| Cheirothrix lewisii | |
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| A fossil fish in the genus Cheirothrix | |
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| Species: | † C. lewisii |
| Binomial name | |
| Cheirothrix lewisii Davis, 1887 | |
Cheirothrix lewisii is a species of prehistoric flying ray-finned fish that is included in the order Alepisauriformes, all the members of which are extinct. It dates back to the Late Cretaceous and its fossilised remains were found in fish-rich fossil deposits in Lebanon.
The fossilised remains of Cheirothrix lewisii were found in limestone strata in Lebanon dating back about 99 million years. This fish was first described by James William Davis in 1887 and was named in honour of Professor E. R. Lewis of the American College in Beirut. [1] Professor Lewis had originally found the fossil at Sahel Alma on Mount Lebanon. In this famous fossil location, about sixty species of fish have been found, none of them known from elsewhere in the world. [2] Cheirothrix lewisii is characterized by enormous pectoral fins and the ventral lobe of the tail fin is also much enlarged. It seems likely that these fish could launch themselves out of the water and glide hundreds of metres (yards) through the air, probably to evade predators. [1]
During the Cretaceous era, sea levels were much higher than they are now. The fish remains at Sahel Alma are very well preserved. The rock is a fine-grained limestone found in an area much folded and faulted and is laid down in thick beds. The fish may have died because of a localized shortage of oxygen. [3] Five specimens of Cheirothrix lewisii were found, each preserved in such detail that the fifty or so vertebrae can be counted [4] and the branching rays of the pectoral fins can be seen clearly. The holotype is a cleft slab of limestone with remains of the fish on both sides. It is now kept in the Natural History Museum in London. [1]
Another member of the genus, Cheirothrix libanicus, is found in the same fossil bed and other members of the genus are known from 84-million-year-old deposits in Germany. [1]
Dorset is a county in South West England on the English Channel coast. Covering an area of 2,653 square kilometres (1,024 sq mi); it borders Devon to the west, Somerset to the north-west, Wiltshire to the north-east, and Hampshire to the east. The great variation in its landscape owes much to the underlying geology which includes an almost unbroken sequence of rocks from 200 Ma to 40 Ma and superficial deposits from 2 Ma to the present. In general the oldest rocks appear in the far west of the county, with the most recent (Eocene) in the far east. Jurassic rocks also underlie the Blackmore Vale and comprise much of the coastal cliff in the west and south of the county; and although younger Cretaceous rocks crown some of the highpoints in the west, they are mainly to be found in the centre and east of the county.
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Cheirothrix is an extinct genus of ray-finned fish.
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