What is "syncarida"

Syncarida is a superorder of crustaceans, comprising the two extant orders Anaspidacea and Bathynellacea, and the extinct order Palaeocaridacea. Fifty-nine living genera are known, in six families:

Anaspidacea Calman, 1904

• Anaspididae Thomson, 1893
• Koonungidae Sayce, 1908
• Psammaspididae Schminke, 1974
• Stygocarididae Noodt, 1963

Bathynellacea Chappuis, 1915

• Bathynellidae Grobben, 1904
• Parabathynellidae Noodt, 1965