THYROIDAL FUNCTION IN THE FISHES FUNDULUS HETEROCLITUS F. MAJALIS, AND F. DIAPHANUS1

摘要: IN THE evolution of organs or systems it is generally believed that successive changes in them persist principally because they endow the organism with new properties important adaptability and continuance species. In this sense lack what would appear to be an function for thyroid gland fish presents a real challenge comparative endocrinologist. There no clear indication nature value most primitive living vertebrate groups have led fairly complex as well its system functional control by pituitary. It has been shown thickens epidermis (Harms, 1929; LaRoche, 1952), may affect pigmentary pattern (La- Roche, 1952; Robertson, 1948) increase retrobulbar connective tissue various species (LaRoche, 1952).