peritrophic membrane
Chitinous sheath secreted around feces (e.g., some Ostracoda) [Moore and McCormick, 1969].
Chitinous sheath secreted around feces [McLaughlin, 1980].
(Order Decapoda):
Chitinous membrane, secreted in anterior region of midgut and surrounding feces; considered to protect midgut lining from damage during passage of undigestible material [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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