The Early Therocene: 30 Million Years Post-establishment

The Early Therocene: 30 million years post-establishment

The Early Therocene: 30 Million Years Post-establishment

Where The Buffalomys Roam: The Mison

The largest land animals of the Early Therocene are the giant, herbivorous descendants of the cavybaras, known as the mison. One of the most successful megafaunal herbivores of this age, they are represented by several dozen species in five genera, and are found in various biomes of the continents of Nodera, Westerna and Ecatoria.

The mison first emerged at the end of the Late Rodentocene, having evolved from the still-extant alpine cavybaras (Pilosocricetus spp.) native to the continent of Westerna. A lowering of the sea levels during a short period of glaciation at the end of the Rodentocene exposed land bridges from the shallow seas and allowed the mison to migrate west to Nodera and south to Ecatoria, where they became isolated once the sea levels rose and eventually evolved into different species.

Today, the mison are among the most abundant grazers throughout the plains across all three continents, and also the biggest. Weighing up to two thousand pounds and standing six feet as the shoulder, they are the biggest hamsters of this age, far outclassing their cavybara ancestors and rivalling the biggest rodent ever to live on Earth, the prehistoric giant pacarana, Josephoartegesia monesi. Their enormous size leaves them nigh-invulnerable to predators once they are fully grown, by sheer virtue of being so big.

The bearded mison of Westerna (Bovitauromys spp.) is the most basal genus, native to the cold plateaus of the Westernan continent where the mison first originated. Their Noderan cousins, the plains mison (Buffalomys spp.) and the savannah mison (Bisonomimus spp.) are adapted to warmer climates, with the plains mison being a resident of relatively warmer temperate plains, and the savannah mison being far less shaggy than its cold-clime relatives, as well as sporting a distinctly shorter and blockier head, as an adaptation for stronger jaw muscles to masticate the tough succulents of the dry semidesert.

The Early Therocene: 30 Million Years Post-establishment

In the southern continent of Ecatoria, however, live a distinct lineage of mison, which sport an unusual adaptation: a pair of tusks. All mison species possess molars that, much like their incisors, have evolved to grow constantly, allowing them to cope with the constant wear and tear of grinding tough woody vegetation. This branch of the mison family tree, however, modified their first upper molars into a pair of prominent protruding tusks, as while their sheer size was protection enough from fearret predators in Nodera and Westerna, in the continent of Ecatoria the mison had a different, endemic carnivore to worry about: the hamyenas.

The steppe tusked mison (Ceratodontomys spp.) sport small straight tusks, which serve to dig up ground plants and defend themselves from predatory hamyenas with jabbing thrusts of their massive heads. The southern tusked mison (Megaloceratodon spp.), on the other hand sport enormous, curving tusks, which it uses to sweep aside snow, fend off predators, and compete with other males- while both sexes sport tusks, they are markedly bigger in the males, which they use to joust with rivals over territory and mates.

All species of mison are grazers, specializing to feed on low-growing vegetation such as grasses, bushes and shrubs. Their immense sizes and tendency to travel in large herds numbering in the hundreds make them important ecosystem engineers, grazing through tough, thorny vegetation and promoting the growth of other plants that other herbivores, such as boingos and hamtelopes, rely on for food.

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More Posts from Enbylvania65000 and Others

4 years ago

Hebrew should be coloured blue here

Etymology For Chess In European Languages

Etymology for chess in European languages

2 years ago
Catcalling :3

Catcalling :3


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art
1 year ago

Hey remember when both TNG and DS9 had multiple episodes about how even if you've been at war with people for decades they're never a monolith and should not be indiscriminately hated and killed

Just a thought


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4 years ago

Lake Baikal is one of my top two nature tourism destinations, along with the Devil’s Throat in Yguasu /Iguazú/Iguaçu Falls.

Crystal clear ice of the frozen Baikal Lake

4 years ago

The Middle Rodentocene: 10 million years post-establishment

The Middle Rodentocene: 10 Million Years Post-establishment

Retro Rodents: The Furbils and Duskmice

By 10 million years PE the hamsters have diverged into many different forms, such as ungulate-like runners, mustelid-like predators or macropod-like hoppers. But while some of the resident rodents have further specialized away from the basic rodent body plan, two lineages, the furbils (family Caudatocricetidae) and the duskmice (family Cricetomuridae) are notable in having retained fairly conservative rodent anatomy, and are all the more successful for it: these two unassuming lineages have attained a diversity rivalling that of the jerryboas, and fill nondescript mouse, rat, hamster or gerbil niches all across the world.

The furbils, the more derived of the two lineages, are highly social creatures with long, tufted tails, displaying a very marked sexual dimorphism in many species, with dull, drab females and extravagantly-adorned males sporting striking markings and decorative tufts and manes of fur, which are used for display and attracting mates. Furbils tend to live in harems of several breeding females and one dominant male, while younger males are typically solitary and roam about searching for an opportunity to breed with any receptive females. Furbils are omnivores, feeding on insects, invertebrates, seeds, nuts and fruit, and males are known to attain their brilliant colors from pigments in their food: their colorful fur serving as an honest advertisement to their good health.

Male furbils are highly territorial, with the most brightly-colored and brilliantly-patterned males being the ones most attractive to females. This same coloration makes them more conspicuous to predators, as an unfortunate side effect: however, the fact that it gets them a higher chance to breed nonetheless allows them to more effectively spread their genes at the cost of individual longevity-- and in addition, essentially shows off their fitness by advertising an intentional handicap: a male that survives to breeding age even with such visible colors must be a very fit individual indeed, as far as females are concerned.

The Middle Rodentocene: 10 Million Years Post-establishment

The most distinctive furbil characteristic of all is their long tail, which depending on the species serves a wide array of functions: for display, social signaling, or balance. One lineage of furbils, however, the subfamily Caudotomae, have a different, more drastic use of their tails: as a defensive measure used to divert predator attacks.

The Caudatomae are unusual among their furbil kin as they are solitary and come together only to mate, and as such lack the marked sexual dimorphism of their cousins. They have instead opted their tail into a lure, with the tuft at the end serving to draw predator attacks away from their body and head. Usually this is only meant to distract the predator and allow the furbil to escape: however, should the tail be caught, the furbil can actually detach it completely and flee from danger, as a special joint at the tail's base allows it to break off with little injury when sufficient force is applied. Unlike lizards who use a similar tactic, however, the tail-dropping is a one-time trick in the animal's whole lifetime, as it does not regrow once shed-- as such, it is a costly sacrifice that is only used as a last resort if no other means of escape is possible.

One very peculiar species, however, has compensated with the lack of mammalian regeneration with a downright absurd adaptation: multiple fracture points along the length of its tail. Known as the fuse-tailed dynamouse (Fragmacaudamys cabuum), it can fracture off its tail a maximum of up to three times, as its tail is comprised almost entirely of three very long and stiff vertebrae. Its reddish fur camouflages it well in Beta-twilight, the time when it is most active, but a conspicuous yellow tuft on the end of its tail serves as a predator distraction tool. If the tail breaks off at a joint the tail quickly heals the end of the stump and a new tuft of yellow hair soon grows around the injury, restoring the form and function to a now-shorter tail. Once a dynamouse has broken its tail three times, the tuft forms directly at the base of its rump, and while no longer to shed any more segments, can still serve as a distraction by making predators attack the wrong end and still giving the now-truncated dynamouse a fair chance to flee.

The Middle Rodentocene: 10 Million Years Post-establishment

Just as strange and diverse as the furbils are the even more basal duskmice, small, stocky short-tailed rodents that still very closely resemble their hamster ancestors. Duskmice are a diverse group numbering nearly a hundred species, most of which are nondescript mouse-like seed eaters that hoard food in burrows and emerge at night and sometimes at Beta-twilight to forage, avoiding the many diurnal predators active during the day.

Some duskmice, however, have taken off to unusual niches, to take advantage of food sources beyond the reach of other hamsters. One genus, the molemice (Subterramys spp.) have adapted into specialized burrowers, developing large clawed forepaws for shoveling away dirt and hairless flat noses to push loose soil aside. They tunnel underground in search for roots, tubers and worms, and rarely ever come to the surface unless disturbed or if their burrows are flooded by heavy rains.

Another duskmouse lineage, the pondrats (Aquacricetus spp.), have instead taken to the water to feed on aquatic invertebrates and water plants that occur in abundance in freshwater bodies such as lakes and streams. They are the first hamsters on HP-02017 to specialize to a water-dwelling lifestyle, and as such have utilized a very unusual part of their anatomy to thrive in wet habitats: their cheek pouches. Acting as both flotation device and air storage, they can contract specialized muscles in their cheeks to compress the air, allowing them to sink and dive, and when returning to the surface quickly reinflate their cheek pouches to rise quickly to the top. Due to this specialization the cheeks can no longer be used as a food storage, and the pondrats instead hold food in a new different set of pouches that open lower in their mouths, surfacing every now and then to feed on their haul while floating at the surface.

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And thus with the duskmice ends the list of diversity in the Middle Rodentocene, the peak of speciation in a world of the small and scurrying. Our next stop will be at the Late Rodentocene, 20 million years PE: a time of even more diversity, but one that heralds the end of an age-- and a new promise of even greater things to come.

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2 years ago
Technically True.

Technically true.

1 year ago

Western queer radicals: Here's how Israel's gay-friendly image is used to cover oppression of queer Palestinians.

Israeli queer radicals: Agreed! They also erase how we in Israel don't really have the same equality as in the West, or the systemic racism faced by queer Arabs within the Israeli LGBT community. We should work in solidarity to improve queer lives everywhere, here's a bunch of Israeli orgs that you can work with to pressure our government. We can end pinkwashing together!

Western queer radicals: Actually the best way to ensure queer liberation in Palestine is to promote Islamist terrorism.


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4 years ago

The Late Rodentocene: 20 million years post-establishment

The Late Rodentocene: 20 Million Years Post-establishment

Quick Before The Hamyenas Come: The Hamyenas

As larger and more specialized forms become more common in the Late Rodentocene, the diversity of predators has also become more populous. On most other continents, the ferrats become the dominant carnivores, but on the continent of Ecatoria, a different predator reigns supreme: the hamyenas.

Descended from the hammibals of the Middle Rodentocene, the hamyenas are the top predators of the continent, and have expanded into a great diversity to take full advantage of the wide array of biomes on the continent. Some smaller species such as the dwarf hamyena (Microcutamys minimus) thrive in the Great Ecatorian Desert, while others, such as the black bear-sized greater plains hamyena (Crocutacricetus magnus) make a living on the continent's open grassland, preying upon the large grazing jerryboas and hamtelopes that are abuntant in these regions.

Some hamyenas, however, have begun to diverge away from the stocky, short-limbed bodyplan, and taken on different carnivore niches available in Ecatoria: some, such as the maned biteyeena (Barognathomys shenzii) has developed a powerful jaw for cracking apart bones, often scavenging the leftovers of other hamyena species and chewing apart carcasses to get at the bits of meat inaccessible to other carnivores. Others, such as the fox-sized prairie zingo (Cynocricetus canioides) specialize on smaller prey, and thus have developed a much-more slender build, adapted for running and making fast turns in pursuit of its agile and elusive prey.

The Late Rodentocene: 20 Million Years Post-establishment

Like all rodents, the hamyenas lack canines: however, they compensate for the lack of these trademark killing tools with the help of highly-specialized jaws and teeth. The upper incisors, which grow continually as typical of rodent teeth, merge together into a single stabbing point that is kept well-ground and sharp by the whetstone-like lower incisors, which grind against the fused upper 'fang' and keep it in deadly shape.

Hamyenas are typically solitary ambush hunters, pouncing on their prey after stalking them at close range. Their jaws, which can open extremely wide up to an angle of 90 degrees, allows them to get their jaws over the necks of their victims and puncture the carotid arteries: once sufficient damage is done the prey quickly bleeds to death, making a safer and more efficient kill for the predator as opposed to a suffocating bite to the neck, which risks injury to them as the prey struggles for a prolonged period of time.

The larger species of zingoes, however, have discovered a new tactic of hunting: cooperation. Multiple individuals, usually a mated pair and their adult offspring, work together to take down larger prey, especially the browsing forest hamtelopes of the continent. These species are less agressive toward their own kind compared to other hamyenas, and adults stay and hunt with their parents and siblings until they eventually depart the pack to find new mates and territories of their own.

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2 years ago

“I tell the landscape where we’re going.”

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enbylvania65000 - Enbylvania 6-5000
Enbylvania 6-5000

queer, hiloni, conlanger; pronouns: they/she/he

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