How slowpoke drepanosaurs split from speedy tiny tanystropheids
Both were derived from Palaegama,
(Fig 1) a long-legged,?30-cm basal lepidosaur from the Late Permian.
Huehuecuetzpalli (Fig 1) led the speedy clade.
Jesariosaurus (Fig 1) led the slow clade.
Note the differences in limb length vs torso length already in place.
Speedy tiny tanystropheids
evolved to become show-offs, developing various extra dermal membranes including oversize dorsal frills.
Then some {= fenestrasaurs] started flapping from locking down and elongating the coracoid.
Then some [= pterosaurs] started flying by elongating the fourth finger.
Slowpoke drepanosaurs
evolved to become even slower. Some anchored themselves to tree branches (Fig 1), perhaps becoming immobile, perhaps hoping to be invisible.
That’s the opposite of the speedy show-off clade. Keep that in mind.
In 2025 Spiekman et al reported
that the exotically frilled show-offs Mirasaura (Fig 2) and Longisquama (Fig 1) were slow-moving drepanosaurs.
That doesn’t make sense given the above trends.
Treat Spiekman et al kindly. Scientists are allowed to make mistakes. That’s the scientific method. However, after awhile they should acknowledge those mistakes and correct them.
Still waiting for that to happen.
References
Spiekman SNF et al (12 co-authors) 2025. Triassic diapsid shows early diversification of skin apprendages in reptiles. Nature https://doi.org/10.1038/s41586-025-09167-9
Source: https://pterosaurheresies.wordpress.com/2026/11/02/how-slowpoke-drepanosaurs-split-from-speedy-tiny-tanystropheids/
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