The haemal coelom ( or haemal system, the " haemal " being a misnomer ), a perivisceral coelom, a gonadal coelom and often also a perihaemal coelom ( or perihaemal system ).
12.
The haemal coelom ( or haemal system, the " haemal " being a misnomer ), a perivisceral coelom, a gonadal coelom and often also a perihaemal coelom ( or perihaemal system ).
13.
The haemal coelom ( or haemal system, the " haemal " being a misnomer ), a perivisceral coelom, a gonadal coelom and often also a perihaemal coelom ( or perihaemal system ).
14.
In the larger species, additional vessels run above and below the intestine and are connected by over a hundred small muscular ampullae, acting as miniature hearts to pump blood around the haemal system.
15.
In the tail, these are attached to chevron-shaped bones called "'haemal arches "', which attach below the base of the spine, and help to support the musculature.
16.
Echinoderms are an exception having both a coelomic circulatory system ( i . e ., the water vascular system ) and a haemal circulatory system ( i . e ., the haemal and perihaemal systems ).
17.
Echinoderms are an exception having both a coelomic circulatory system ( i . e ., the water vascular system ) and a haemal circulatory system ( i . e ., the haemal and perihaemal systems ).
18.
The haemal arches possess a unique morphology, where only the ninth pair and onwards are fused distally, however unlike other diapsids they are not V-or Y-shaped in cranial view, but U-shaped.
19.
So, while Meyer was unable to come up with an exact number, he noted that " Acteosaurus " has at least 10 cervical vertebrae, and 27 posteroventrally positioned, unfused haemal arches on the vertebrae of the tail.
20.
It have features of the mosasauroids, with three vertebrae with haemal arches and procoelic centra, that suggest the possibility that these small bones belong to an embryo of this species, although the lack of diagnostic fossils like the skull or teeth prevents a complete identification.
