Asthenosoma varium

Yes, "Asthenosoma varium," commonly known as the fire urchin, is highly venomous and can be dangerous to humans. Unlike standard sea urchins, its spines are not rigid; they are covered in tiny, venom-filled sacs called pedicellariae that act like microscopic jaws. A sting from these spines causes immediate, severe, burning pain that can last for hours.

This venomous fire urchin is found primarily in the shallow coastal waters of the Indo-Pacific region. They typically inhabit coral reefs and rocky seabeds where they can hide in crevices during the day. Divers and snorkelers in the Red Sea and the Pacific Ocean frequently encounter them.

Like many bottom-dwelling marine invertebrates, the fire urchin is primarily a detritivore and an opportunistic carnivore. It uses its specialized mouthparts, known as Aristotle's lantern, to graze on algae, scavenged debris, and small benthic organisms. They play a crucial role in the reef ecosystem by cleaning up dead organic matter.

"Asthenosoma varium" has a distinctive, flattened, and somewhat flexible skeleton, unlike the rigid, spherical shape of typical sea urchins. It is covered in dense, blunt spines that are usually banded with bright, contrasting colors like orange, red, and white, serving as a warning to predators. The surface of the urchin often appears fuzzy or velvety due to the dense packing of its venomous pedicellariae.