Winners and (late) losers

Geotters were devasted from the END: it's thought that 80% of the species of this clade died out in the first stage of the mass extinction event, without reaching the Cambiocene, primarily because of their high ranking in the trophic chain.
Only three species are known to have survived after the Lentocene, but even fewer were able to survive the conversion of endemic forests in fern thickets and the collapse of invertebrate biomass.
One of these late surviving geotters is the flame shader (Cuniculimustela ignifuga), the only species of marter species that survived the END. Like all marters, these small geotters possess extremely primordial characteristics and a semi-fossorial habit. Marters were very penalized during this mass extinction due to their overspecialized diet, but the flame shader was able to exceptionally survive in the Willowcoal Peninsula, where a small population of bellydruggers (their main prey) was able to survive. 

At the same time, this Green Refuge was home to another geotter, more precisely a wotter: the charcoal of the Thousands (Millilutra epiviviosas).
Slightly larger than its marter relative, its global population is thought to have reached a thousand individuals at its worst, but it quickly enlarged its range following the expansion of ground tyrants and, in a second moment, forests. Like all wotters, the charcoal of Thousand is extremely versatile, with a very plastic diet that comprises terrestrial and flying animals and plant matter.
With the restoration of their natural density, these wotters strongly impacted flame shaders, which were not able to recover quickly enough.
The already depleted bellydrugger population of Willowcoal Peninsula, now facing the predatory pressure of not one but two predators, went extinct shortly after, dragging with it the unlucky flame shaders.
The Cambiocene is the epoch of change, and the marter-to-wotter turnover will be one of the biggest changes that geotters will see in this short but intense epoch.