Discovery of a Transitional in Romer's Gap
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Description: Article on the discovery in 2002 of a tetrapod fossil, Pederpes finneyae, which seems to fill the gap between the very earliest and later tetrapods.
Pederpes finneyae - transitional from Romer's gap Discovery of a Transitional in Romer's Gap The oldest known tetrapods (vertebrate animals with four limbs, such as amphibians, reptiles, birds, and mammals) are Icthyostega, Tulerpeton and Acanthostega dated from the late Devonian about 365My ago. They appear to be primarily aquatic. At the beginning of the Upper Carboniferous, at 335My ago, several groups appear in the record including temnospondyls and anthracosaurs (which have amphibian features), six groups of lepospondyls which superficially resemble snakes, salamanders and lizards, and a precursor to the amniotes (which is the lineage from which modern reptiles, dinosaurs, birds and mammals ultimately derived). Between 335My ago and 365My ago, no tetrapod fossils have so far been found, so the derivation of the multiple lineages in the Upper Carboniferous from the early primitive tetrapods in the late Devonian is something of a mystery. It is known as Romer's Gap, and it is mysterious because the fossils on the older side of the gap (late Devonian) bear little direct resemblance to those on the more recent side (Lower to Upper Carboniferous transition). For a very detailed discussion of the evolution of tetrapods, see Jennifer Clack's superb book,
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| Page title: | Pederpes finneyae - transitional from Romer's gap |
| Keywords: | Essays, Evolution, Refutations, Creationism, Pederpes finneyae, Romer's gap, transitional |
| Description: | Discovery of a Transitional tetrapod in Romer's Gap, Perderpes finneyae |
| IP-address: | 95.142.159.11 |
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| Date | Creation Date: 04-mar-2003 Expiration Date: 04-mar-2014 |