
Creationists crave gaps in scientific knowledge as somewhere to relocate their ever-shrinking little god, but few of them would have been aware of this particular gap — and even if they had been, it lay inconveniently within that vast stretch of Earth’s history that occurred long before creationism’s deity allegedly created the small flat planet with a dome over it described in Genesis.
The gap concerned the fossil record of ichthyosaur evolution — those marine, dolphin-like reptiles that were apex predators in the Jurassic oceans. The gap-filling specimen was recovered from cliffs near Golden Cap in Dorset, part of the ‘Jurassic Coast’.
It bridges the interval between the extinction of earlier ichthyosaur families and the emergence of later ones. Further compounding the embarrassment for creationists, it represents a genuinely transitional species, displaying a mosaic of primitive and derived features.
The new find — one of the most complete ichthyosaurs ever discovered — is described in a paper by Dean R. Lomax of Bristol University and honorary research fellow at Manchester University, Judy A. Massare of the State University of New York at Brockport, and Erin E. Maxwell of the State Museum of Natural History, Stuttgart, Germany, published in Papers in Palaeontology.
An additional difficulty for Intelligent Design advocates is that, like other secondarily marine vertebrates such as dolphins, turtles, seals and other cetaceans, ichthyosaurs were constrained to return to the surface to breathe. Their respiratory system was inherited from their terrestrial tetrapod ancestors. Yet, according to creationist claims, their putative designer had already produced an efficient system for extracting oxygen from water using gills. There is therefore no obvious theological reason why that same designer could not have equipped marine reptiles with gills as well.
Evolution, of course, has no foresight and no capacity to redeploy complex anatomical systems wholesale from one distant lineage to another. It can only modify inherited structures, constrained by ancestry and developmental pathways.




































