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[tigerluver]

More on Spinosaurus

Here are some big points the author proposed:

• "The long dorsal and hypertrophy of neural spines vertebrae are a strong indication to deny a vertical bipedal posture. The man himself is sub-optimal in the upright posture, as we recall our sore schena, then a fortiori it would Spinosaurus."
• "This question is more complex than the discussed and controversial hypothesis if Spinosaurus was capable of quadrupedal gait... Ibrahim et al. (2014) conclude that, based on their reconstruction, Spinosaurus "on the mainland must have been an obligatory quadruped". However, the "evidence" in support of what they are only that the proportions of her body imply that he was physically unable to maintain this a bipedal posture "classical" typical of all theropodi. But this does not necessarily imply that took on a quadrupedal locomotion. As I wrote in a past post, there is a wide range of alternatives to not being able to maintain the classic posture: the tripod (like some mammals, such as kangaroos), the upright biped (like the man and the penguins), or posture horizontal, creeping with his belly on the ground (such as seals or penguins when they skate on pushing snow with your feet)."
• "Based on what we already know, I exclude that Spinosaurus was capable of quadrupedal locomotion. Based on direct data, in fact, the only element of the forelimb bone preserved in Spinosaurus C, the phalanx of the hand, crying vigorously a clear answer: it is completely devoid of adaptations to support the weight on the hands."
• "Furthermore, until we have elements of the pectoral girdle, it is totally unjustified to think that Spinosaurus was able to alternately move his arms in a quadrupedal locomotion."
• "Based on these considerations, I think that the hypothesis of a creeping horizontal posture, to "seal" or, to remain in Theropoda, from "Penguin crawling on his belly", can be the key to understanding Spinosaurus out of the water. Namely, by extending the reasoning of D. Nash, I think that a horizontal posture animal compulsorily in contact with the substrate, Short hind limbs still capable of generating a strong thrust locomotor (the fourth trochanter of the femur is huge) both in water and on a muddy substrate, can be the solution of the anomalies proportional Spinosaurus, without having to resort to a quadrupedal posture that, until proven otherwise, has no morphological evidence in his favor. The shape of the rib cage of Spinosaurus, deductible from the coasts of present nell'olotipo Stromer, suggests a large ventral chest area, ideal for maximizing the distribution of body weight on the muddy substrate."
  

Yikes, we went from a biped to quadruped to Sealosaurus rex as the big Spinosaurus is continuously investigated. Reply