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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
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'''Introduction'''
Sagan 4 is a planet with conditions similar to Earth. All of its life derives from a single cell, [[Protosagania]]. Its major kingdoms are [[Binucleida]], an incredibly diverse group in which each cell has two or more nuclei, ranging from microbes to the tallest trees, [[Carpozoa]], which tend to be fairly animal-like but include some single-celled and colonial species, and [[Photosagnia]], purple photosynthesizers that include clouds of microbes in the oceans and some of the first flora on land.
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 [[Scutivermida|knightworms]] (descendants of the [[Common Knightworm|common knightworm]]), which often resemble Earth's arthropods. They range from tiny crawlers to large creatures with legs, and they include two of the first fauna on land. They are mostly found around and on the western continent, Glicker. The next-biggest binucleid worm group is [[Heliovermis]] (descendants of [[Wormstem|wormstem]]), which are able to photosynthesize. They tend to have an animal-like juvenile phase and a plant-like adult phase. Heliovermes are mostly found on and around the eastern continent, Wright.
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.
The biggest Luceremundarian group is [[Geletaventria]], superficially similar to fish, but with a four-tentacled mouth. Some Geletaventrians are soft-bodied, while others have armor. Luceremundaria also includes [[Carpolantaia]], which are generally cup-shaped and gelatinous, mostly floating, though some are sessile or crawl.
Asterzoa is split into [[Asterzalia]], many of which have become bilateral swimmers and crawlers, including species with skeletons and formidable jaws, [[Asterstreidia]], radial species, mostly filter-feeders and mostly sessile, many of them shelled, and [[Asterfolia]], which have developed photosynthesis through symbiosis, some of which have become more plant-like and some with more active lifestyles.
There are several additional smaller kingdoms. One is [[Mancerxia]], which currently mostly consists of virus-like microbes. Another, [[Goliathpseudopodia]], consists of large single-celled organisms, some of which are over a centimeter in size. [[Lituswushia]], [[Skarlixia]], and [[Ferrumcarceria]] all metabolize various metals in different ways. The [[Taxonomy]] page contains a full list of Sagan 4's kingdoms.
'''Fun facts:'''
Life is recovering from a mass extinction involving a crash in oxygen levels and in bioavailable nitrogen.
The largest faunal organism ''currently'' is the [[Twilight Gill]] at 35cm long!▼
The largest floral organism ''
The large floral organism ''currently'' is a tie between the [[Crooked Cushio]] and [[Tallahassee Fringeweed]] at two meters tall.
The largest marine fauna ''ever'' was the [[Filter Chad]] at 12 m long.
▲The largest
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.
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'''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>
▲The largest floral organism ''currently'' is the [[Crystal Gazebo]] at 6m tall!
[[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:'''
This section is temporary until better front page navigation exists.
[[:Category:Species|Species]] - [[:Category:Extant|Living Species]] - [[:Category:Extinct|Extinct Species]] - [[:Category:Generations|Generations]]
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