| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Agnostus tardus
Taxonomy
Battus tardus was named by Barrande (1846).
It was recombined as Trinodus tardus by Barrande (1846) and Kielan (1960); it was recombined as Arthrorhachis tarda by Hall and Corda (1847), Ahlberg (1989); it was recombined as Agnostus tardus by Barrande (1852), Raymond (1925); it was recombined as Arthrorhachis tardus by Hoel (1999).
It was recombined as Trinodus tardus by Barrande (1846) and Kielan (1960); it was recombined as Arthrorhachis tarda by Hall and Corda (1847), Ahlberg (1989); it was recombined as Agnostus tardus by Barrande (1852), Raymond (1925); it was recombined as Arthrorhachis tardus by Hoel (1999).
Sister species lacking formal opinion data