Tube ultrastructure of fossil Ditrupa (Serpulidae)

 

 

Ditrupa strangulata, cross section, showing internal calcitic homogeneous granular layer (left) and external calcitic irregular prismatic layer. Eocene, Belleu, France.

 

 

Ditrupa gracillima, longitudinal section, showing external calcitic irregular prismatic layer. Middle Miocene, Australia.

 

 

Ditrupa gracillima, longitudinal section, showing details of the external calcitic irregular prismatic layer. Middle Miocene, Australia.

 

 

SEM photographs by O. Vinn