|Time period :||Late Carboniferous period|
|In the series|
|Brought back :||One Female|
|Appearances :||The Bug House|
Pulmonoscorpius (known in the series as simply a Giant Scorpion) featured as one of the main animals in Episode 5. The high oxygen level in the Carboniferous Period allowed this creature (and many others) to grow to very large sizes.
Nigel Marven woke up after a storm and uses a special ultraviolet light to show the giant scorpion. The creature climbs on crew memeber Bill but Nigel grabs him by the stinger and the Pulmonoscorpius use his pincers to attack Nigel. Nigel tells Bill, who woke up, he had a 3 foot long scorpion on him!
Nigel looked for a Pulmonoscorpius. He found a female nearly a meter long under a rotted-out fallen lycopsid log. She had thin claws, so Nigel was worried, because with scorpions, small claws mean big sting. He got her attention with a thin stick and worked his a hand behind her and grabs her telson just in front of her sting. As he put her in a dog carrier, she stung the back of his right hand as he let her go. Luckily, back at the park, Suzanne says it would not have an effect on him because he is a mammal, which hadn't evolved at the time. The scorpion was moved to her new home and is currently living in The Bug House without causing any further incidents.
- It was extinct by this time.
- Nigel states that this creature (as well as scorpions in general) evolved from Eurypterids. While it is true that the arachnids and the eurypterids are related, both belonging to the subphyla of the chelicerates, there is no direct link between the two classes and the Eurypterids are more closely related to the horseshoe crabs than to the scorpions. In addition, unlike what the documentary implies, the Eurypterids still existed in the Carboniferous, with many species that had adapted to live in the swamps and reached similar size to their relative of the Silurian and Devonian.