Aerodraconidae

Aerodraconidae is the cliff-face glider lineage that pushed Thermosynapsida furthest away from the conservative subterranean body plan without immediately crossing into powered flight. Its defining ecology is vertical: cave mouths at different elevations, warm pulse-biased nests in uplifted karst, and repeated selection for controlled aerial movement between cliffs, ridges, and forest edges.

Claims

c0001 - Aerodraconidae originates in vertically structured cave systems where gliding immediately pays

The archive roots Aerodraconidae in cliff-face cave systems with multiple openings at different elevations and with geothermal pulses concentrated in high alcoves. In that setting even modest lateral membranes reduce the cost and danger of moving between cave mouths, making the first membrane-bearing morphs advantageous without requiring a fully open-surface lifestyle.

c0002 - Warm limb-bud pulses are linked to forelimb elongation and patagial expansion

The lineage's developmental mechanism is the same plasticity-first system introduced earlier in the archive: warm pulses during the limb-bud window bias embryos toward longer forelimbs and expanded lateral skin folds. Selection then stabilizes the variants most useful in vertical cliff habitats, progressively locking in the patagial body plan through cis-regulatory change near limb and membrane-development modules.

c0003 - Mature Aerodraconidae combine low armor mass with a true gliding membrane

The clade's diagnostic body form is elongate, lightly armored, and built around a gliding membrane running from wrist to ankle. Armor is reduced to modest dorsal elements, while orbit size, olfactory structures, and overall body streamlining shift toward aerial navigation and dusk-edge foraging rather than mechanoreceptive cave-wall life alone.

c0004 - Jurassic lock-in marks a long interval of stabilizing selection on the glider niche

Across the interval roughly 180 to 145 Ma, Aerodraconidae morphology becomes notably conservative relative to the broader order. The archive terms this the Jurassic lock-in: a period when the cliff-gliding solution appears close enough to local optimum that selection preserves patagial architecture while allowing secondary diversification in color, glands, and feeding behavior.

c0005 - Volucridraconidae splits from the extreme high-temperature end of the Aerodraconidae range

The archive places the Volucridraconidae split near the Jurassic-Cretaceous boundary, around 145 Ma, and derives it from light-framed Aerodraconidae populations exposed to stronger thermal variance in cliff-cave nests. At the hot extreme of the existing plastic spectrum, forelimb length, thoracic expansion, and membrane architecture cross from improved gliding into sustained powered flight, creating a new family-level body plan from inside the glider lineage.

c0006 - Aerodraconidae occupies a shorter torpor cycle than deep-cave Terradraconidae

The standard torpor model gives Aerodraconidae a shorter base unit than Terradraconidae and a macro-torpor rhythm shifted earlier by centuries. The archive attributes the difference to the more variable thermal regime of cliff-cave nests, which are exposed to seasonal and wind-driven fluctuations absent in the most stable deep geothermal systems.