Eurypterids such as Megarachne are often called "sea scorpions", but the strata in which Megarachne has been found indicates that it dwelled in freshwater and not in marine environments. With a body length of 54 cm (21 in), Megarachne was a medium-sized eurypterid.

It's sort of a cross between a scorpion and a true spider, with two gigantic chelicerae (fangs) that it uses for biting and for making creepy spider sounds (stridulation). Mostly. Its scientific name, Poecilotheria, translates from Greek to mean "spotted wild beast." [3], Megarachne was very similar to other mycteroptid eurypterids in appearance, a group distinguished from other mycteropoids by the parabolic shape of their prosoma (the head plate), hastate telsons (the hindmost part of the body being shaped like a gladius, a Roman sword) with paired keel-shaped projections on the underside,[4] and heads with small compound eyes that were roughly trapezoidal in shape. Where It Lives: The giant huntsman is only found in a cave in Laos, but related enormous huntsman spiders live in all the warm and temperate regions of the planet. The king baboon spider (Pelinobius muticus) lives in East Africa and slowly grows to 7.9 inches (20 cm). Shining the spotlight on celebrity creepy-crawlies, How to set or break a Guinness World Records title. They mostly come at night. As its name implies, it wanders searching for a meal. What makes a Guinness World Records title? The largest spiders produce sounds (stridulation) loud enough for humans to hear. [8], In 2005, a second, more complete specimen consisting of a part and counterpart (the matching halves of a compression fossil) was recovered, preserving parts of the front section of the body, as well as coxae possibly from the fourth pair of appendages, was recovered from the same locality and horizon. [1], Megarachne was part of the stylonurine suborder, a relatively rare clade of eurypterids. WHAT MAKES A GUINNESS WORLD RECORDS TITLE? Harpactirinae is another subfamily of spiders commonly called baboon spiders.

Brazilian Salmon Pink Birdeater: 11 Inches, ©MPirajá Nature Photography / Getty Images. Do you suffer from a fear of spiders or arachnophobia? Among them, the raised lunules (the vaguely moon-shaped ornamentation, similar to scales) and the cuticular sculpture of the mucrones (a dividing ridge continuing uninterrupted throughout the carapace, the part of the exoskeleton which covers the head) are especially important since these features are characteristic of eurypterids. The Brazilian wandering spider (Phoneutria fera) or banana spider looks like a tarantula, but it isn't one. Within the stylonurines, Megarachne is a member of the superfamily Mycteropoidea and its constituent family Mycteropidae, which includes the close relatives Woodwardopterus and Mycterops. Megarachne is a genus of eurypterid, an extinct group of aquatic arthropods. That's bad, because tarantulas, as a whole, aren't out to get you and aren't particularly venomous. [4], Fossilized remains of the second tergite of the mycteroptid Woodwardopterus were compared to the fossil remains of Megarachne by Selden and colleagues (2005), which revealed that they were virtually identical, including features previously not noted in Woodwardopterus, such as radiating lines covering the tergite. This climate change likely occurred during the Middle Carboniferous due to falling CO2 levels in the atmosphere and high oxygen levels. Hünicken's identification relied heavily on X-ray microtomography of the holotype. The generic name, composed of the Ancient Greek μέγας (megas) meaning "great" and Latin arachne meaning "spider", translates to "great spider".

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