blastopore

[ blas-tuh-pawr, -pohr ]

/ ˈblæs təˌpɔr, -ˌpoʊr /

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noun Embryology.

the opening of an archenteron.

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Origin of blastopore

1875–80; blasto- + -pore passage; see pore²

blas·to·por·ic

[blas-tuh-pawr-ik, -por-], /ˈblæs təˈpɔr ɪk, -ˈpɒr-/, blas·to·po·ral

[blas-tuh-pawr-uhl, -pohr-], /ˌblæs təˈpɔr əl, -ˈpoʊr-/, adjective

In other words, the position of the blastopore in the Selachian is not the same as in the Frog.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
It is hardly possible to help believing that the blastopore primitively represented a mouth.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
In Osseous Fishes the blastopore undergoes a similar change of position.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
In the caudal region the medullary folds spread out and enclose between them the blastopore, behind which they soon meet again.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour

The mesoblast grows out from the lip of the blastopore as four masses.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour