Theraphosa apophysis (the pinkfoot goliath) was described 187 years after the goliath birdeater, so its characteristics are not as well attested. The fang size of this tarantula reaches a maximum of 4 cm ( 1 + 1⁄ 2 in). Some of the largest species of tarantula may weigh over 85 g (3 oz) the largest of all, the goliath birdeater ( Theraphosa blondi) from Venezuela and Brazil, has been reported to attain a weight of 170 g (6 oz) and a leg-span up to 30 cm (12 in), males being longer and females greater in girth. Leg span is determined by measuring from the tip of the back leg to the tip of the front leg on the opposite side. This waist-like connecting piece is actually part of the prosoma and gives the opisthosoma a wide range of motion relative to the prosoma.ĭepending on the species, the body length of tarantulas ranges from about 5 to 11 cm (2 to 4 + 1⁄ 2 in) with leg spans of 8–30 cm (3–12 in).

The prosoma and opisthosoma are connected by the pedicel, or pregenital somite. Like other Arachnida, a tarantula's body comprises two main parts, the prosoma (or cephalothorax) and the opisthosoma (or abdomen). Like all arthropods, the tarantula is an invertebrate that relies on an exoskeleton for muscular support. Many New World species kept as pets have setae known as urticating hairs that can cause irritation to the skin, and in extreme cases, cause damage to the eyes. Some of the more common species have become popular in the exotic pet trade. The term 'tarantula' is usually used to describe members of the family Theraphosidae, although many other members of the same infraorder ( Mygalomorphae) are commonly referred to as 'tarantulas' or 'false tarantulas'. As of August 2022, 1,040 species have been identified, with 156 genera. Tarantulas comprise a group of large and often hairy spiders of the family Theraphosidae.

Mexican pink tarantula, Brachypelma klaasi

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