|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was assigned to Sachitida by Sepkoski (2002); to Halwaxida by Conway Morris and Caron (2007); and to Siphogonuchitidae by Parkhaev and Demidenko (2010).
|Year||Name and author|
|1980||Sachitelus intercostatus Jiang|
|1980||Trapezochites chordoides Jiang figs. Pl. 3, figs. 3, 7, 16|
|1982||Trapezochites Qian and Yiang|
|2002||Siphogonuchites Sepkoski, Jr.|
|2007||Siphogonuchites Conway Morris and Caron p. 1258|
|2010||Siphogonuchites Parkhaev and Demidenko p. 957|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|P. Y. Parkhaev and Y. Demidenko 2010||"Hollow asymmetrically bent or circinate sclerites with sharp lateral margins. Sclerites narrowing distally. Upper convex side of sclerite bears one or two longitudinal oblique ribs and transversal striation. Lower side well delineated by sharp margins, concave or flattened, it bears faint transversal striation. Cross-section triangular, trapezoid or polygonal in proximal part, changes its shape along sclerite length. Distal end blind, rounded or pointed."|