Ptychagnostus

Ptychagnostus is an extinct genus of blind trilobite that lived during the Cambrian period, part of the order Agnostida. Ptychagnostidae generally do not exceed ten millimetres in length.[1] Their remains are sometimes found in the otherwise empty tubes of the polychaete worm Selkirkia.[2] It probably lived in the water column. Its major characteristics are lack of eyes, two lobes on the glabella, and three lobes on the pygidium.[3]

Ptychagnostus
Temporal range: Middle Cambrian
Ptychagnostus germanus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Agnostida
Family: †Ptychagnostidae
Genus: †Ptychagnostus
Jaekel, 1909
Synonyms[1]
  • 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

Species
  • Ptychagnostus aculeatus
  • Ptychagnostus akanthodes
  • Ptychagnostus atavus
  • Ptychagnostus cassis
  • Ptychagnostus ciceroides
  • Ptychagnostus cuyanus
  • Ptychagnostus fissus
  • Ptychagnostus germanus
  • Ptychagnostus gibbus
  • Ptychagnostus hybridus
  • Ptychagnostus intermedius
  • Ptychagnostus michaeli
  • Ptychagnostus praecurrens
  • Ptychagnostus punctuosus
  • Ptychagnostus seminula

References
  1. Samuel M. Gon III. "Agnostida Fact Sheet". A Guide to the Orders of Trilobites. Retrieved 18 November 2012.
  2. Brian D. E. Chatterton, Desmond H. Collins & Rolf Ludvigsen (2003). "Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences". In Philip D. Lane, Derek J. Siveter & Richard A. Fortey (ed.). Trilobites and their Relatives: contributions from the third international conference, Oxford 2001. Special Papers in Palaeontology. 70. pp. 157–173. ISBN 978-0-901702-81-4.
  3. Coppold, Murray and Wayne Powell (2006). A Geoscience Guide to the Burgess Shale, p.56. The Burgess Shale Geoscience Foundation, Field, British Columbia. ISBN 0-9780132-0-4.


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