Giant squid are marine mollusks of the class Cephalopoda, represented by the eight species of the genus Architeuthis. They are deep-ocean dwellers that can grow to tremendous size: recent estimates put the maximum size at 10 m (33 ft) for males and 13 m (43 ft) for females from caudal fin to the tip of the two long tentacles. The mantle length, though, is only about 2 m (7 ft) in length (more for females, less for males), and the length of the squid excluding its tentacles is about 5 m (16 ft). However, there are reported claims of specimens of up to 20 m (66 ft), but none have been scientifically documented.