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Whipteeth crocodile arrowfish by Preradkor Whipteeth crocodile arrowfish by Preradkor
Arrowfishes are among the most common water aliens on planet Coatlicue. They moves using jet propulsion.

Yes, when i designed arrowfishes five years ago (as first Coatlicue aliens), I thought I was original. But I see that there is many jet aliens designed by other people... So treat it as a convergence between planets...

So arrowfishes moves using jet propulsion. They pump water trough enormus gill in the middle of their body (between back oil sacks and alimentary canal under gill). Gill is simmilar to two chamber heart. Arrowfish sucking water trough mouth into first (upper chamber), then it shrink and water wash to second chamber situated under first. Then second chamber shrink and pump water through tail nozzle. In the same time first chamber sucking water, because volume of whole gill can't change.
Gill is attached to alimentary canal. Most arrowfishes uses gill to suck food by mouth. When food hits filter net before gill, its pushed into chewing stomach. Then many calcium arsenate teeths grind it for small pieces. Arrowfish bowel isn't splitted for many tubes like cephalothoraxid's, but look quite simmilar to bowel of earth vertebrates. Together with gonads it opens in the tail nozzle.
Their skeleton is made from rings of rubber like protein. It has two layers. Internal which encloses gill, and external which is under skin.
They blood pumped by two hearth and working gill muscles is red, but not the same red like earth vertebrates blood. It is rather dark pink.
They eyes are spherical and very simmilar to eyes of earth vertebrates. They have good sight and probably even see colours.
Their skin looks simmilar to earth amphibians skin and they must moult from time to time loosing old epidermis in one piece like earth snakes do.

This one is Whipteeth crocodile arrowfish. Quite strange species. They are 2,5 meters long predators, hunting for smaller arrowfishes. Most arrowfishes have funnel shaped, sliding lips, which help them cath food. Lips of this species are splitted for two tentacles, and covered by many sharp calcium arsenate teeth very simmilar to their stomach teeth. They use them like crocodile jaws to catch and kill smaller arrowfishes before sucking them to stomach. But they have no real jaws. their "jaws" are boneless, soft, and moves like whips. But it is probably the most vertebrate like mouth on Coatlicue.
Crocodile arrowfishes have four stabilizers fins and few (Whipteeths have eight) stere fins around tail nozzle. Whipteeths are specjalized to fast swerve horizontaly (during chasing smaller arrowfishes), and their vertical fins are much more developed.
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Hunter12396 Featured By Owner Jun 8, 2012  Hobbyist Traditional Artist
cute but just so you know when blood is inside of an earth animal it is blue (usually) it turns red when it comes in contact with oxygen but good work
Preradkor Featured By Owner Jun 10, 2012  Hobbyist Traditional Artist
No, in earth vertebrates veins are blue, but blood inside is always red. It changes only shade from light to dark red, depends on how many oxygen it contains. Vertebrates (with only few exception of white blood, cold water fish) have hemoglobin in blood what is red. And blood inside veins also contains a lot of oxygen, what is taken from lungs.

Blue blood is blood what contains hemocyanin instead of hemoglobin and blood of this kind have many arthropods (but not insects) and mollusks. It is clearly visible in big species, like horseshoe crab.

But earth vertebrate blood is never blue, always red.
PeteriDish Featured By Owner Apr 23, 2012  Hobbyist General Artist
I love this! very alien-looking! well done!
nemo-ramjet Featured By Owner Oct 22, 2008
These are some of the most original alien designs I've ever seen!
Preradkor Featured By Owner Oct 22, 2008  Hobbyist Traditional Artist
Hehe, thanks. :-) But Snaiad is also very good alien project.
Rodlox Featured By Owner Sep 19, 2008
I like it. it's very original - particularly the mouthparts.
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Submitted on
August 14, 2008
Image Size
77.0 KB


60 (who?)

Camera Data

FinePix S6500fd
Shutter Speed
1/100 second
Focal Length
9 mm
ISO Speed
Date Taken
Aug 1, 2008, 11:39:54 PM