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[[
<big><big><big>Sagan 4</big></big></big>
Sagan 4 is an alien planet ecosystem project originally started by [[:User:Hydromancerx|Hydromancerx]] inspired by [http://video.google.com/videoplay?docid=433274581250541893&q=carl+sagan+evolution Carl Sagan's video]. Life on this alien planet started from a [[Protosagania|single-celled organism]]. It is now populated with many species of flora and fauna all created by [[:Category:Species_by_Creator|artists]] who love drawing and xenobiology. Submissions take place on the [http://sagan4.jcink.net/index.php?c=4 Sagan 4 Beta subforum] of the official Sagan 4 forum. We also have a [https://discord.gg/ZFYuVWh Discord server] which is open to members and spectators alike.
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Binucleida's two largest lineages originated from a symbiosis. One organism produced a chitinous outer shell, and another provided a soft inner core. One of these lines is the [[Mineraluitesta|crystal flora]], in which the outer shell is usually photosynthetic and crystal-shaped; these dominate many of Sagan 4's photosynthetic niches.
The other line of symbiotic Binucleida is the [[Symbiozoa|binucleid worms]], in which the outer shell forms a segmented exoskeleton. The biggest group of binucleid worms is the [[
Carpozoa's biggest lineages are [[Luceremundaria]], which often have colorful bioluminescence and range from fish-like to cup-shaped, and [[Asterzoa]], a diverse group whose original body plan was shaped like a four-armed star.
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'''Fun facts:'''
Life is recovering from a mass extinction involving a crash in oxygen levels and in bioavailable nitrogen.
The largest floral organism ''currently'' is the [[Greatest Crystal Fortress]] at 480 meters wide and 240 meters tall!▼
▲The largest floral organism ''
The
The largest
The largest marine fauna ''currently'' is the [[Ophaniroth]] at three meters long.
The largest land fauna ''ever'' was the [[Gigantaurok]], at 5.6 m tall.
The largest partially terrestrial fauna ''currently'' is the [[Lunger]] at two meters long.
The largest fully terrestrial fauna ''currently'' is a three-way tie between the [[Pallazor]], [[Inkblot Notback]], and [[Northern Notback]], at one meter long.
Life has spread across much of the planet, but deserts and montane areas are still relatively barren, as are cave and the deep underground water tables.
<div style='text-align: center;'>
'''Below is a random selection of extant species; click any one of them to learn more!'''
{{#dpl:category=Species|category=Extant|randomcount=16|format=,,<li style="display: inline-block; vertical-align: center;">[[File:²{show|SpeciesInfo|%PAGE%|image}²|thumb|150px|link=%PAGE%|[[%PAGE%]]]]</li>,}}<br><br>
For some per-category introductions, click one of the following :<br>
[[Introduction to Extant Fauna]] ● [[Introduction to Extant Flora]] ● [[Introduction to Extant Microbes]]<br>(note that they are a work in progress)</div>
'''Quick Category Links:'''
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