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1 February 2019 Twins at Conspicuously Different Developmental Stages in a Turtle Egg
Tatsuya Hirasawa, Cantas Alev, Shigeru Kuratani
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One-egg twins, in general, initiate embryonic development at the same time, and their developmental stages proceed in parallel. Here we report a rare case of the embryonic development of the red-eared slider turtle, Trachemys scripta, in which twins at conspicuously different developmental stages developed on a single yolk. One of the twins appeared to have developed at the normal developmental rate, whereas the development of the other was markedly delayed, despite the absence of any overt anomalies. This observation suggests uncoupled or fully independent differential regulation of embryonic development from either a single or, more likely, two distinct pluripotent blastoderms sharing the same yolk and same environmental conditions.

© 2019 Zoological Society of Japan
Tatsuya Hirasawa, Cantas Alev, and Shigeru Kuratani "Twins at Conspicuously Different Developmental Stages in a Turtle Egg," Zoological Science 36(1), 1-4, (1 February 2019).
Received: 6 July 2018; Accepted: 6 August 2018; Published: 1 February 2019
embryonic development
pluripotent blastoderm
reptilian egg
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