What animals have Gastralia?
Gastralia are also present in a variety of extinct animals, including theropod and prosauropod dinosaurs, pterosaurs, plesiosaurs, choristoderes and some primitive pelycosaurs. In dinosaurs, the elements articulate with each other in a sort of zig-zag along the midline and may have aided in respiration.
Do crocodiles have Gastralia?
Crocodiles, plesiosaurs, ichthyosaurs, and theropod dinosaurs have gastralia. Unlike ribs, they are not connected to the vertebrae.
Do lizards have Gastralia?
Gastralia may have been derived from the ventral scales found in animals like rhipidistians, labyrinthodonts, and Acanthostega, and may be related to ventral elements of turtle plastrons. Similar, but not homologous cartilagenous elements, are found in the ventral body walls of lizards and anurans.
Do birds have gastralia?
Archaeopteryx had gastralia, though modern birds do not. It isn’t hard to imagine why birds lost those abdominal bones.
Do all dinosaurs have Osteoderms?
Osteoderms are found in many groups of extant and extinct reptiles and amphibians, including lizards, crocodilians, frogs, temnospondyls (extinct amphibians), various groups of dinosaurs (most notably ankylosaurs and stegosaurians), phytosaurs, aetosaurs, placodonts, and hupehsuchians (marine reptiles with possible …
How did Coelophysis go extinct?
The rains stopped and hundreds of carcasses of Coelophysis, the nimble predator of the Late Triassic, settled into the mud. Some skeletons were complete, some were torn apart, but all went to the bottom of the stream.
What was a Coelophysis habitat?
Coelophysis was a carnivore. It lived in the Jurassic period and inhabited Africa and North America. Its fossils have been found in places such as Texas, Yunnan (China) and Matabeleland North (Zimbabwe).
Does a chicken have a fibula?
Both the human leg and chicken leg have a femur, a fibula, and a tibia. In a chicken, the femur holds the thigh meat, and the fibula/tibia combination holds the meat of the drumstick. The metatarsus of a chicken is known as the shank, and the chicken walks on its toes.
Does a crocodile have ribs?
You have seven true ribs attached to the breast bone (sternum), three false ribs that are attached to the spine and combine at the bottom of the seventh rib, and two floating ribs.
What is the purpose of osteoderms?
Osteoderms are dermal bone structures that support the upper layer of skin and serve as protection against the elements in a large variety of extinct and extant organisms, especially reptiles.
What are osteoderms made of?
Osteoderms are composed of bone tissue, and are derived from a scleroblast neural crest cell population during embryonic development of the organism. The scleroblastic neural crest cell population shares some homologous characteristics associated with the dermis.