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Description
Detailed Skeletal descriptions

Here are the skeletal structures for Two of my Alien Organisms.
Note the non-vertebrate morphology.

Organism 1 (Top)
More info here: [link]

Figure 1: The carapace, filled with air pockets to help buoyancy.
Figure 2 The 'chest' plate.

Figure 3 The side view of the complete skeleton.

Organism (Bottom)
More info [link]
Figure 4: The side view of the skeleton, Skeleton is lightweight and evolutionary pressures caused these organisms to convergently evolve internal bone structure strikingly similar to birds, to maximize flight efficiency.
Streamlined shape from swimming ancestors aids in flight also.
Note: Limbs deleted for clarity.

Figure 5: The skeletal structure on the bottom, notice the keel like structure for flight muscles to attach to. Used to aide in respiration before these organisms evolve to take flight. The claspers, which were used to catch prey in aquatic settings, serve as anchors to solid surfaces, when available, including actual land mass or floating megafauna.
How developed these are depends on the individual species and how much solid surface is available.

Figure 6: The smallest limb, aids in gliding.

Figures 7 & 8: Used in flight primarily, aerofoiled shape for fight efficiency.

Description
Detailed Skeletal descriptions

Here are the skeletal structures for Two of my Alien Organisms.
Note the non-vertebrate morphology.

Organism 1 (Top)
More info here: [link]

Figure 1: The carapace, filled with air pockets to help buoyancy.
Figure 2 The 'chest' plate.

Figure 3 The side view of the complete skeleton.

Organism (Bottom)
More info [link]
Figure 4: The side view of the skeleton, Skeleton is lightweight and evolutionary pressures caused these organisms to convergently evolve internal bone structure strikingly similar to birds, to maximize flight efficiency.
Streamlined shape from swimming ancestors aids in flight also.
Note: Limbs deleted for clarity.

Figure 5: The skeletal structure on the bottom, notice the keel like structure for flight muscles to attach to. Used to aide in respiration before these organisms evolve to take flight. The claspers, which were used to catch prey in aquatic settings, serve as anchors to solid surfaces, when available, including actual land mass or floating megafauna.
How developed these are depends on the individual species and how much solid surface is available.

Figure 6: The smallest limb, aids in gliding.

Figures 7 & 8: Used in flight primarily, aerofoiled shape for fight efficiency.