|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was synonymized subjectively with Phlegethontia linearis by Lund (1978); it was recombined as Phlegethontia longissima by McGinnis (1967), Carroll et al. (1998) and Anderson (2002).
|Year||Name and author|
|1871||Phlegethontia serpens Cope p. 177|
|1875||Dolichosoma longissimum Fritsch|
|1902||Phlegethontia serpens Hay p. 411|
|1948||Phlegethontia mazonensis Gregory p. 636 figs. 1-6; Pl. 1|
|1967||Phlegethontia longissima McGinnis pp. 3, 38|
|1978||Aornerpeton mazonensis Lund p. 62 figs. 8-10|
|1998||Aornerpeton mazonensis Carroll et al. p. 181|
|1998||Phlegethontia longissima Carroll et al. p. 181|
|2002||Phlegethontia longissima Anderson p. 1031 figs. 2-6, 8-11|
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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.