Definitions

Blood sinus surrounding heart and communicating with it by pair of ostia in each somite except terminal one, may run entire length of trunk above gut. [Moore and McCormick, 1969]
Blood sinus surrounding heart and communicating with it by paired ostia. [McLaughlin, 1980]
The blood-filled area surrounding the heart of a decapod crustacean.
(syn. pericardial sinus) [Bliss, 1982]
(Taxon-specific: Order Stomatopoda) Elongate cavity surrounding heart. Blood, coming from gills, collects in pericardium and enters heart via ostia.
(syn. pericardial cavity) [Stachowitsch, 1992]
(Taxon-specific: Order Leptostraca) Elongate cavity surrounding heart. Blood collected in pericardium enters heart through ostia.
(syn. pericardial sinus) [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Cavity surrounding heart; delimited ventrally from digestive tract by septum (pericardial floor). Blood in pericardium enters heart via ostia.
(syn. pericardial chamber, pericardial sac) [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) In circulatory system, cavity surrounding heart. Divided into anterior and posterior sections (the former enclosing heart). Blood in pericardium enters heart through ostia. [Stachowitsch, 1992]