Syntheciidae Marktanner-Turneretscher, 1890
Synthecium brucei Vervoort & Watson, 2003
Synthecium campylocarpum Allman, 1888
Synthecium carinatum Totton, 1930
Synthecium crassum (Fraser, 1940)
Synthecium cylindricum (Bale, 1888)
Synthecium dentigerum Jarvis, 1922
Synthecium elegans Allman, 1872
Synthecium evansi (Ellis & Solander, 1786)
Synthecium flabellum Hargitt, 1924
Synthecium gordoni Vervoort & Watson, 2003
Synthecium gracilis Coughtrey, 1875
Synthecium hians Millard, 1957
Synthecium maginatum (Allman, 1877)
Synthecium maldivense Borradaile, 1905
Synthecium marginatum (Allman, 1877)
Synthecium megathecum Billard, 1924
Synthecium orthogonium (Busk, 1852)
Synthecium patulum (Busk, 1852)
Synthecium protectum Jäderholm, 1903
Synthecium rigidum Fraser, 1938
Synthecium samauense Billard, 1925
Synthecium samuense Billard, 1925
Synthecium subventricosum Bale, 1914
Synthecium symmetricum Fraser, 1938
Synthecium tottoni Ralph, 1958
Synthecium tubiger Borradaile, 1905
Synthecium tubithecum (Allman, 1877)
