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Description
Anatomy:

A - inhalation pore
B - first heart
C - respiratory muscle
D - gill
E - ventral "scale"
F - layer of skin
G - gill pouch
H - exhalation pore
I - reproductive organs
J - incomplete gut
K - stomach
L - mouth/anus
M - fin
N - second heart
O - atrery
P - vein
Q - kidney
R - dorsal "scale"
S - axial nerve
T - ganglium

The anatomy is labelled, so there is not much to talk about, other than that the hearts. One of them propells the blood from the body into the gill pouch and the other one forces it from the gill piuch into the body.

It has only an incomplete gut, so the waste has to go through the same hole the food went inside.

It has a single inhalation pore, a single "gill pouch" and three exhalation pores. The gill pouch will have use in propulsion, the exiting water will propell the animal forwards.

This animal is the same for the animals on Beta Colibri as Pikaia was for animals on earth, because it'll give rise to "vertebrates".

The animal still has no true bones, but the "scales" are what will give rise to limb girdles and backbone eventually.

I see the exhalation pores should have been done in a more streamlined fashion, but that's only a minor detail, the purpose of this was putting the general idea on paper, so I still call it successful.

The next in line will be "Aradulata", meaning "without radulae."

They will be similar in shape, but bigger,

they'll have well-developped eyes,

paired gill pouch,

six exhalation pores instead of three,

the "ventral scales" will become "lateral scales" and will have fin-like projections for increased stability,

complete gut,

second stomach (called "maceration stomach" which will be full of tooth-like projections - this is where the radulae will come from in the future)

the mouth will still be in the aft, but it will have a beak which will be surrounded by three tentacles for grasping small prey - it was suggested to me by *disrhythmic (THANK YOU FOR THE IDEA!)
I first thought I will have to trash this idea entirely,

(but come on! vertebrate with tentacles! What is more alien than that!)

So I then decided to fit this feature to proto-vertebrates at least.

Cephalopods are happy to use them, so once there was jet propulsion in the equation...

It doesn't matter what is on the other end of the tentacles, does it? Tentacles are cool!

Description
Anatomy:

A - inhalation pore
B - first heart
C - respiratory muscle
D - gill
E - ventral "scale"
F - layer of skin
G - gill pouch
H - exhalation pore
I - reproductive organs
J - incomplete gut
K - stomach
L - mouth/anus
M - fin
N - second heart
O - atrery
P - vein
Q - kidney
R - dorsal "scale"
S - axial nerve
T - ganglium

The anatomy is labelled, so there is not much to talk about, other than that the hearts. One of them propells the blood from the body into the gill pouch and the other one forces it from the gill piuch into the body.

It has only an incomplete gut, so the waste has to go through the same hole the food went inside.

It has a single inhalation pore, a single "gill pouch" and three exhalation pores. The gill pouch will have use in propulsion, the exiting water will propell the animal forwards.

This animal is the same for the animals on Beta Colibri as Pikaia was for animals on earth, because it'll give rise to "vertebrates".

The animal still has no true bones, but the "scales" are what will give rise to limb girdles and backbone eventually.

I see the exhalation pores should have been done in a more streamlined fashion, but that's only a minor detail, the purpose of this was putting the general idea on paper, so I still call it successful.

The next in line will be "Aradulata", meaning "without radulae."

They will be similar in shape, but bigger,

they'll have well-developped eyes,

paired gill pouch,

six exhalation pores instead of three,

the "ventral scales" will become "lateral scales" and will have fin-like projections for increased stability,

complete gut,

second stomach (called "maceration stomach" which will be full of tooth-like projections - this is where the radulae will come from in the future)

the mouth will still be in the aft, but it will have a beak which will be surrounded by three tentacles for grasping small prey - it was suggested to me by *disrhythmic (THANK YOU FOR THE IDEA!)
I first thought I will have to trash this idea entirely,

(but come on! vertebrate with tentacles! What is more alien than that!)

So I then decided to fit this feature to proto-vertebrates at least.

Cephalopods are happy to use them, so once there was jet propulsion in the equation...

It doesn't matter what is on the other end of the tentacles, does it? Tentacles are cool!