how do cyclostomes reproduce
Answers
Answer:
The eggs of the sea lamprey are extruded at spawning in spring and summer through the body wall via the gonopore because cyclostomes have no genital ducts. They are expelled in clutches every 5–10 minutes for periods of 16 hours to 3½ days, in which time a total of 25,000 to 100,000eggs are laid.
Explanation:
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Answer:
Explanation:
Sexual reproduction is at once the most conservative and yet the most adaptive of functions in the propagation and evolution of species. The cyclostomes illustrate this principle very well. Furthermore, knowledge of how cyclostomes regulate their reproduction offers a basis for understanding the evolution of vertebrate reproductive control mechanisms in general. However, between the two major cyclostome groups, the differences in mechanisms regulating reproduction appear to be as great or greater than they are among the rest of the vertebrates as a whole. The basic differences in reproductive patterns between the two major agnathan groups, together with anatomical and paleontological evidence, indicate that the separation of the petromyzonids, or lampreys, and the myxinoids, or hagfishes, is a very ancient one.