2 Million Years Henceforth
Polarcardiva
Polarcardiva
Polarcardiva could be considered a supercontinent, or a complex of continents arranged in a column. It stretches from the subtropical South to the polar North, and it's two extremes are separated by the hot equatorial dead zone, where temperatures can reach too high for photosynthesis to take place. Extremophile microbes colonising the empty space in soil and also the soil surface take the place of plants there, and they only make little more than a biofilm or mat on the surfaces, dry and crispy from the heat most of the time and waiting for the next rain.
Polarcardiva has a lot of coastline relative to area due to the scattered distribution of it's continents. At habitable climates it's home to the most coconut species compared with the dividing Catland continents relative to area. The most striking difference between The East and West Catland continents and Polarcardiva, is that Polarcardiva has no mammals or birds. This includes cats. The lizards were seeded long before the arrival of cats, rabbits, sparrows, and mice to the planet. Those mammals were only seeded on West Catland, and the cats migrated to East Catland before it finally split from the Western continent, and nowhere else.
Polarcardiva's largest and only terrestrial vertebrates are lizards. After 2 million years of evolution they have become varied in their sizes and niches. Some are much larger than their today-modern ancestor, but none much more than 1 metre in length. On this page are just a few examples of the diversity of these lands.
Leaping burnties are descendants of the burnt brick lizard. There are many species of leaping burntie, all with the common trait of being able to jump forward considerably high and far (for a lizard) in a single hop, as a means of escaping sudden ambush by a predator. While they can leap several times their own body length, their landings are not particularly graceful. They are usually insectivores, but some are also scavengers or predators to smaller lizards. Most leaping burnties live in semi-arid rocky places where they hunt basking insects and seek refuge atop high rocks from exposure to predators. Some live near by water, leaping into the water when spooked, and are decent swimmers.
The South Cardiva Islands make up part of a volcanic arc, and are an area of active land growth. The hotter, drier uppermost South Cardiva islands just below mainland Cardiva are conjoined into larger landmasses like a miniature continent, the consequence of a past period of extreme volcanic activity millions of years before the seeding of Earth life that formed great flats of new land. Here deserts prevail, and lusher habitat, even grassland is comparatively rare. Coastal climate habitats are the greenest areas of these large islands, while inland is at it's worst barren and arid.
Three lizards in a grassland: Purselip lizards are omnivores, starting their lives on invertebrates but eating increasingly more plant matter throughout life. Their name highlights a common characteristic of the tip of the upper jaw up folding over the lower one. This allows them to pull on vegetation to pluck it, using the rim of their upper lip as leverage, instead of it's small sharp peg-like teeth ripping right through it. Shown above in beige, this individual feels threatened by the unfamiliar stranger strolling by, and is pushing all of it's weight off the ground to look bigger, as well as showing it's gaping mouth as a threatening defence.
Ash Lurkers are a wide group of lizards that don't always necessarily live in ashy environments but most often do, and always employ some form of ambush hunting. This dark grey ash lurker is not interested in the purselip lizard. As prey, this big old purselip is just a bit too large and heavy to subdue, and there is no advantage of stealth for the ash lurker in this scenario. It's hardly bothered at all by the purselip lizard's display.
Half-emerged from a burrow under a rock, beneath a fallen date palm leaf is a rake-foot lizard. The toes on it's forelimbs are stiffer than those of other lizards and slightly curved, as well as sheathed in a durable claw that envelops the tips of the toes. The forelimbs are short but strong for digging. They spend a considerable amount of time underground, but are occasionally seen foraging above ground at night. They don't tolerate heat as well as other lizards in the region and don't go out during the day if possible. Most of their energy is spent on digging and foraging, which generates excess heat, which is often the cause of the need to rest. They prefer a low metabolic rate and mild temperatures. While digging is necessary to find food and expand their underground safe-space, in an established tunnel circuit they can wander the tunnels and forage on invertebrates that pass through without having to dig much more.
What has been shown so far is only the beginning. While the seeding organisms have diversified into countless new species (too many to describe) they are still only slightly different versions of the original seeding species. Over the next several million years stranger forms will develop. Their ancestry will become less visually obvious as they take unique, unrecognizable paths.
As East and West Catland continue to increase in distance apart, the cats and other animals they share this new world with will continue to change and become increasingly different from each other. The equator will remain inhospitable except at very high elevations, and this will be the normal state of this world for the foreseeable future.
The world of cats is not just a world of cats. Many other lifeforms have evolved amongst them, and in the places where they're absent. While it may have started comparatively few in species, the number of species is increasing rapidly on a path to match the diversity of Earth before the most recent mass extinction. In all respects the planet looks set to support life for many millions of years yet, and life shows no signs of stopping.