Weeksina ✝
| Description | Weeksina is a genus of trilobites, an extinct group of marine arthropods. It lived during the Dresbachian faunal stage of the late Cambrian Period which lasted from 501 to 490 million years ago. Its calcified dorsal 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), and the second pair of furrows from the back on the raised central part of the headshield (or 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. From Wikipedia article at https://en.wikipedia.org/wiki/Weeksina, which is released under the Creative Commons Attribution-Share-Alike License 3.0. | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Source Data |
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| Rank | genus | ||||||||||||||||||||||||||||||||||||||||||||||||
| Taxonomy (GBIF,PBDB) | Life : Animalia : Arthropoda : Trilobita : Ptychopariida : Lonchocephalidae : Weeksina | ||||||||||||||||||||||||||||||||||||||||||||||||
| Taxonomic Status (GBIF) | accepted | ||||||||||||||||||||||||||||||||||||||||||||||||
| Classification (PBDB,GBIF) |
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| Scientific Name | Weeksina Resser, 1935 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Name Published In | Smithson. Misc. Coll., 93 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Opinions (PBDB) |
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| Status (PBDB) | extinct | ||||||||||||||||||||||||||||||||||||||||||||||||
| Taxon Size (PBDB) | 3 | ||||||||||||||||||||||||||||||||||||||||||||||||
| First Recorded Appearance | 501 - 485 Ma Cambrian | ||||||||||||||||||||||||||||||||||||||||||||||||
| Last Recorded Appearance | 501 - 485 Ma Cambrian | ||||||||||||||||||||||||||||||||||||||||||||||||
| Environment | marine (based on Trilobita) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Motility | fast-moving (based on Trilobita) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Vision | well-developed (based on Lonchocephalidae) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Diet | carnivore (based on Trilobita) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Ontogeny | molting,addition of parts (based on Trilobita) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Taphonomy | low Mg calcite, chitin (based on Trilobita) | ||||||||||||||||||||||||||||||||||||||||||||||||
| Primary Reference (PBDB) | C. E. Resser. 1935. Nomenclature of some Cambrian trilobites. Smithsonian Miscellaneous Collections 93(5):1-46 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Wikipedia | https://en.wikipedia.org/wiki/Weeksina |
Fossil Distribution
Subtaxa
| Name | Status | Common Name(s) | Fossil Occurrences | Oldest | Youngest |
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| Weeksina granulatus ✝ species | listed (PBDB) | ||||
| Weeksina rara species | accepted (GBIF) | No associated record in PBDB | |||
| Weeksina snowyensis species | accepted (GBIF) | No associated record in PBDB | |||
| Weeksina unispinus ✝ species | listed (PBDB) | ||||
Synonymy List
| Year | Name and Author |
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| 1935 | Weeksina Resser p. 45 |
| 2002 | Weeksina Jell and Adrain p. 459 |
| 2002 | Weeksina Sepkoski, Jr. |
References
