Colossendeis colossea is a species of sea spider (class Pycnogonida) in the family Colossendeidae.

[2] The species was first described by Edmund B. Wilson in 1881.

[1][2] It is the largest pycnogonid species known to science, reaching a leg span of 70 cm (28 in).

Body length, including proboscis and abdomen, can reach 7 cm (2.8 in).

Colossendeis colossea is a deep-water species inhabiting continental slopes at depths between 420 and 5,200 m (1,380 and 17,060 ft) m.[3] It has a semi-cosmopolitan distribution[2] in all main oceans apart from the Arctic Ocean.