Triops already lived 220 million years ago and are thus the oldest still living animal species

The finished triops

External limbs:


Skull plate (carapace)

Very striking In the Triops is the large Chitin - Panzer, which in some species like the Triops cancriformis can make up more than half of the body. In most other species, however, it is only about 1/3 of the body.

It protects against attacks and bumps and stabilizes the entire body of the triop.

Hull (tail)

The chitin also consists of chitin rings, which, like the skull plate, is quite resistant and protects the organs of the triopus.

Leaf pairs of legs

The rear pairs of legs are responsible for feeding the feed to the middle channel. The main task of these legs, however, is breathing. They are very strongly perfused and absorb oxygen from the water, just like in the gills of fish.

The anterior bones are larger than the posterior ones and contribute less to breathing than much more of the movement.


The two facet eyes are arranged in the shape of a coupling and thus enable a good view of the surroundings. However, with these eyes he can not very much recognize, probably only contours of her environment and brightness contrasts.

3. Eye

Between the two facet eyes there is also a third eye, which the triops have already since their first triops stage and one presumes that the triops can measure the pressure of the environment or light-dark contrasts.

Of these three eyes the Triops (Tri = three, Ops. = Eye) also has its name.

It is interesting, incidentally, that Triops only know by means of the irradiating light, where up and down is. I often observe when there is light in the room and the aquarium light is already off, the triops swim with the back to the light and look for the food in an oblique position.

Sensor (antenna arms)

With the probes, which can become quite long, the environment is examined for food by smelling with it and scrambling for obstacles.

Mouth tool

The mouth tool consists of several parts that serve to hold and chew the food. The middle channel feeds the feed to the mouth tool.

Fork tail

This is only responsible for the stabilization of the swimming movements and is not necessary for life. It is often also part of it trilops from other triops, which is however not further bad and to the next skinning back again.

Between the forks is the anus.

Egg sacs

After a few weeks, the triops grow, approximately in the middle of the body and below the tank of egg bags, with which an adult female 60 up to 200 eggs per day. Male animals, which are very rare, do not carry these egg-bags and are also recognizable.

Internal organs:

Do triops have a brain?

Jain, they have, as e.g. Cockroaches, which are also true survival artists, is only a central nervous system, which, however, condenses under the transition from the cranial plate to the trunk and, so to speak, forms a small brain.

In this way, they can retrieve complex instincts for hunting, in which they approach the supposed prey by carefully approaching them.

The nerve cords run near the abdominal area.

Do triops have kidney and heart?

Yes. Well protected under the tank is an organ, which is similar to a kidney. It regulates, as with us, the water and salt content. In addition, there is a simple structured heart. It looks like a thick hose and reaches almost to the end of the tank. The entire body cavity of the trunk is filled with blood, all the organs being washed. Veins, as we know it so does not exist.

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