Oh hai, can I chime in?
I realize you haven't started to add the relief yet, but from what I see, that equatorial continent will be covered by jungle. Massive, diverse and wild jungle (if there are high mountains/swamps, it would be also be unpenetrable. There would be some rainshadows, like Atacama and the Puna though...). Keep that in mind: we are talking like, four Amazons here? The diversity of life would be unparalleled on Earth.
Also, the event that created the continent would have inevitably have caused a mass extinction like the Permian-Triassic one, and thus changed the history of life on this planet. Of course, by this point, life will have recovered.
I offer my services as a partial-not-quite-yet biologist if anyone wants cool/realistic ideas for life on this planet.