How to use Trochosphere in a sentence

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

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  • 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.

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

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

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  • D, Further advanced trochosphere (optical section).

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

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

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  • 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.

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

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  • The larva swims by a ri ig of cilia, which corresponds with the praeoral circlet of a Trochosphere.

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  • The early larva of Anodonta is not unlike the trochosphere of other Lamellibranchs, but the mouth is wanting.

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  • D, E, F, Trochosphere stage, D fp, Pore in the foot (belonging mf, The mantle-flap or limbus to the pedal gland?).

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  • B, The Gastrula has become a Trochosphere by the development of the ciliated ring vr (optical section).

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  • C, Side view of the Trochosphere with commencing formation of the foot.

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  • D, Further advanced Trochosphere (optical section).

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  • E, The Trochosphere passing to the Veliger stage, dorsal view showing the formation of the primitive shell-sac.

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  • The larval form thus produced is known as the trochosphere.

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  • By the development of a ciliated ring just in front of the mouth the embryo becomes a trochosphere.

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  • The external surface of the trochosphere is formed of a number of ciliated test-cells.

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  • This little creature, which has many of the features of a Trochosphere larva, swims about at the surface of the sea for about a month and grows rapidly.

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  • Most observers consider that Actinotrocha is a highly modified Trochosphere, and this would give it some claim to be regarded as distantly related to the Entoproct Polyzoa and to other groups which have a Trochosphere larva.

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  • But in these epibolic forms, just as in the embolic Paludina, the embryo proceeds to develop its ciliated band and shellgland, passing through the earlier condition of a trochosphere to that of the veliger.

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  • B, Trochosphere of an Opisthobranch (Pleurobranchidium) showing - shgr, the shell-gland or primitive shell-sac; v, the cilia of the velum; ph, the commencing stomodaeum or oral invagination; ot, the left otocyst; pg, red-coloured pigment spot.

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