Quetzalcoatlus

Quetzalcoatlus would be incapable of flight with atmospheric densities as they are now.  This is another argument for a deeper Atmosphere and much higher gas densities and pressures here at the surface.   The gossip among aboriginals  is that tiny versions about 3' across still exist in South America.

Quetzalcoatlus - Google Search

Insect's maximum weight if Proportional to Atmospheric O2 Partial Pressures

>>>  Monster Bugs require a Monster Atmosphere

• Dalton’s Law of partial pressures

• Fick’s Law for diffusion of gases across the alveolar-capillary membrane.

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Meganeuropsis

Bugs like Meganeuropsis operated with an identical design to their impoverished relatives living today. 

The ability of a creature to grow to it's  maximum size is capped by some limiting factor.  Mammals have a gene to shut down their growth.  Reptiles do not. 

We are saying here a limiting factor is certainly the atmosphere's ability to meet a creature's reparatory oxygen demand.   Reptiles, unlike mammals have no gene to tell their bodies to stop growing for example.  So unlike mammals reptiles grow until some other limiting factor prevents them from growing further.  Giant humans - who by malfunction do not arrest their growth, typically develop an enlarged heart and die of heart failure because the heart and lungs - although enlarging also - are unable to transfer oxygen from the atmosphere to the enlarged mass of body tissue due to gigantism.

The respiratory system of an insect consists of simple pits in the sides of it's body which house the alveolar membrane through which the oxygen passes into it's body.  It cannot by "breathing heavily" increase the transfer rate of oxygen into it's body.  Fluttering it's wings likely helps, but basically, it has to stop moving  to "catch it's breath". 

Judging by the A/T term in Fick's Law, we are guessing that:

•  the oxygen transfer rate scales up directly with the fly's dimensions

• The fly's body tissue weight likely scales up as a cube of it's dimensions.

• the limiting dimensions due to asphyxiation of a dragonfly like Meganeuropsis increases therefore as a cube root of the the partial pressure of oxygen in the ambient atmosphere. 

• the atmospheric partial pressure of oxygen required to prevent a Meganeuropsis from asphyxiating therefore increases as a cube of the fly's dimensions.

• A Meganeuropsis with a wingspan of 28" - scaled up from living flies having wingspans of say 4" at a maximum - must have been living in an atmosphere with a partial pressure of oxygen of seven cubed times greater in density at the earth's surface.

This is all for a fly at rest of course.  The mechanics and difficulties of getting this much more bug into the air and fly is being completely ignored.  We can say that to the respiration rate and oxygen demand of a flying  Meganeuropsis  will NOT scale directly with the bug's dimensions.  To fly it's oxygen demand at greater weights must scale at something MUCH MORE than one.  We just don't know at this point what that scaling would require.     

Gigantism of Fossil Record, cw a Deeper, "Hyperbaric" Atmosphere 

Mammals have a gene which tells them when to stop growing.     Reptiles do not have this gene, and continue to grow all their lives.

• meganeuropsis - Google Search

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