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Normal Development in Newts (Triturus) and Its Arrest as a Consequence of an Unusual Chromosomal Situation

Heather A. Horner and Herbert C. Macgregor
Journal of Herpetology
Vol. 19, No. 2 (Jun., 1985), pp. 261-270
DOI: 10.2307/1564180
Stable URL: http://www.jstor.org/stable/1564180
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Normal Development in Newts (Triturus) and Its Arrest as a Consequence of an Unusual Chromosomal Situation
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Abstract

The normal table of development to tail bud is described for the genus Triturus. The rate of development is strongly influenced by temperature. Embryos raised at 25°C develop about 6 times faster than those raised at 10°C. The morphological stage of embryo arrest which occurs in half of all tadpoles of the two Triturus species, T. cristatus and subspecies, and T. marmoratus, is defined. Embryos raised at 25°C arrest 1 or 2 stages later than those raised at temperatures below 15°C, but the proportion of embryos that arrest stays the same. Hybrid embryos also exhibit embryo arrest. Embryo arrest is a consequence of homomorphism for the longest chromosome (chromosome 1). Normal development requires heteromorphism for chromosome 1.

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