Superterrestrial world with indigenous life

Image from Steve Bowers
Pentapods are land animals on Simurgh, about the size of a small cow; some species of pentapods have recently been provolved

Star YTS-11315-10014III
Type F5V
Distance from Sol 3084 ly
Constellation Circinus
Planet Simurgh
Type SuperGaian.
Mass 7.5x Earth
Diameter 20800 km (1.6 x Earth)
Surface Gravity 2.81 gees
Survey Commenced 7309 AT

Simurgh is a Superterrestrial Garden World with a relatively thick oxygen/nitrogen/carbon dioxide/helium atmosphere. The planet has active plate tectonics and many small plates. Oceans and seas are numerous but cover less than 50% of the surface; volcanic activity is commonplace and low mountain ranges cover much of the land surface.
Image from Steve Bowers
Simurgh is a supergaian world with a surface gravity nearly three times as great as Earth's
The seas are filled with diverse lifeforms, including many autotrophs and heterotrophs, often in symbiotic relationships or as part of colonial organisms. Since the seas are largely discontinuous, evolution has taken many paths. Land organisms are present, but are adapted to the relatively high gravity on this world in various ways.

Most land animals have at least five limbs, with at least one ventral proleg between the mainleg pairs. A common bodyplan is the pentapod, with four mainlegs and one central proleg; other species also have a foreleg or hindleg (or both) and often several more pairs of mainlegs. The largest land animals are the dinopillars, twenty metres long with twenty-two legs.

All animals have very fast reflexes because of the high gravity. Falling objects accelerate to terminal velocity very quickly on this world, and release a significant amount of energy when they hit the ground.

This world has been under continuous observation since 7309 when a team of Negentropist xenologists reached the system.

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Development Notes
Text by Steve Bowers
Initially published on 15 December 2011.