Definitions

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Sinus

A blood-filled space on the venous side of the circulatory system. [Warner, 1977]
Any space or cavity in body tissues; also, refers to broad concavity in margin of shell. [Butler, T. H.]
(Taxon-specific: Order Notostraca) Posterior emargination of carapace; bears series of small denticles.
(syn. notch) [Stachowitsch, 1992]
(Taxon-specific: Order Decapoda) In circulatory system, one of several spaces in which deoxygenated blood collects before entering gill and returning to pericardium and heart. According to position one may distinguish branchial, dorsal, infrabranchial, and sternal sinuses. [Stachowitsch, 1992]
(Taxon-specific: Order Stomatopoda) In circulatory system, more clearly delimited space in which blood collects. Blood coming from gills passes through segmentally arranged, dorsally directed sinuses before entering large pericardial cavity surrounding heart. (See also lacuna). [Stachowitsch, 1992]
(Taxon-specific: Subclass Branchiura) Term referring to either cleft between posterior lobes of abdomen or to blood sinus such as that surrounding compound eyes. [Stachowitsch, 1992]
(Taxon-specific: Subclass Cirripedia) In circulatory system, one of several blood-filled spaces. According to cirriped group and position one may distinguish epineural, mantle, prosomal, rostral, and thoracic sinuses. (See also rostral sinus). [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) In circulatory system, space in which blood collects. Typically refers to system of ventral sinuses (supraneural sinus, sternal sinus). [Stachowitsch, 1992]