European squid propulsion. The posterior border is slightly concave. The head is relatively small and has large eyes which are covered with a transparent membrane. Like almost all squid, this species has ten limbs surrounding the mouth and beak: eight are relatively short arms, and two, which form the tentacles, are long, as they are used to catch prey. The fourth left arm of males is a hectocotylus. The European squid can grow up to 30–40 cm in the mantle length, but more usually they are 15–25 cm long. The males are generally bigger than the females and exhibit more rapid rates
Vampire squid If a predator were to bite off an arm tip, the vampire squid can regenerate it. They have eight arms but lack feeding tentacles, and instead use two retractile filaments in order to capture food. They combine the waste with mucus secreted from suckers to form balls of food. They feed on detritus, including the remains of gelatinous zooplankton (such as salps, larvaceans, and medusae jellies) and complete copepods, ostracods, amphipods, and isopods. Vampire squids have been found among the stomach contents of large, deepwater fish, including giant grenadiers, and deep-diving mammals, such as whales and sea lions. The Vampyromorphida