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Siphogonuchites
Taxonomy
Siphogonuchites was named by Qian (1977) [Sepkoski's age data: ]. It is not extant. Its type is Siphogonuchites triangularis. It is the type genus of Siphogonuchitidae.
It was assigned to Sachitida by Sepkoski (2002); to Halwaxida by Conway Morris and Caron (2007); and to Siphogonuchitidae by Parkhaev and Demidenko (2010) and Kouchinsky et al. (2017).
It was assigned to Sachitida by Sepkoski (2002); to Halwaxida by Conway Morris and Caron (2007); and to Siphogonuchitidae by Parkhaev and Demidenko (2010) and Kouchinsky et al. (2017).
Species
Sachitelus intercostatus, S. bisulcatus, S. equilateralis, S. intermedius, S. pusilliformis, S. subremualis, S. triangularis (syn. Palaeosulcachites irregularis, Palaeosulcachites minus, Palaeosulcachites shipaiensis, Palaeosulcachites biformis, Trapezochites minuta) (type species), Trapezochites chordoides
Species lacking formal opinion data
Synonyms
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Synonymy list
Year | Name and author |
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1977 | Palaeosulcachites Qian |
1977 | Siphogonuchites Qian |
1980 | Sachitelus intercostatus Jiang |
1980 | Trapezochites chordoides Jiang figs. Pl. 3, figs. 3, 7, 16 |
1982 | Trapezochites Qian and Yiang |
2002 | Siphogonuchites Sepkoski |
2007 | Siphogonuchites Conway Morris and Caron p. 1258 |
2010 | Siphogonuchites Parkhaev and Demidenko p. 957 |
2017 | Siphogonuchites Kouchinsky et al. p. 373 |
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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.
G. †Siphogonuchites Qian 1977
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†Siphogonuchites bisulcatus Qian and Yin 1984
†Siphogonuchites equilateralis Qian and Yin 1984
†Siphogonuchites intermedius Qian 1977
†Siphogonuchites pusilliformis Qian 1977
†Siphogonuchites subremualis Bokova 1985
†Siphogonuchites triangularis Qian 1977
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Invalid names: Palaeosulcachites biformis Qian 1977 [synonym], Palaeosulcachites irregularis Qian 1977 [synonym], Palaeosulcachites minus Qian 1984 [synonym], Palaeosulcachites shipaiensis Qian 1984 [synonym], Trapezochites minuta Jiang 1980 [synonym]
Invalid names: Palaeosulcachites Qian 1977 [synonym], Sachitelus intercostatus Jiang 1980 [nomen nudum], Trapezochites Qian and Yiang 1982 [synonym], Trapezochites chordoides Jiang 1980 [nomen nudum]
Diagnosis
Reference | Diagnosis | |
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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." |