blastosphere

When the egg of Amphioxus is in the blastosphere stage we cannot speak of either an epiblast or hypoblast.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
The hollow sphere which is thus formed is the important stage of the “germinal vesicle,” the blastula, or blastosphere.
The Riddle of the Universe at the close of the nineteenth century|Ernst Haeckel
Thus, an oval and an elongate egg produce respectively an oval and an elongate blastosphere.
The Biological Problem of To-day|Oscar Hertwig
A limit is set to increase in the size of a blastosphere by the nature of the material of its walls.
The Biological Problem of To-day|Oscar Hertwig

The central part of the blastosphere is called the segmentation cavity or blastocoel.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3|Various

British Dictionary definitions for blastosphere

blastosphere

/ (ˈblæstəʊˌsfɪə) /

noun

another name for blastula

another name for blastocyst (def. 1)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

blastosphere

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British Dictionary definitions for blastosphere