Just curious as to how others feel about the need for more diversity in the Traveller Universe in regard to new alien races.
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Of course not to suggest the sudden influx of 'immigrants' to make every starport seem like the casting call for extras to populate Mos Eisley, but known space is too big and broad to have only 'fielded' life as we know it.
My personal take is that I don't like too many naturally-evolved alien species; otherwise the campaign setting turns into Star Wars or what Star Trek became: The Alien of the Week. As far as diversity, I am all for naturally-evolved alien species being truly
ALIEN (i.e. I like life as we
don't know it

)
. In general though, I do not lean to the view of the Universe "teaming" with life, so to speak (at least, not teaming with
intelligent life, at any rate). But that is my personal leaning. YMMV.
What does surprise me though is there should be more intelligent saurian-based species plying the spaceways as well as non-hive mind insectoids or arachnids.
Actually, my feeling is that any naturally-evolved aliens (as much as possible) should not be modeled on
any of the Orders/Classes/Families of the Terran "Tree of Life". An alien biosphere would be
completely independent of Terran tropes. So if I were designing an alien species, I would try as much as possible to shy away from descriptions such as "Saurian" or "Insectoid" or "Arachnid", except in the most general terms. Those descriptors have to do with particular orders and classes of creatures that have Terran origins.
When drawing on Earth based life as inspiration, I try to make sure that I combine features from unrelated kinds of life, (e.g. just because it has scales does not mean it is a "reptile" - try to combine general ideas and concepts from "mammaloid" or "arthropoid" or "marsupial" or even plant or fungi {if possible} into the write-up).
When giving a general description, I might say that something is "mammaloid" or "arthropoid" (or even "pseudo-mammaloid" or "pseudo-arthropoid") in order to stress the fact that even though there are features that may resemble an arthropod or mammal, the are most certainly NOT arthropods or mammals).
One last thing, where are the water-breathers ? If oceans can be the dominant feature on so many planets that support life, such as our own, then why haven't we encountered intelligent Cephalopods and their amazing organically 'grown' living coral starships ?
This might actually be an issue that has to do with how a given environment facilitates or retards technological progress. Technological progression by its nature builds technology upon technology. While alternate advancement paths may exist toward a given technological goal, in general technology requires that certain given "prior technologies" be in existence before further progress can be made. A good basic example would be the control of fire, which is necessary for smelting and refining metals so that those metals can be put to technological use. And since certain technologies require the use of such metals, the failure to control fire may retard the technological progress of a given species.
This would be a difficult (though not insurmountable) challenge to a water-based life form. You would need to explain either how they came to control fire (possibly as a result of venturing onto land for some reason) , or as an alternative, invent an entirely alien technological path that is based on a radically different technological progression. Both are doable, but with varying degrees of challenge for the GM.