Ptychagnostidae
Ptychagnostidae is a family of agnostid trilobites from the 5th Stage to the Paibian Age of the Cambrian (509 to 497 million years ago). The family includes several important index fossils.
| Ptychagnostidae Temporal range: | |
|---|---|
| Ptychagnostus gibbus | |
| Ptychagnostus cuyanus | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | †Trilobita (?) |
| Order: | †Agnostida |
| Superfamily: | †Agnostoidea |
| Family: | †Ptychagnostidae Kobayashi, 1939 |
| Type genus | |
| Ptychagnostus Jaekel, 1909 | |
| Genera | |
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See text | |
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