Genevievella

Genevievella
Temporal range: Upper Cambrian
Genevievella granulosa, 18mm
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Clade: †Artiopoda
Class: †Trilobita
Order: †Ptychopariida
Family: †Llanoaspididae
Genus: †Genevievella
Lochman, 1936
Type species
Genevievella neunia
Lochman, 1936
Synonyms

Placosema Opik 1967

Genevievella is a genus of trilobites with a short inverted egg-shaped outline, a wide headshield, small eyes, and long genal spines. The backrim of the headshield is inflated and overhangs the first of the 9 thorax segments. The 8th thorax segment from the front bears a backward directed spine that reaches beyond the back end of the exoskeleton. It has an almost oval tailshield with 5 pairs of pleural furrows. It lived during the Upper Cambrian in what are today Canada and the United States.

Distribution

References

  1. ↑ "†Genevievella Lochmann 1936". Paleobiology Database. Fossilworks. Retrieved 17 December 2021.
  2. ↑ Moore, R.C. (1959). Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha. Treatise on Invertebrate Paleontology. Vol. Part O. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. O301. ISBN 0-8137-3015-5. {{cite book}}: ISBN / Date incompatibility (help)
  3. ↑ Pojeta, J.; Gilbert-Tomlinson, J.; Shergold, J.H. (1977). "Cambrian and Ordovician rostroconch molluscs from Northern Australia". Australian Bureau of Mineral Resources, Geology and Geophysics Bulletin. 171: 1–54. cited in Pete Wagner. "Locality 50. G127*. Glenormiston". Fossilworks. Retrieved 17 December 2021.
  4. ↑ Pratt, B.R. (1992). "Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada". Palaeontographica Canadiana (9): 1–109. cited in Shanan Peters. "Section N - collection N-33". Fossilworks. Retrieved 17 December 2021.
  5. ↑ Tasch, P. (1951). "Fauna and paleoecology of the Upper Cambrian Warrior Formation of central Pennsylvania". Journal of Paleontology. 25 (3): 275–306. cited in Uta Merkel. "Highway No. 322 near Waddle, Bed 11.12". Fossilworks. Retrieved 17 December 2021.
  6. ↑ Sepkoski Jr., J.J. (1998). "Rates of speciation in the fossil record". Philosophical Transactions of the Royal Society of London B: Biological Sciences. 353 (1366): 315–326. doi:10.1098/rstb.1998.0212. PMC 1692211. PMID 11541734. cited in Mike Sommers. "Central Texas, Riley Fm., Texas". Fossilworks. Retrieved 17 December 2021.
  7. ↑ Peng, S.; Robison, R.A. (2000). "Agnostid biostratigraphy across the Middle-Upper Cambrian boundary in Hunan, China". Journal of Paleontology Memoir. 53. cited in Austin Hendy. "Paibi section, bed 37a". Fossilworks. Retrieved 17 December 2021.