Ptychagnostus is a member of the agnostida that lived during the Cambrian period. Ptychagnostidae generally do not exceed one centimetre in length. Their remains are rarely found in empty tubes of the polychaete worm Selkirkia. The genus probably ranged throughout the water column. It has two glabellar lobes, and three pygidial lobes.
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| - Ptychagnostus (en)
- Ptychagnostus (uk)
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| - Ptychagnostus is a member of the agnostida that lived during the Cambrian period. Ptychagnostidae generally do not exceed one centimetre in length. Their remains are rarely found in empty tubes of the polychaete worm Selkirkia. The genus probably ranged throughout the water column. It has two glabellar lobes, and three pygidial lobes. (en)
- Ptychagnostus — рід трилобітів родини , що існував у середньому кембрії (508—497 млн років тому). Численні рештки представників роду знаходять в Європі, Азії, Австралії та Північній Америці. (uk)
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| - Ptychagnostus germanus (en)
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synonyms
| - *Triplagnostus (Linnarsson, 1869)
*Huarpagnostus (Rusconi, 1950)
*Solenagnostus (Whitehouse, 1936)
*Pentagnostus (Lermontova, 1940)
*Aristarius (Opik, 1979)
*Aotagnostus (Opik, 1979)
*Acidusus (Opik, 1979)
*Canotagnostus (Rusconi, 1951)
*Zeteagnostus (Opik, 1979) (en)
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| - Ptychagnostus is a member of the agnostida that lived during the Cambrian period. Ptychagnostidae generally do not exceed one centimetre in length. Their remains are rarely found in empty tubes of the polychaete worm Selkirkia. The genus probably ranged throughout the water column. It has two glabellar lobes, and three pygidial lobes. (en)
- Ptychagnostus — рід трилобітів родини , що існував у середньому кембрії (508—497 млн років тому). Численні рештки представників роду знаходять в Європі, Азії, Австралії та Північній Америці. (uk)
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