#Terebralia palustris with a ton of post mortem #polydorid borings
#polydora
#caulostrepsis
#neoichnology
#molluscsofsrilanka

Happy #FosailFriday
This #chione shell has multiple mysterious traces:
Borings that have penetrated in, probably a taphonomic artifact
Burrow with a reinforced roof that protrudes over the shell
Paired #polydorid entry borings. 
The latter suggest that this is indeed a polydorid trace

#Placuna placenta? has a thin & translucent shell which is surprisingly hard They are used for various crafts & as alternatives for glass panes AKA #windowpane oysters This specimen has several external #borings made by #polydorid worms forming #mudblisters