ASTM_D412_橡胶拉伸性能测定(中文).pdf

Gulf Pipefish ( Syngnathus scovelli ) Justin Krol Abstract The Gulf Pipefish, Syngnathus scovelli, is a long, slender, bony fish that lives mainly in the Gulf of Mexico and parts of South America. It i s often studied for its male pregnancy adaptions and mating systems. It displays sexual di morphism and sex reversal with the females being larger and showing more secondary sex charact eristics. Syngnathus scovelli also employs unique feeding tactics which will be discussed late r on in the report. Classification The Gulf Pipefish is a bony fish in the class Acti nopterygii. It is placed in the order Gasterosteiformes, meaning bone belly. Gasterosteif ormes are characterized by pelvic bones without anterior processes, the absence of the Band elot’s ligament (a ligament that attaches the shoulder girdle to the cranial base or anterior ver tebrae), and the configuration of scales that are more of a scute or plate (Grzimek's 2004). The Gulf Pipefish is then placed in the family Syngnathidae (seahorses and pipefish). Syngnathids are characterized by male pregnancy, bony rings surrounding the body, and a fused tubular mou th. General Characteristics The Gulf Pipefish is a slender, tubular fish that grows to six inches in length. Its head is not at an angle to the body; it lacks pelvic or ana l fins, and has a straight