UTF-8 U+6211 U+662F wrote: GurtYo wrote:
UTF-8 U+6211 U+662F wrote:They should be the same organism, but some things you can write about the fossils are the distribution, commonly found fossils, etc.
So I don't write about how it lived, ate, etc?
Do write about those. It's probably similar to its current lifestyle though.
So I shouldn't put this? The part of what organs and stuff like that the current ones have? However, should I put the comparison of the current ones to the fossils?
Possess a three-lobed caudal fin (also called a trilobate fin or a diphycercal tail).
A secondary tail extending past the primary tail separates the upper and lower halves of the coelacanth. Cosmoid scales act as thick armor to protect the coelacanth's exterior.
Several internal traits also aid in differentiating coelacanths from other lobe-finned fish.
At the back of the skull, the coelacanth possesses a hinge, the intracranial joint, which allows it to open its mouth extremely wide.
Retain an oil-filled notochord, a hollow, pressurized tube which is replaced by the vertebral column early in embryonic development in most other vertebrates.
Comparisons: Heart is shaped differently from that of most modern fish, with its chambers arranged in a straight tube. The cheeks of the coelacanth are unique because the opercular bone is very small and holds a large soft-tissue opercular flap. A spiracular chamber is present, but the spiracle is closed and never opens during development. Coelacanth also possess a unique rostral organ within the ethmoid region of the braincase. Also unique to extant coelacanths is the presence of a "fatty lung" or a fat-filled single-lobed vestigial lung, homologous to other fishes' swim bladder. The parallel development of a fatty organ for buoyancy control suggest a unique specialization for deep-water habitats. There has also been discovered small, hard but flexible plates around the vestigial lung in adult specimen, though not around the fatty organ. The plates most likely had a regulation function for the volume of the lung. Due to the size of the fatty organ, researchers assume it's responsible for the kidney's unusual relocation. The two kidneys, which are fused into one, are located ventrally within the abdominal cavity, posterior to the cloaca.