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PousazPower — Primitive Tetrachordates

Published: 2008-01-27 03:52:25 +0000 UTC; Views: 1991; Favourites: 24; Downloads: 25
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Description A montage of primitive tetrachordates. Shown here are extinct and living protoradiichthyoids, loligopescids, tentaculopods, ankylotentaculids, and even a primitive tetrasteroid.

A. Watermelon squid, another reef-dwelling loligopescid. This species however, swims in small family "schools" communicating with each other via rasping sounds made by the undersides of their tentacles.

B. Pajama Sharksquid, a reef-dwelling loligopescid. This animal feeds by ramming its bony rostrum into the calcareous skeletons fleb colonies, sucking in the debris as it rains down, much like an alternative to a parrotfish.

C. Radiosalmo, an extinct protoradiichthyoid found in the rocks of Cornigog in Oshtailia.

D. Ballistichthys, another extinct protoradiichthyoid.

E. Vipersquid, a bioluminescent deep-sea tentaculopod. Because red is virtually invisible down there, so is teh vipersquid, save its lights.

F. Cookiecutter Squid, a semiparasitic species of loligopescid found throughout the world's oceans. Neither squids nor cookiecutters, these vicious little animals will latch themselves onto large pelagic animals, hanging on for a while and finally drop off, leaving nasty, bloody circular wounds that quickly attract zoxacans and other aquatic scavengers, which start to rip large chunks off of the still-living victim.

G. Digipampus, an ancient ankylotentaculid, showing elongation and segmentation of the three most distal tentacular vertebral beads, but no fusion.

H. Aspasteroides, an extremely primitive tetrachordate from the Quipsian period, 700 million years ago. Similarities in many anatomical features led Gossibiologists to believe that the tetrachordates and the chaetopodophorans diverged from a common ancestor. This genus, with its degenerate sea platter-style armor, has strengthened that opinion.

I. Tigerlily, a predatory pelagic tentaculopod found in the south Bunaan and Goryagod Oceans, snapping up small prey like an evil jet-propelled barracuda with a good decorator.

J. Ramsaw, a reef-dwelling ambush predator, this species anchors itself in its burrow with its claws, shooting itself out at passing prey and stunning it with its head casque. Who needs morays?

K. Missilocanthus, yet another extinct protoradiichthyoid (they're all actually extinct), found in central Quellaka.
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Comments: 5

Saxophlutist [2008-01-27 19:06:05 +0000 UTC]

I like the Aspasteroides!
They looks similar to echinoderms. The colouring is very nice too!

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PousazPower In reply to Saxophlutist [2008-01-27 21:02:08 +0000 UTC]

That's exactly what I was trying to get at. They are very closely related to the chaetopodophorans, which are basically glorified echinoderms.

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Saxophlutist In reply to PousazPower [2008-01-27 22:06:30 +0000 UTC]

Haha! Good ol' echinoderms! So the are your be-nerve-chorded organisms related to the radial organisms in the same way that Chordates have the Tunicates (Sea Squirts), acorn worms ect?

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PousazPower In reply to Saxophlutist [2008-01-27 22:43:38 +0000 UTC]

Exactly. Aspasteroides is like pikaia to you and me. I was also getting at teh fact that chordates on earth are also distantly related to echinoderms.

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Saxophlutist In reply to PousazPower [2008-01-28 00:20:34 +0000 UTC]

Oh, yes, and that too! Except more distantly related than your creature are to their radial brethren.

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