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A series of stages in the embryonic development of Chelydra serpentina
Author(s) -
Yntema C. L.
Publication year - 1968
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051250207
Subject(s) - chelydra , biology , turtle (robot) , period (music) , incubation , constant (computer programming) , embryo , zoology , anatomy , ecology , microbiology and biotechnology , biochemistry , physics , computer science , acoustics , programming language
Eggs of the common snapping turtle, Chelydra serpentina serpentina were incubated at 30°C and at 20°C. The incubation period at the higher temperature was about 63 days. At the lower temperature, the period was estimated to be 140 days. Lengths of the embryos at various times of development were recorded. A series of 26 stages is described. The staging is based on timed intervals at a constant temperature, 20°C.