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Change in inheritance in echinoid hybrids

Published online by Cambridge University Press:  11 May 2009

Sven Hörstadius
Sven Hörstadius
Affiliation:
From the Plymouth Laboratory, and theZootomical Institute, Stockholm
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Extract

In 1932 crosses were made at Plymouth between Psammechinus miliaris ♀, both Z-type (from the shore) and S-type (from Eddystone), and Echinus esculentus ♂. The larvae from the S eggs differed in size and shape from those from the Z eggs (cf. Figs. 1,2 with 3–6). None of the hybrid plutei possessed the green pigment of P. miliaris, nor the posterior epaulettes of E. esculentus. Some of the larvae (Figs. 3, 4) had a posterior pedicellaria, like E. esculentus, in others this organ was missing (Figs. 1, 2, 5, 6). Some of these plutei were preserved, others went through metamorphosis. Healthy larvae of these combinations (00+ and 000) have not hitherto been described. The results are compared with those of previous authors (see table, p. 100). Some possible causes of change of inheritance in different years are discussed.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 24 , Issue 1 , January 1940 , pp. 99 - 113
Copyright
Copyright © Marine Biological Association of the United Kingdom 1940

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