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Fossiles Riesenkrokodil aus Kenya

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  • Fossiles Riesenkrokodil aus Kenya

    14.05.2012 | 07:00

    World’s Largest Crocodile Named after Icelander

    Scientists recently confirmed that fossils that were excavated in Kenya in the 1960s and 70s were of a previously unknown prehistoric crocodile, the largest of its kind to have existed on earth.

    crocodylus_thorbjarnarsoni_wiki

    Life restoration of Crocodylus thorbjarnarsoni. Source: Wikipedia.

    The species was named Crocodylus thorbjarnarsoni earlier this year in honor of John Thorbjarnarson, an American conservationist of Icelandic decent who worked to protect endangered crocodilians.

    John was born in the United States in 1957 to Icelandic surgeon Björn Þorbjarnarson and his wife Margaret. He was among the world’s foremost experts on crocodiles and played a big part in the protection of predators. He died of malaria in India two years ago, Fréttablaðið reports.

    “Internationally, he had become some kind of a giant in the research and protection of crocodiles,” said John’s relative, Icelandic author and environmentalist Andri Snær Magnason. “He was a very modest man who had to work with tribes against corrupted governments.”

    Andri Snær stated John saved many species from extinction. “He had just finished a book on the Chinese crocodile. There were only 100 left in the Yangtze river when measures were taken to save them.”

    Crocodylus thorbjarnarsoni is believed to have lived two to four million years ago and have measured up to nine meters in length. It is thought to have ambushed people and swallowed them whole when they went to fetch water from the Mid-African plains.

    “John is a good example of people who follow their childhood dreams. One could say that his dream came true when the world’s largest crocodile was named after him,” Andri Snær concluded.

    ESA

  • #2
    Moooooment,

    ich denke das hier war das größte Krokodil der Welt:
    http://www.supercroc.org/supercroc/about.htm

    40 Fuß sind immerhin über 12 Meter, was üblicherweise größer als 9 Meter ist.

    Auf Antwort wartende Grüße,
    Ozan

    Kommentar


    • #3
      Weil Sarcosuchus nicht den Crocodilia zugehörig ist. Der sieht zwar aus wie ein Tomistoma, ist aber systematisch nicht zugehörig: http://de.wikipedia.org/wiki/Sarcosuchus#Systematik

      Kommentar


      • #4
        Aber der erste Satz in dem Artikel heißt doch "Sarcosuchus ist eine ausgestorbene Gattung der Krokodile (Crocodilia)".

        Gruß,
        Ozan

        Kommentar


        • #5
          Das Ganze ist nicht so ganz einfach zu useinanderzusetzen,fossile Systematik halt - deswegen wieder nach ein bisschen googlen- gut erklärt :"
          Sarcosuchus is not an ancestor of crocodiles, and it is not a crocodilian in the phylogenetic definition of the term. A crocodilian is any member of the clade Crocodilia. Crocodilia includes all modern forms, such as crocodiles proper, alligators, etc., and their immediate prehistoric relatives. Sarcosuchus is a member of the family Pholidosauridae, more distantly related to crocodilians.

          "Crocodile" is a term commonly used in a much broader sense. The first "crocodile-like reptiles" — the Crocodylomorpha — which split from the bird-line of archosaurs — the group of reptiles that include dinosaurs, pterosaurs and birds — about 230 million years ago, in the Late Triassic, looked somewhat like modern crocodilians. They had long legs and long bodies covered with armour.

          Until the 1980s, the pholidosaurids were classified as part of the presumed suborder Mesosuchia, within the order Crocodilia. However, Benton and Clark determined in 1988 that Mesosuchia was a paraphyletic group, containing the ancestor of all modern crocodiles. A simplified evolutionary tree:[6]

          Crocodylomorpha
          Mesoeucrocodylia
          Metasuchia
          Neosuchia
          Pholidosauridae
          Sarcosuchus
          Crocodilia (modern crocodiles)

          Teeth and osteoderms found in Brazil belong to a close relative of Sarcosuchus: Sarcosuchus hartii (Marsh, 1869). S. hartii has a complicated taxonomic history. It was discovered in 1867 by an American naturalist, Charles Frederick Hartt near a train station in the area of Recôncavo in the state of Bahia in northeastern Brazil. Hartt send the fossils - teeth, osteoderms and a fragment of the jaw - to the American paleontologist Othniel Charles Marsh, who later published its scientific description in the American Journal of Science, in 1869, naming based on these remains two new species: Thoracosaurus bahiensis, with small teeth strongly striated and Crocodilus hartii, with large teeth with little roughs.[7] The specific name hartii honors Charles Hartt. Subsequent findings of crocodilians in the area were attributed to a species described by Edward D. Cope, Hyposaurus derbianus of Pernambuco;[8] in 1907 Mawson and Woodward reclassified the material as belonging to the genus Goniopholis, with the species G. bahiensis and G. hartii, the latter including additional remains found until that time.[9]

          The status of these fossils remained so until a restudy of the same made by Eric Buffetaut and Philippe Taquet in 1977. The study examined the remains compared with the genus Sarcosuchus described by Taquet in 1966. The remains showed more similarities to Sarcosuchus than Goniopholis, for example the Brazilian and North African remains had a very long mandibular symphysis, an indicator of long-snouted skull, while Goniopholis had a shorter snout, and therefore its symphysis was equally short.[10] The jaws of both crocodilians were spatulate in form at the front, with the first and second socket of the teeth very small and the third and fourth enlarged teeth are similar in size and shape, with the same enamel ornamentation in the form of roughness winding.[10] The attribution to Goniopholis, based on the shape of the osteoderms (bone scutes), it seems unlikely since it is based on the presence of a peg in them, which is common to other Mesozoic crocodilians as Steneosaurus.[10] Other remains of Bahia attributed to Thoracosaurus bahiensis and Hyposaurus and can not be attributed to the level of genus or species, and their assignment was based on the idea that sediments in the area are Upper Cretaceous, when in fact are from the Lower Cretaceous.[10] Taquet and Buffetaut therefore concluded that the species should be reassigned to Sarcosuchus, maintaining the separation of African and South American remains in two different species (S. imperator and S. hartii) given the geographical separation, but their level of similarity is so strong that they could not rule that in reality they were a single species, although this hypothesis could only be contrasted with the discovery of additional remains.[10] The Brazilian Sarcosuchus, like S. imperator was a large animal. The skull of S. imperator is 1.8 meters long, with a body of 11 to 12 meters long; for its part, the cranial remains of S. hartii measures 43 centimeters in length, although only is the anterior part of the mandible, so it can be assumed similar in size to the African species. The similarities between this two species it is possibly evidence that land bridges between Africa and South America existed much later than was previously believed.[10]

          On the other hand, based on the structure of the snout, the closest relative of Sarcosuchus is the pholidosaurid Terminonaris, with Dyrosaurus and Pholidosaurus as slightly more distant relatives. As a group, they are narrow-snouted fish-eaters from saltwater environments, except for the broader snouted, river-dwelling Sarcosuchus.

          Kommentar


          • #6
            Mit 7,5 Meter Länge war dieses Krokodil gar nicht das Grösste, ich denke die heute noch lebenden Salzwasser-Krokodile haben zumindest in früherer Zeit durchaus 8 Meter erreicht - wenn nicht mehr.

            Kommentar


            • #7
              Die Salzwasserkrokodile sind doch Leistenkrokodile, oder nicht?

              Das heute lebende Größte ist angeblich der Sunda-Gavial oder der Gangesgavial, wobei der Sundergavial, nach meinem Kenntnisstand, kein Gavial ist sondern ein Echtes-Krokodil.

              Der Kryptozoologie nach, halten sich ja noch Geschichten über Riesenkrokodile in Afrika, obwohl ich das für eher unwahrscheinlich halte.

              Kommentar


              • #8
                He, ich hab' durch Zufall gerade das größte Krokodil gefunden.... wer hätte's gedacht, ein Australier

















                /ironyoff Im zugehörigen Artikel wird das Tier als "18 foot" lang beschrieben, also immerhin stolze 6m. Ob das nun das wirkliche Maß ist, oder doch eher eine Schätzung sei mal dahingestellt (so ein lebendes Saltie lässt sich ja eher umständlich vermessen), aber das schöne Bild zeigt wohl eine mäßige Montage, denn "18 foot" würde ich sonst, gelinde gesagt, als Untertreibung ansehen.

                Gruß
                Dennis
                Obwohl ich die mächtige Suchfunktion benutzt, meinen nächstgelegenen reptilienkundigen Tierarzt aufgesucht, die veterinärmedizinische Datenbank durchsucht, mein Tier den gesetzlichen Mindestanforderungen zur Reptilienhaltung gemäß untergebracht... und den Nachbarn des Schwippschwagers meiner Großtante befragt habe, ist meine Frage immer noch unbeantwortet!

                Kommentar


                • #9
                  Was ist damit?

                  http://www.dailymail.co.uk/news/arti...villagers.html

                  oder mit Gustav:

                  http://www.youtube.com/watch?v=JSVEGdUuqpY

                  Kommentar


                  • #10
                    Zitat von Reptillo Beitrag anzeigen
                    ....

                    Der Kryptozoologie nach, halten sich ja noch Geschichten über Riesenkrokodile in Afrika, obwohl ich das für eher unwahrscheinlich halte.


                    Nee, die größten sieht man gelegentlich nachts bei RTL2 & Co . Die nennen sich dann "Monster aus dem Sumpf" und so ...
                    :ggg:

                    Kommentar


                    • #11
                      Zitat von Daniel Hofer Beitrag anzeigen
                      Mit 7,5 Meter Länge war dieses Krokodil gar nicht das Grösste, ich denke die heute noch lebenden Salzwasser-Krokodile haben zumindest in früherer Zeit durchaus 8 Meter erreicht - wenn nicht mehr.
                      Hallo Daniel,

                      kannst Du dafür einen Nachweis bringen?

                      Gruß, MArco

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