haemal vertebra
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hemal vertebra — haemal vertebra … Dictionary of ichthyology
Haemal arch — A haemal arch is a bony arch on the underside of a tail vertebra of a vertebrate. It may represent the ribs of that tail vertebra.The hole so formed is the haemal canal.It sometimes has a haemal spine on.The blood vessels to and from the tail run … Wikipedia
vertebra — (plural vertebrae)) bony or cartilaginous elements surrounding the notochord or replacing it and often protecting the spinal cord and caudal vein. Vertebrae are composed of a centrum formed from two pleurocentra and two intercentra or parts of… … Dictionary of ichthyology
vertebra aspondyla — (plural vertebrae aspondylae)) aspondylous vertebra (a vertebra lacking a centrum although neural and haemal arches are well developed, e.g. in Cyclostomata, Holocephali, Dipnoi, Acipenseridae) … Dictionary of ichthyology
vertebra diplospondyla — (plural vertebrae diplospondylae)) diplospondylous vertebra (the double vertebrae formed when the anterior and posterior elements (sclerotomes) have not fused, e.g. caudal vertebrae of Amia. Two types of centra are present, a precentrum lacking… … Dictionary of ichthyology
spreitzer vertebra — a unique type of anterior caudal vertebrae in which the haemal arch is not closed; the open haemal arches of the first 2 3 caudal vertebrae allowing the expansion of the abdominal cavity posteriorly into the caudal peduncle, especially in adults… … Dictionary of ichthyology
caudal vertebra — one of the posterior vertebrae lacking ribs, found behind the abdominal vertebrae and extending to the tail, each with a ventral haemal arch, canal and spine. The first caudal vertebrae is near the internal, dorsal tip of the first anal proximal… … Dictionary of ichthyology
aspondylous vertebra — a vertebra lacking a centrum although neural and haemal arches are well developed, e.g. in Cyclostomata, Holocephali, Dipnoi, Acipenseridae … Dictionary of ichthyology
abdominal vertebra — one of the anterior vertebrae bearing ribs but lacking the haemal arch, canal and spine of caudal vertebrae, q.v … Dictionary of ichthyology
vertebral counts — usually all the vertebrae are counted. If sutures are present in the urostyle, the indicated elements are counted. When sutures are absent the urostyle (if present) is usually counted as one vertebra. Vertebral counts may be separated into… … Dictionary of ichthyology
