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Rhoetosaurus

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Rhoetosaurus (meaning "Rhoetus lizard", after a titan in Greek mythology) is a genus of sauropoddinosaur from the Late Jurassic (Oxfordian)[1]Walloon Coal Measures of what is now eastern Australia. Rhoetosaurus is estimated to have been about 15 metres (49 ft) long, weighing about 9 tonnes (8.9 long tons; 9.9 short tons).[2] Subsequent authors have sometimes misspelled the name: Rhaetosaurus (de Lapparent & Laverat, 1955); Rheteosaurus (Yadagiri, Prasad & Satsangi, 1979).

Discovery and species

Size comparison

In 1924, Heber Longman, self-trained paleontologist at (and later director of) the Queensland Museum in Brisbane, learned of a large fossil reptile skeleton exposed in the Walloon Coal Measures at Durham Downs near Roma in southern inland Queensland. The station manager, Arthur Browne, forwarded fragments of bone to Longman, and was honoured with the dinosaur's specific name brownei. The initial collection was of 22 tail vertebrae, including a series of 16 consecutive bones, and other fragmentary hindlimb pieces. Soon after Longman announced the new discovery, he visited the station and arranged for more material of the same skeleton to be sent to the Queensland Museum. These included additional vertebrae from the thoracic area, bits of rib, more caudals and more of the femur and pelvis as well as a cervical vertebra. Further material was collected by Mary Wade and Alan Bartholomai in 1975, and still more by Drs. Tom Rich, Anne Warren, Zhao Xijin, and Ralph Molnar. By 2012, prepared material comprised 40 vertebrae, five partial thoracic ribs, part of the sacrum, fragments of the ilia, an ischium, the left and right pubic bones, and much of the right hind limb (femur, tibia, fibula, astragalus, and pes). More bones are yet to be removed from rock.[3]

Rhoetosaurus is among the best-known sauropods thus far discovered in Australia, as well as for the Jurassic of Gondwana.

Relationships

Inicialmente, Longman, con el asesoramiento del destacado paleontólogo alemán Friedrich von Huene , señaló la naturaleza primitiva de Rhoetosaurus , por lo que durante mucho tiempo se le denominó cetiosáurido . Más recientemente, otros lo han comparado con Shunosaurus , basándose en una edad general similar y varios rasgos de sus extremidades posteriores. [ 3 ] En un estudio filogenético de 2012, se determinó que Rhoetosaurus era un saurópodo basal justo fuera de Eusauropoda , pero los autores señalaron que el apoyo a su posición era débil y que su ubicación como eusauropodo no podía rechazarse, pero que definitivamente no era miembro de Neosauropoda . [ 3 ]

Referencias

  1. ↑ Todd, CN; Roberts, EM; Knutsen, EM; Rozefelds, AC; Huang, H.-Q.; Spandler, C. (2019). "Edad refinada y contexto geológico de dos de los taxones de vertebrados jurásicos más importantes de Australia ( Rhoetosaurus brownei y Siderops kehli ), Queensland". Gondwana Research . 76 : 19–25 . Bibcode : 2019GondR..76...19T . doi : 10.1016/j.gr.2019.05.008 .
  2. ↑ Paul, GS, 2010, The Princeton Field Guide to Dinosaurs , Princeton University Press, pág. 173
  3. 1 2 3 Nair, Jay P.; Salisbury, Steven W. (2012). "Nueva información anatómica sobre Rhoetosaurus brownei Longman, 1926, un dinosaurio sauropodomorfo gravisaurio del Jurásico Medio de Queensland, Australia". Journal of Vertebrate Paleontology . 32 (2): 369– 94. Bibcode : 2012JVPal..32..369N . doi : 10.1080/02724634.2012.622324 .

Lecturas adicionales

  • Long JA (1998). Dinosaurios de Australia y Nueva Zelanda y otros animales de la Era Mesozoica . UNSW Press. ISBN 0-86840-448-9.
  • Longman, HA (1926). "Un dinosaurio gigante de Durham Downs, Queensland" . Memorias del Museo de Queensland . 8 : 183–194 .
  • Longman, HA (1927). "El dinosaurio gigante Rhoetosaurus brownei " . Memorias del Museo de Queensland . 9 : 1–18 .
  • Rhoetosaurus