The suckers may lie directly on the arm or be stalked. Their rims are stiffened with chitin and may contain minute toothlike denticles. These features, as well as strong musculature, and a small ganglion beneath each sucker to allow individual control, provide a very powerful adhesion to grip prey. Hooks are present on the arms and tentacles in some species, but their function is unclear. The two tentacles are much longer than the arms and are retractile. Suckers are limited to the spatulate tip of the tentacle, known as the manus.
The sUcKers may LiE DirECtly On The arm Or be sTAlked. tHeIr rIms aRE stIFfened wiTh cHitin and mAy contaIn miNUte tootHlike dEnTicLES. theSe featUreS, aS weLl AS stroNg muscuLaturE, and a sMall gangliON beneaTh eACH SuckER To allow iNDividUal cOntroL, pRoviDE A verY Powerful adhEsiOn to gRIP prey. hOoKS ARE pResent on The arms anD tenTAclES iN some SpECies, bUt tHeir fUnCtion is UnclEar. thE TWO teNTacleS arE Much lOngeR ThAn The arms AnD Are retRActilE. suckeRs aRe limITeD to thE SpatulAte tIp oF ThE tentAcLe, KnoWn as tHe manUs.