The globe is divided by the equatorial plane into two equal halves, the northern and the southern hemisphere.
Perpendicular to this axis is the equatorial plane of the disk by which it becomes divided into equal halves.
The spines lie not only in the equatorial plane (as is usual) but also in two to four crowded girdles on both sides of it.
The growth of the capsule corresponds to that of the including shell, gradually increasing on the margin in the equatorial plane.
The angle between the former and the equatorial plane is about 30, the angle between the latter and that plane about 60.
In the second subfamily, Trochodiscida, the margin is armed with solid radial spines, lying in the equatorial plane.
In the equatorial plane arises a circle of four to six short conical protuberances, similar to the polar tubes.
The spines lie not only in the equatorial plane (as usual), but also in two to four crowded girdles on both sides of it.
In the equatorial plane only one single chambered ring, divided by forty-four radial beams into narrow chambers.
Six stronger conical radial spines on the six corners at equal distances, lying in the equatorial plane of the disk.
equatorial plane e·qua·to·ri·al plane (ē'kwə-tôr'ē-əl, ěk'wə-)
The plane that contains all of the centromeres and their spindle attachments during metaphase of mitosis.