| 词条 | Cycnorhamphus |
| 释义 |
|fossil_range = Late Jurassic, {{fossilrange|152}} |image = Cycnorhamphus suevicus.jpg |image_caption = Juvenile specimen |display_parents = 3 |genus = Cycnorhamphus |parent_authority = Seeley, 1870 |species = suevicus |authority = (Quenstedt, 1855) |synonyms =Pterodactylus suevicus Quenstedt, 1855 Pterodactylus württembergicus Meyer, 1855 Pterodactylus eurychirus Wagner, 1858 Gallodactylus canjuersensis Fabre, 1974 }} Cycnorhamphus (meaning "swan beak") is a genus of ctenchasmatoid pterodactyloid pterosaur from the Late Jurassic of France and Germany.[1] It is probably synonymous with the genus Gallodactylus. DescriptionCycnorhamphus had historically been assumed to have had long jaws with teeth at the very tip, akin to those of Pterodactylus antiquus. However, recent work on a specimen nicknamed "The Painten Pelican"[2] has revealed that the animal possesses a very unusual jaw anatomy, with peg-like teeth at the jaw tips - blunter and stouter in older individuals -, jaw curvatures behind said teeth that form angled arcs away from the biting surface, forming thus an opening, and two poorly understood soft tissue structures occupying this opening from the upper jaw, showing mineralisation. The purpose of these adaptations is unknown,[3] but they are more obvious and well developed in adult animals. It has been speculated that the jaws functioned similar to those of openbill storks, allowing the animal to hold hard invertebrates like mollusks and either crush or bisect them.[4]History and classificationIn 1855 a fossil in a plate of shale from the Tithonian, found near Nusplingen in Württemberg, holotype GPIT "Orig. Quenstedt 1855, Taf. 1", was named Pterodactylus suevicus by Friedrich August Quenstedt.[5] In 1870 Harry Govier Seeley assigned it to a new genus: Cycnorhamphus. In 1907 however, Felix Plieninger rejected this split, an opinion then shared by most paleontologists. In 1974 Jacques Fabre, when concluding that a new species found and named by him, Gallodactylus canjuersensis, was the same genus as P. suevicus, did not revive Cycnorhamphus, but judged that the latter name was unavailable because of mistakes in the diagnosis by Seeley. P. suevicus thus became Gallodactylus suevicus. However, in 1996 Christopher Bennett pointed out that such mistakes do not invalidate a name and that therefore Cycnorhamphus has priority, making Gallodactylus canjuersensis C. canjuersensis.[5] In 2010 and 2012, Bennett published further re-studies of the fossils, concluding that the differences between the two species could be explained by age, sex or individual variation, and formally synonymized C. canjuersensis and C. suevicus.[6] See also{{Portal|Paleontology}}
References1. ^{{cite book |last=Unwin |first=David M. |authorlink=David M. Unwin |title=The Pterosaurs: From Deep Time |year=2006 |publisher=Pi Press |location=New York |isbn=0-13-146308-X |page=272}} {{Taxonbar|from=Q2688563}}{{pterosaur-stub}}{{Jurassic-reptile-stub}}2. ^Bennett (2013) 3. ^Frey and Tischlinger (2010) 4. ^Witton, Mark P. (2013), Pterosaurs: Natural History, Evolution, Anatomy 5. ^1 {{cite journal |last=Bennett |first=S. Christopher |authorlink=S. Christopher Bennett |year=1996 |title=On the taxonomic status of Cycnorhamphus and Gallodactylus (Pterosauria: Pterodactyloidea) |journal= Journal of Paleontology |volume=70 |issue=2 |pages=335–338 }} 6. ^{{Cite journal | last1 = Bennett | first1 = S. C. | doi = 10.1127/0077-7749/2012/0295 | title = The morphology and taxonomy of the pterosaur Cycnorhamphus | journal = Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen | volume = 267 | pages = 23–41 | year = 2013 | pmid = | pmc = }} 4 : Late Jurassic pterosaurs of Europe|Ctenochasmatoids|Taxa named by Harry Seeley|Fossil taxa described in 1870 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。