Does the seahorse have feet? The seahorse is an animal that lives mainly in the marine environment. Although seahorses belong to fish in general, their appearance is not like fish, and some structures are very special. In the process of observing them, we will find that there is a leg-like or feet-like structure in the lowest part of the seahorse body, and some people will also call the seahorse a foot animal. But in fact, this structure is not a foot, at least not our general definition of the foot. This foot-like structure is actually formed when the spinal column of the hippocampus bends and can be used to hook things. Although seahorses swim in a standing position, they do not use their feet to move, but their fins.
As mentioned above, the seahorse belongs to a fish. If it is more specific, the hippocampus belongs to the class of bony fish, that is to say, the hippocampus is a kind of bony fish. Bony fish have kidneys, but their kidneys are relatively primitive and can be called mesonephros. Compared with the kidneys of human beings and other higher animals, the kidney structure of teleost fish is not so complex, so the kidney of human beings and other animals has cortex and medulla, but the kidney of teleost fish does not have cortex and medulla.
In addition, the bony fish living in the sea and the bony fish living in the freshwater environment are different. Fish living in the sea live in a high salinity environment, and the water loss in the body is more serious. In order to maintain the balance of osmotic pressure in the body, the kidneys are generally relatively simple, and some even degenerate seriously. Seahorses are bony fish that live in the sea, so their kidneys are simple and even vestigial.
