From Wikipedia, the free encyclopedia. Calcitonin (also known as thyrocalcitonin) is a 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells (also known as C-cells) of the thyroid, and in many other animals in the ultimobranchial body.t acts to reduce blood calcium (Ca 2+), opposing the effects of parathyroid hormone (PTH). Calcitonin has been found in fish, reptiles, birds, and mammals.
There are 7 different species of rattlesnakes found in California. Two of these species consist of more than one subspecies, making a total of 10 different kinds of rattlesnakes found in the state.
Also see our Venomous Snakes of Southeast Texas poster. *Note: Although there are only 4 species of venomous snakes in Texas, there are several subspecies of these snakes (11 rattlesnakes, 1 cottonmouth, 3 copperheads, 1 coral snake). The Southeast Texas poster displays the subspecies found in that area.lso see our Venomous Snakes of Southeast Texas poster. *Note: Although there are only 4 species of venomous snakes in Texas, there are several subspecies of these snakes (11 rattlesnakes, 1 cottonmouth, 3 copperheads, 1 coral snake). The Southeast Texas poster displays the subspecies found in that area.