Colossendeidae

Colossendeidae is a family of sea spiders (class Pycnogonida). This family includes more than 100 species distributed among six genera. These sea spiders inhabit the deep sea mostly but are also found in shallower waters, especially in Antarctic and Arctic waters.

== Description == Most colossendeids can grow to giant sizes as adults, far larger than any other sea spiders. The largest sea spider, Colossendeis colossea, can reach a leg span of 70 cm, whereas the subfamily Hedgpethiinae includes tiny species with leg span of less than 1 cm. Like most sea spiders, colossendeids usually have four pairs of legs in adults, except for three species, Decolopoda australis, D. qasimi, and Pentacolossendeis reticulata, with five leg pairs, and one species, Dodecolopoda mawsoni, with six leg pairs.