Aspects of the topic macromere
are discussed in the following places at Britannica. Assorted References formation in annelids ( in annelid (invertebrate): Development ) ...four cells (blastomeres) give rise, by alternating clockwise and counterclockwise divisions, to a cap of smaller cells, cal...
...tomere of intermediate size, larger than a micromere but smaller than a macromere
... size intermediate between a macromere
and a micromere . ... ... features of the successive developmental sta...