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Description
I wanted to slightly change the concept of two-headed creatures. Both heads are complex organs that perform their functions:
The upper head is essentially a developed siphon. An unpaired respiratory opening is located at the end of the head, and a cloaca along with gonads is located under it. Simple eyes are also located on the siphon, allowing you to see.
The lower head is equipped with gustatory, tactile, and olfactory progenitors that allow one to find food. Inside the mouth there are many teeth and a radula for grinding various foods.
Legs do not come from fins, as in Terrestrial vertebrates, but from one unpaired leg. Their ancestors were shell-like creatures.
The internal skeleton comes from a segmented shell, but with it they have cartilage and special chamber vessels that function as muscles but also serve as a skeleton.
Tail - also comes from the unpaired leg.
The anatomy of different snayadi can vary greatly, as they have had to occupy almost all niches.
The circulatory system is not closed. Because of this, only very small species can maintain a sufficiently high level of metabolism and at the same time be quite hardy.

Description
I wanted to slightly change the concept of two-headed creatures. Both heads are complex organs that perform their functions:
The upper head is essentially a developed siphon. An unpaired respiratory opening is located at the end of the head, and a cloaca along with gonads is located under it. Simple eyes are also located on the siphon, allowing you to see.
The lower head is equipped with gustatory, tactile, and olfactory progenitors that allow one to find food. Inside the mouth there are many teeth and a radula for grinding various foods.
Legs do not come from fins, as in Terrestrial vertebrates, but from one unpaired leg. Their ancestors were shell-like creatures.
The internal skeleton comes from a segmented shell, but with it they have cartilage and special chamber vessels that function as muscles but also serve as a skeleton.
Tail - also comes from the unpaired leg.
The anatomy of different snayadi can vary greatly, as they have had to occupy almost all niches.
The circulatory system is not closed. Because of this, only very small species can maintain a sufficiently high level of metabolism and at the same time be quite hardy.