# Weeksina

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Weeksina
> Markdown URL: https://mediated.wiki/source/Weeksina.md
> Source: https://en.wikipedia.org/wiki/Weeksina
> Source revision: 1322435553
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Genus of trilobites

Weeksina Temporal range: Dresbachian PreꞒ Ꞓ O S D C P T J K Pg N [1] Scientific classification Kingdom: Animalia Phylum: Arthropoda Clade: †Artiopoda Class: †Trilobita Order: †Ptychopariida Family: †Lonchocephalidae Genus: †Weeksina Resser, 1935 Species Weeksina unispina (Walcott, 1916) (type) = Asaphiscus unispinus

***Weeksina*** is a [genus](/source/Genus) of [trilobites](/source/Trilobite), an extinct group of [marine](/source/Marine_habitats) [arthropods](/source/Arthropod). It lived during the [Dresbachian](/source/Dresbachian) [faunal stage](/source/Faunal_stage) of the late [Cambrian Period](/source/Cambrian_Period) which lasted from 501 to 490 million years ago. Its calcified [dorsal](/source/Anatomical_terms_of_location#Dorsal_and_ventral) [exoskeleton](/source/Exoskeleton) has an inverted egg-shape. Characteristics of this trilobite are the backward directed spine on the 8th of 10 segment of the articulated middle part of the body (or [thorax](/source/Trilobite#Thorax)), and the second pair of furrows from the back on the raised central part of the headshield (or [cephalon](/source/Trilobite#Cephalon)) called glabella, which curve from inward to fully backward, almost isolating a pair of lobes, just in front of the occipital ring, that is defined by a furrow that crosses the entire width of the glabella. *Weeksina* is known only from the Weeks Formation at North Canyon, House Range, Millard County, Utah.[2]

## References

1. **[^](#cite_ref-Sepkoski_1-0)** [Sepkoski, Jack](/source/Jack_Sepkoski) (2002). ["A compendium of fossil marine animal genera (Trilobita entry)"](http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class). *Bulletins of American Paleontology*. **363**: 1–560. Retrieved 2008-01-12.

1. **[^](#cite_ref-2)** Peters, S.E. (2003). "Evenness, Richness and the Cambrian-Paleozoic Faunal Transition in North-America: An Assemblage-Level Perspective". The University of Chicago: 1–279. {{[cite journal](https://en.wikipedia.org/wiki/Template:Cite_journal)}}: Cite journal requires |journal= ([help](https://en.wikipedia.org/wiki/Help:CS1_errors#missing_periodical)) *cited on* Shannan Peters. ["Weeksina"](https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=21037). *Fossilworks*.

Taxon identifiers Weeksina Wikidata: Q7979544 GBIF: 4634617 IRMNG: 1060124 Open Tree of Life: 5129520 Paleobiology Database: 21037

This trilobite-related article is a stub. You can help Wikipedia by adding missing information.

- [v](https://en.wikipedia.org/wiki/Template:Trilobite-stub)
- [t](/source/Template_talk%3ATrilobite-stub)
- [e](https://en.wikipedia.org/wiki/Special:EditPage/Template:Trilobite-stub)

---
Adapted from the Wikipedia article [Weeksina](https://en.wikipedia.org/wiki/Weeksina) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Weeksina?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.