|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Helcionelloida - Helcionellida - Trenellidae
It was assigned to Cyrtonellida by Bengtson (1992); to Helcionelloida by Landing and Bartowski (1996); to Mollusca by Sepkoski (2002); to Helcionellidae by Bengtson et al. (1990), Runnegar (1990), Skovsted (2004) and Wotte (2006); and to Trenellidae by Parkhaev (2002), Parkhaev (2005) and Wagner (2017).
|Year||Name and author|
|1990||Mackinnonia Bengtson et al.|
|1990||Mackinnonia Runnegar p. 233|
|1992||Mackinnonia Bengtson p. 1027|
|1996||Mackinnonia Landing and Bartowski p. 754|
|2002||Mackinnonia Parkhaev p. 35|
|2002||Mackinnonia Sepkoski, Jr.|
|2004||Mackinnonia Skovsted p. 15|
|2006||Mackinnonia Wotte p. 151|
|2017||Mackinnonia Wagner p. G910|
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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.