Metatrochophore

The metatrochophore of a deep-sea hydrothermal vent vestimentiferan has a foregut and a midgut.

The foregut cells have several microvilli, basal bodies, and cilia, with e-dense granules dispersed in the apical cell region.

The diameter of the midgut in one specimen was 50 μm and the lumen’s diameter was 7 μm, in which the cilia extended and e-dense material was found.

Additionally, the midgut contained a few bacteria in the lumen.

[4] Metatrochophores have a number of features trochophores lack, including eyespots and segments.