Delayed Reproduction in the Spotted Salamander.


  • *7 A.M. solar time, “summer time” having been introduced at 2 A.M.


.(1) A Spotted Salamander, kept in captivity without other salamanders, gave birth to a brood of larvae in May 1937, and another brood in April 1939. There was thus an interval of nearly two years between the broods.

(2) Possible explanations of this are discussed in the light of what is known of the reproductive cycle, and possibly analogous cases in reptiles are cited.

(3) It is suggested that two factors may have been involved–the retention of sperm for a longer time than usual, and an unusually prolonged gestation-period.