Favreinidae are rod shaped coprolite pellets containing longitudinal canals produced by crustaceans such as ghost shrimp and crayfish.
Crustacean Crapola #2
(Crustacean Coprolites with Canals)
(Crustacean Coprolites with Canals)
Crustacean Crapola
(Crustacean Coprolites with Canals)
(Crustacean Coprolites with Canals)