bilaminar embryo

synonym: bilaminar blastoderm
https://doi.org/10.1351/goldbook.10457

Early blastula having only two of the three primary germ layers that it will ultimately have; the two layers present are the cells of the epiblast that will give rise to the ectoderm and those of the hypoblast that will become the endoderm during gastrulation - both attached to a basement membrane before the mesoderm has formed.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 729 [Terms] [Paper]