[Recent Entries][Archive][Friends][User Info]
| October 22nd, 2011 | |
|---|---|
| 03:37 pm [industrialterro] [Link] |     Wodnika is an extinct genus of shark which lived in the Late Permian period in the present area of Germany and Russia. Wodnika striatula or the Zechstein shark is an extinct fossil shark, which lived 257million years ago during the Late Permian period. Wodnika lived in the Zechstein Sea which covered part of northern Europe at the time. Wodnika striatula is a rare shark first described in 1843 by Georg Graf zu Münster from only a partial specimen showing a dorsal fin spine and part of the fin. Usually only the teeth and spines of Wodnika (and most other fossil sharks) are preserved as fossils, but recently a the only known complete specimen was acquired by the Museum showing full details of the shark. The shark, which was discovered in Durham, is 240 million years old. Wodnika has only been found in rocks of the late Permian that were laid down in the Zechstein sea and seemed to have survived for only a short period of time (about 1.5 million years) before becoming extinct. Wodnika is similar to the hybodont sharks that flourished for many millions of years during the Mesozoic Era (250 to 70 million years ago), and may be related to them. It is thought that the hybodont sharks are the closest fossil relatives of the neoselachians (all living sharks and rays) (Maisey et al 2004).
Tags: Вымершие рыбы, Пермь, Хрящевые |
