|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Chondrichthyes - Protospinacidae
It was synonymized subjectively with Belemnobatis by Maisey (1976).
It was assigned to Squalidae by Jordan (1963); to Squalomorphii by Sepkoski (2002); to Squaliformes by Adnet et al. (2008); and to Protospinacidae by Woodward (1919), Thies (1983), Underwood (2002), Delsate (2003), Kriwet (2003), Underwood and Ward (2004) and Delsate and Felten (2015).
|Year||Name and author|
|1919||Protospinax Woodward p. 233|
|1963||Protospinax Jordan p. 601|
|1983||Protospinax Thies p. 21|
|2002||Protospinax Sepkoski, Jr.|
|2003||Protospinax Delsate p. 9|
|2003||Protospinax Kriwet p. 591|
|2004||Protospinax Underwood and Ward p. 483|
|2008||Protospinax Adnet et al. p. 717|
|2015||Protospinax Delsate and Felten p. 12|
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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.