Noun:

ट्रोपोस्फीयर,

trochosphere's Usage Examples:

The foot now protrudes below the mouth, and the post-oral hemisphere of the trochosphere grows more rapidly then the anterior or velar area.

When the middle and hinder regions of the blastopore are closing in, an equatorial ridge of ciliated cells is formed, converting the embryo into a typical trochosphere.

- Embryo of Limnaeus stagnalis, at a stage when the Trochosphere is developing foot and shell-gland and becoming a Veliger, seen as a transparent object under slight pressure.

In development they pass through the typical trochosphere and veliger stages provided with boat-like shell.

E, The trochosphere passing to the veliger stage, dorsal view showing the formation of the primitive shell-sac.

D, Further advanced trochosphere (optical section).

C, Side view of the trochosphere with commencing formation of the foot.

B, The diblastula has become a trochosphere by the development of the ciliated ring y r (optical section).

A well-marked trochosphere is formed by the development of an equatorial ciliated band; and subsequently, by the disproportionate growth of the lower hemisphere, the trochosphere becomes a veliger.

It has simply been traced as far as the formation of a diblastula which acquires a ciliated band, and becomes a nearly spherical trochosphere.