Difference Between Tentacles and Arms

Tentacles vs Arms
 

It would always be interesting to compare and contrast the tentacles and arms as they both sound alike, and at the same time, the differences could also be understood. The information presented here about tentacles and arms are sensible to the reader, as there is specific comparison between the characteristics of the two subjects.

Tentacles

Tentacles are flexible and elongated external processes or organs, found mainly in invertebrate animals. Tentacles are also known as bothridia, and sometimes it is referred to describe the leaves of insectivorous plants. Tentacles are important for animals in feeding, sensing, grasping, and locomotion. Those are well equipped for the particular function or functions. Suckers present on the tentacles of squids and octopus species, so that the grasping of a prey would be easy. The suckers on the tentacles of cephalopods are more powerful in comparison with those in the rest of the molluscs. The small antennae in the snails and slugs are another type of tentacles, which are useful in sensory function or in sensing the environment. The tentacles of Jellyfish are functioning in a fascinating modus operandi, which mainly includes the paralysing of prey animals via venomous shocks from their nematocysts. The magnitude of this method could be very high, as they can sometimes paralyse a shark or large tuna fish. Large colonies of jellyfish make those venomous stingy areas in the sea by having nematocysts on their tentacles. In addition, the specialized tentacles of jellyfish can also perform the capturing and digestion of their food or prey. Despite the presence of tentacles in invertebrates and sometimes in plants, the potencies are always considerable.

Arms

Arms are highly diversified organs, but mainly the forelimbs of animals. Usually, arms are found in both vertebrates and invertebrates. However, the main difference between those is that, the invertebrate arms are more flexible than the vertebrate arms. The arms of primates are particularly interesting, as there are opposable fingers, in vertebrates. Therefore, they can climb on trees using these prehensile appendages. The invertebrate arms mainly include the ones in squids, octopus, and cuttlefish. They all have two arms in each animal. The invertebrate arms have suckers to help grasping food items. The transverse muscles of their arms enable to manipulate finely via bending movements. In addition, the invertebrate arms are useful for them to attach to surfaces while resting. On the other hand, human and other primate arms are equipped with finely moveable fingers. Therefore, the effectiveness of the primate arms is very high. In other words, arms are value added external appendages of animals.

What is the difference between Tentacles and Arms?

• Tentacles are usually found among invertebrates and sometimes in certain plants, whereas arms are present in both vertebrate and invertebrate animals.

• Tentacles are elongated structures, and the length is always higher in comparison to the arms.

• Arms of the invertebrates have suckers along the whole length, but the suckers are found at the tip of tentacles usually.

• In case of vertebrate arms, the fingers are very important features, while the suckers and nematocysts are the stand out features of tentacles.

• The tentacles of snails and slugs have chemosensory glands, but not in any type of arms do those feelings.

• Arms can perform finer and nicer workouts compared to tentacles.

• The tentacles mainly used to catch the pray, and the arms active secondarily and assist to gasp the prey in invertebrates.