What crawls, has 8 legs and can be scary and creepy?
Yes, that's correct.
But did you know that there are spiders at the bottom of the sea? They look like spiders but they're actually crabs.
The largest of these is the Japanese spider crab, Macrocheira kaempferi. It is endemic to southern Japan, found at depths between 50 to 400 m , hence the name; although its distribution has extended to eastern Taiwan . The largest known specimen on display at the Scheveningen Sea Life Center in the Netherlands has a legspan of 3.7 m and weighs 13.6 kg .
Little is known on the biology of this species. Thus, if you have other information on them, you can e-mail us at email@example.com or come be a collaborator.
 Huang JH, Yu H, Takeda M (1990) Occurrence of the giant spider crab, Macrocheira kaempferi (Temmink, 1836) (Crustacea, Decapoda, Majidae) in Taiwan. Bulletin of the Institute of Zoology, Academia Sinica 29(3):207-212.
Sizing ocean giants: patterns of intraspecific size variation in marine megafauna. PeerJ 3:e715.