New World Tarantulas vs. Old World Tarantulas

Attribute	New World Tarantulas	Old World Tarantulas
Origin	Americas	Africa, Asia, Australia
Defensive Behavior	Urtricating hairs	Defensive postures and bites
Leg Span	Varies	Varies
Coloration	Varied, often bright	Varied, often earth tones
Size	Varies	Varies

Physical Attributes

New World tarantulas, which are native to the Americas, tend to have urticating hairs on their abdomens that they can kick off as a defense mechanism. These hairs can cause irritation and even allergic reactions in predators. In contrast, Old World tarantulas, found in Asia, Africa, and Australia, lack these urticating hairs. Instead, they rely on their speed and venom to defend themselves.

Another physical difference between the two groups is their size. New World tarantulas are generally larger and bulkier compared to their Old World counterparts. This can make them more intimidating to some people, but it also means they have more power behind their bites and venom.

Behavior

New World tarantulas are known for their defensive behavior, often kicking urticating hairs or assuming a threat posture when threatened. They are also more likely to flick these hairs when disturbed, as a way to deter predators. On the other hand, Old World tarantulas tend to be more aggressive and will not hesitate to bite if they feel threatened. They are also known for their speed and agility, making them formidable predators in their natural habitats.

Venom

One of the most significant differences between New World and Old World tarantulas is the potency of their venom. New World tarantulas generally have less potent venom compared to their Old World counterparts. While their bites can still be painful and cause localized swelling, they are not considered medically significant to humans. In contrast, Old World tarantulas have venom that can be more potent and potentially dangerous to humans. Their bites can cause severe pain, muscle cramping, and even systemic effects in some cases.

Habitat

New World tarantulas are typically found in the Americas, with species ranging from the southern United States down to Argentina. They inhabit a variety of environments, from deserts to rainforests. Old World tarantulas, on the other hand, are found in Asia, Africa, and Australia. They are adapted to a wide range of habitats, including deserts, grasslands, and tropical forests. Their distribution is more widespread compared to New World tarantulas.

Coloration

New World tarantulas often have vibrant coloration, with species displaying hues of red, orange, and blue. This bright coloration can serve as a warning to potential predators, signaling that the tarantula is venomous or dangerous. In contrast, Old World tarantulas tend to have more subdued coloration, with shades of brown, black, and grey being common. This camouflaged coloration helps them blend into their surroundings and ambush prey more effectively.

Reproduction

Both New World and Old World tarantulas go through a similar reproductive process, with males using specialized structures on their pedipalps to transfer sperm to the female during mating. However, there are some differences in behavior between the two groups. New World tarantulas are known for their elaborate courtship rituals, with males performing intricate dances and drumming on the ground to attract females. In contrast, Old World tarantulas tend to have more straightforward mating behaviors, with males approaching females cautiously to avoid being mistaken for prey.

Conclusion

While New World and Old World tarantulas share many similarities, such as their eight legs and ability to produce silk, there are also significant differences between the two groups. From their physical attributes to their behavior and venom potency, each group has unique characteristics that set them apart. Whether you prefer the vibrant colors of New World tarantulas or the stealthy hunting tactics of Old World tarantulas, both groups offer fascinating insights into the world of these fascinating arachnids.