I am reminded of the 1986 cartoon series "Galaxy Rangers", wherein the insects and spiders that hitched a lift aboard colonial transports to Mars developed into gigantic, dog-sized animals, several of which were domesticated as pets.
A similar development occurred in "Doctor Who" on the planet Metebilis III, where a peculiar form of radiation from Metebilis crystals caused the spiders to evolve into sentient, man-sized Arachnids that enslaved the original Human colonists.
I'm assuming that the atmosphere of mars has been restored to a tolerable level for organisms to utilize. But I have one question, do spiders breathe through trachial tubes like most insects do? Or have they evolved past that need due to size increase, and now breathe through a nose, mouth or something similar?
If you solved the molting problem, a more efficient respiration system may evolve - perhaps in the shape of a fluid-filled chamber encasing the gill/trachea with some sort of "diffuser" to pump air into it.
Haha, thanks for liking them! They are actually not that bad, the biggest one would be the size of a gazelle or something. When something is that size, it doesn't seem all "spidery," at least not to me
Oh. My. Darwin. It is one of the best work of art and story you'll ever seen! I can explain forever, but to give a short version here:†It tells the story of Nausicaš, a princess of small kingdom that is pulled into a war between mighty empires as a looming environmental apocalypse threatens the very survival of humankind. On her journey she seeks to find peaceful coexistence between the nations of men, as well as between man and nature.†
What happen is that a man-made mass extinction refer to as the "Seven Days of Fire" had wiped out basically 94% of all life on Earth. This include the vast majority of mammals, birds and plants. However arthropods and fungi fill in the void and evolved an incredible diversity: Sapient woodloce twice the size of titanosaurs, predatory wasps that look more like raptors with the attitude too, mold that acts like a virus and fungi the size of redwood. Basically arthropods are "neovertebrates" and fungi "neoangiosperms" and the environment produces spores that will kill humans in a second. Basically it's the original Pandora of Avatar. Only better (in addition there are also dromornithids and cattle that really look like horned mesonychians as beast of burden; Also a shit load of humaniods that were genetically created which look something from your All Tommorows 0.0)
Are you drooling yet? If so good, cuz it's a speculative zoologist dream! And I would love to see your wicked designs on these species. If you type in "Nausicaa insects" or "Ohmu" you will be amazed. And this critter, the spider, would fit right in. ††
There are two versions: the original manga (graphic novel) and the movie. Both really great, written and created by the same genius (Hayao Miyazaki). However the movie version is based on a fraction of the novel's saga (it is more jucier and better, explains more of the ecology than the movie does. But it may be easier on your part to look for the movie version instead).
You know what I'd love to see come from you - Macroscopic Tardigrades.
Maybe as some sort of habitat experimentation, human scientists produce macroscopic tardigrades and set them loose on Mars - several millennia pass Mars is dominated by all sorts of Water-Bears ... or Earth has rotted due to massive nuclear fallout, the hardy tardigrades are the next progenitors of Earth...