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| Content Provider | Springer Nature Link |
|---|---|
| Author | Baliński, Andrzej Sun, Yuanlin Dzik, Jerzy |
| Copyright Year | 2013 |
| Abstract | A fossil of a colonial organism with pyritized soft tissues of elongated fusiform zooids, found in the middle part of the early Floian Fenxiang Formation in Hubei Province of China, probably represents the oldest reliable record of a hydroid cnidarian. The preservation of the fossil is sufficiently different from that of associated carbonized skeletons of graptolites to exclude affinities with this group. The fossil is unlikely to be a bryozoan because of the mode of budding from proximal, not distal, parts of parent zooids, which is typical rather of hydroids. Although no thecae are preserved, the fossil, named Sinobryon elongatum gen. et sp. nov., is suggested to be a thecate hydroid, possibly related to the Haleciidae. The apparent presence of an advanced member of the thecaphoran Macrocolonia clade in strata 470 Ma old means that much of the hydroid (and cnidarian) diversification preceded the Middle Ordovician.Ein fossilisierter kolonialer Organismus mit pyritisierten Weichteilen aus dem mittleren Teil der Fenxiang Formation (frühes Floium, Hubei Formation, China) stellt wahrscheinlich den ältesten Vertreter der hydroiden Cnidaria dar. Die Erhaltung dieses mutmaßlichen Vertreters der Hydrozoa ist hinreichend verschieden von der kohligen Erhaltung dort ebenfalls vorkommender Graptolithen, um eine Zugehörigkeit zu dieser Gruppe auszuschließen. Das Fossil zeigt einen typisch hydroiden Knospungsmodus, der vom proximalen und nicht vom distalen Teil des Zooids erfolgt. Hierdurch unterscheidet es sich von Bryozoen. Obwohl Thecae nicht erhalten sind, wird vorgeschlagen, das Fossil mit dem Namen S. elongatum gen. et sp. nov. den thecaten Hydrozoen zuzurechnen. Es ist möglicherweise mit den Haleciidae verwandt. Die offenkundige Präsenz eines abgeleiteten Vertreters der Klade Macrocolonia (Thecata) vor 470 Mio a legt nahe, dass die wesentlichen stammesgeschichtlichen Aufspaltungen der Hydrozoa (und Cnidaria) bereits vor dem mittleren Ordovizium stattgefunden haben. |
| Starting Page | 1 |
| Ending Page | 10 |
| Page Count | 10 |
| File Format | |
| ISSN | 00310220 |
| Journal | Paläontologische Zeitschrift |
| Volume Number | 88 |
| Issue Number | 1 |
| e-ISSN | 18676812 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2013-05-11 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Hydrozoa Evolution Fossil China Ordovizium Paleontology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Paleontology |
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