax) and the opisthosoma (abdomen), connected by a waist-like pedicel that allows the abdomen a wide range of motion. Body length varies by species from about 5 to 11 cm (2 to 4.5 inches), with leg spans of 8 to 30 cm (3 to 12 inches), measured from the tip of one back leg to the tip of the opposite front leg. The largest species can weigh over 85 grams (3 ounces); the goliath birdeater (*Theraphosa blondi*) from Venezuela and Brazil may reach 170 grams (6 ounces) and a leg span of 30 cm (12 inches), with males longer and females bulkier. Its fangs can be up to 4 cm (1.5 inches) long. The pinkfoot goliath (*Theraphosa apophysis*) was described 187 years later, so its traits are less documented; *T. blondi* is generally considered the heaviest, while *T. apophysis* has the greatest leg span. Two other species, the Brazilian salmon birdeater (*Lasiodora parahybana*) and *Lasiodora klugi*, rival these giants in size.
Most North American tarantulas are brown, but elsewhere species display colors like cobalt blue (*Cyriopagopus lividus*), black with white stripes (*Aphonopelma seemanni*), yellow leg markings (*Eupalaestrus campestratus*), or metallic blue legs with a vibrant orange abdomen and green prosoma (*Chromatopelma cyaneopubescens*). Their natural habitats include savanna, grassland (such as pampas), rainforest, desert, scrubland, mountains, and cloud forest. They are generally terrestrial and live in burrows. Tarantulas are increasingly kept as pets, with some species readily available in captivity.
Tarantulas can be mistaken for other mygalomorphs, like trapdoor spiders, funnel-web spiders, and purseweb spiders, as well as some araneomorphs, such as wolf spiders (Lycosidae). Several features help identify them. Most tarantulas in the Americas have urticating hairs (though some, like those in the genus *Hemirrhagus*, lack them), which are more noticeable than on most spiders. They tend to be larger, but size alone isn’t reliable. Unlike many spiders, they don’t use webs for hunting, only as building material or tripwires. A key distinction is their fangs: tarantula fangs face downward, while true spiders’ fangs face each other, allowing pincerlike motions. Tarantulas also have two book lungs (true spiders have one) and generally live longer.
The name “tarantula” originally referred to *Lycosa tarantula*, a Mediterranean wolf spider, and comes from the Italian town of Taranto. Over time, the term was applied to almost any large, unfamiliar ground-dwelling spider, especially mygalomorphs and New World Theraphosidae. Wolf spiders are not particularly large or hairy, so English speakers eventually shifted the name to the Theraphosidae, despite their distant relation. The name is also incorrectly used for other large-bodied spiders, such as purseweb spiders (atypical tarantulas), funnel-webs (Dipluridae and Hexathelidae), and dwarf tarantulas—all mygalomorphs but in different families. Huntsman spiders (Sparassidae) are also sometimes called tarantulas due to their size, but they belong to the infraorder Araneomorphae and are not related.
Many theraphosid genus names contain the element “pelma,” tracing back to Carl Ludwig Koch in 1850. In describing his new genus *Eurypelma*, he noted the wide velvet-brush (scopula) on the footsole. German arachnologists use “Fuß” for the tarsus, and “Sammetbürste” translates to “scopula” in Latin. “Eury-” comes from Greek *eurýs* (wide), and “pélma” means sole of the foot, paralleling Koch’s use of “Fußsohle.” So *Eurypelma* literally means “wide footsole,” but arachnologists interpret “pelma” in such names as referring to the scopula, giving the meaning “with a wide scopula.” Other genus names or synonyms containing “pelma” follow this pattern.
- field
- Arachnology
- known_for
- Large, hairy spiders of the family Theraphosidae; popular in the exotic pet trade
Lore & Background
Tarantulas are invertebrates that rely on an exoskeleton for muscular support. Their body comprises two main parts, the prosoma and the opisthosoma, connected by the pedicel. Depending on the species, body length ranges from about 5 to 11 cm with leg spans of 8–30 cm. Tarantulas have fangs that face downward, unlike true spiders, and they possess two book lungs. Their natural habitats include savanna, grassland, rainforest, desert, scrubland, mountains, and cloud forest. They are burrowers that live in the ground.
Reader's Guide
They have become increasingly popular as pets, with many New World species kept in captivity possessing urticating hairs that can cause skin irritation or eye damage. The name 'tarantula' originally referred to a wolf spider from Mediterranean Europe, but usage shifted to the Theraphosidae. Tarantulas are distinguished from other spiders by their downward-facing fangs, two book lungs, and longer lifespan. They do not use webs for hunting but instead use silk for burrow lining or as tripwires. Their distribution spans the Americas, Africa, much of Asia, Australia, and parts of Europe. The largest species can kill and consume small vertebrates such as lizards, mice, bats, birds, and small snakes.
Did You Know?
- Tarantula fangs face downward, while true spiders' fangs face each other.
- Many New World tarantulas have urticating hairs that can cause skin irritation or eye damage.
- The name 'tarantula' originally came from the Italian town of Taranto and referred to a wolf spider.
Tarantula Species on the Culinary Map
Among the roughly fifteen spider species that have been formally documented in scientific literature as suitable for human consumption, tarantulas hold a notable position. The Thailand zebra leg tarantula, identified by its binomial name Cyriopagopus albostriatus, is prepared fried and sold as a traditional snack in both Cambodia and Thailand. Its relative, the Thailand Black (Cyriopagopus minax), occupies a similar place in regional food customs. The Goliath birdeater (Theraphosa blondi) is another tarantula species listed among those with a documented history of human eating. Beyond these named examples, several other tarantula species are included in the broader catalogue of scientifically described edible spiders. Together, these entries reveal that tarantulas have been woven into the dietary practices of multiple cultures, appearing not as exotic curiosities but as established components of local food traditions that have persisted over time.
Arachnids Beyond the Tarantula
The tarantula is only one thread in a much wider tapestry of arachnid consumption that spans the entire class. Arachnids encompass spiders, scorpions, and mites (which include ticks), and each group has found its way onto human plates in different parts of the world. In Shandong province, China, fried scorpion is a long-standing traditional dish, representing one of the most recognizable examples of scorpion cuisine. In the Pacific island of New Caledonia, the golden orb-weaving spider (Trichonephila edulis) is eaten and is reportedly said to taste like pâté, a comparison that speaks to the richness of its flavour. Meanwhile, in the realm of mites, entire categories of food have been shaped by these tiny arachnids, most notably in the production of specialty cheeses in Germany and France. The breadth of these examples demonstrates that arachnid consumption is neither a single regional oddity nor limited to one order of the class; it is a genuinely global and multi-lineage food tradition.
From Raw to Ready: How Arachnids Are Prepared
Turning a live arachnid into a plate-ready dish involves a set of practical processing steps that vary by species and cultural context. The most common preparation method across the documented examples is heating, which serves both to cook the flesh and to neutralise potential biological hazards. For spiders with prominent fangs, defanging is a critical safety step in the preparation sequence, ensuring the diner is not at risk from the very apparatus that makes the animal dangerous in the wild. In certain cases, the processing extends further: arachnids may be dried and then ground into a powder, transforming them from a whole-animal snack into an ingredient that can be folded into other food products. This grinding step is particularly relevant in the context of mite-based cheeses, where the tiny creatures become an integral part of the cheese-making process rather than a standalone dish. The range of techniques, from simple frying to multi-stage drying and milling, shows that arachnid cuisine is far from a single, uniform practice.
Mite Cheeses and the Fine Line of Safety
Perhaps the most unexpected intersection of arachnids and human food is found in the world of cheese-making, where mites play a deliberate and traditional role. Milbenkäse, a German speciality, and Mimolette, a cheese traditionally produced around the city of Lille in France, both rely on mites as part of their character and production. In these cases, the mites are not contaminants but functional ingredients, contributing to the cheese's development in a way that has been passed down through generations of cheesemakers. However, this practice carries a documented safety caveat: consuming cheese mites in quantities exceeding the standard threshold of six mites per cubic inch can trigger an allergic reaction in some individuals. This limit underscores that even within a long-established culinary tradition, there are biological boundaries that must be respected. The mite-cheese relationship thus sits at a fascinating crossroads of gastronomy, microbiology, and food safety, reminding us that the line between a cherished ingredient and a potential allergen can be measured in fractions of a cubic inch.
Frequently Asked Questions
What is a tarantula?
Tarantulas are large, typically hairy spiders belonging to the family Theraphosidae. They are a well-known group within the broader infraorder Mygalomorphae.
Are all spiders called 'tarantulas' actually in the same family?
Not quite. While the name most properly refers to members of Theraphosidae, many other Mygalomorph spiders are colloquially called 'false tarantulas' even though they belong to different families.
What field of study covers tarantulas?
Tarantulas fall under arachnology, the branch of zoology dedicated to the study of spiders and their close relatives.
Why do so many people keep tarantulas as pets?
Several common species have become favorites in the exotic pet trade because of their manageable size, relatively long lifespans, and striking appearance.
What physical traits make tarantulas stand out among spiders?
They are notably large and usually covered in dense hair, which distinguishes them from many other spider families and gives them their distinctive, fuzzy look.
More in Arachnids & Myriapods 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record
