Agmata

Agmata
Temporal range: Early Cambrian–Middle Cambrian
Scientific classification
Kingdom:Animalia (?)
Phylum:†Agmata
Yochelson, 1977[1]
Families

Salterellidae

Agmata is a proposed extinct phylum of animals with a calcareous conical shell, previously thought to be cephalopods or annelid worms. The phylum's name comes from the Greek word for "fragments", referring to the fine fragments and grains that partially fill these shells.[1] It was proposed by Ellis L. Yochelson in 1977 to house the agglutinating Early Cambrian fossils Salterella and Volborthella, with the Middle Cambrian Ellisell yochelsoni later included.[2]

Currently, the phylum contains only one family, Salterellidae; a second family, Volborthellidae, was originally included but later became a synonym of the former. No orders, classes or superfamilies are used within the phylum, despite the order "Volborthellida" being previously proposed for Volborthella before the phylum's own proposal. The reasoning for this was that taxa of these ranks were not seen as necessary in a phylum with very few genera.[1][3]

See also

  • Vologdinella – a Middle Cambrian fossil genus with superficial resemblance to Agmatans

References

  1. 1 2 3 Yochelson, Ellis L. (1977). "Agmata, a Proposed Extinct Phylum of Early Cambrian Age". Journal of Paleontology. 51 (3): 437–454. JSTOR 1303675.
  2. ↑ Peel, John S. (2016). "Anatase and Hadimopanella selection by Salterella from the Kap Troedsson formation (Cambrian Series 2) of North Greenland". GFF. 139 (1): 70–74. doi:10.1080/11035897.2016.1227365.
  3. ↑ Yochelson, Ellis L.; Kisselev, Gennadii N. (2003). "Early Cambrian Salterella and Volborthella (Phylum Agmata) re‐evaluated". Lethaia. 36 (1): 8–20. doi:10.1080/00241160310001254.


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