Английская Википедия:Aponileus

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Шаблон:Short description Шаблон:Automatic taxobox

Aponileus is an extinct genus of trilobites. Chung-Hung Hu circumscribed the genus in 1963. The genus was once considered a junior subjective synonym of the genus Psephosthenaspis but it is considered to be a distinct genus again. Шаблон:As of, fossils have been found in Greenland, Texas, and Utah. They all date to the Upper Floian (Blackhillsian) within the Ordovician Period.

Taxonomic history

Aponileus was initially circumscribed by Chung-Hung Hu in 1963.Шаблон:Sfn The type species is A. latus, also described by Hu in 1963. The type material was poorly preserved.Шаблон:Sfn Hu initially said that Aponileus is "most like Nileus",Шаблон:Sfn i.e., treating it as a nileid.Шаблон:Sfn Subsequently, this genus received "virtually no mention" in the trilobite literature for many years,Шаблон:Sfn aside from C. P. Hughes's 1979 assessment that two specimens which Lehi F. Hintze had tentatively assigned to Barrandia in 1953Шаблон:Sfn should be placed in Aponileus.Шаблон:Sfn In 2003, Jonathan M. Adrain synonymized Aponileus with Psephosthenaspis, placing it in the family Bathyuridae.Шаблон:Sfn

In 2012, Adrain and Neo E. B. McAdams treated Aponileus as a distinct genus within Bathyuridae.Шаблон:Sfn They also included the species A. glaber,Шаблон:SfnШаблон:Sfn which Christian Poulsen had initially described in the genus Bolbocephalus in 1927. Adrain and McAdams placed five newly described species in Aponilus, namely A. aasei, A. belkaae, A. laikaae, A. strelkaae, and A. ugolekae; they also tentatively assigned a further newly described species to this genus: A.? veterokae.Шаблон:Sfn While they believed the "best supported current hypotheses" was to place it in Aponileus, they acknowledged it is "very different from all other species included in the genus" and hence "assign[ed] the species only with question".Шаблон:Sfn

Various specific epithets are named after Soviet space dogs like Laika,Шаблон:Sfn Belka,Шаблон:Sfn Strelka,Шаблон:Sfn Ugolyok,Шаблон:Sfn and Veterok.Шаблон:Sfn

Phylogeny

In 2012, Adrain and McAdams said they believed that Aponileus was likely related to the "Acidiphorus group", but said that the sister group remained unclear.Шаблон:Sfn While Psephosthenaspis resembles Aponileus, Adrain and McAdams believe they belong to distinct clades.Шаблон:Sfn

Aponileus laikaae is the basal species.Шаблон:Sfn

Distribution

Chronologically, Aponileus is found entirely within the Lower Ordovician, specifically the upper Floian (Blackhillsian).Шаблон:Sfn The genus's type species, A. latus, has found in the El Paso Formation within the Franklin Mountains of west Texas.Шаблон:Sfn A. glaber was found in Washington Land, in northwestern Greenland.Шаблон:Sfn The remaining species, which Adrain and McAdams first described in 2012, are all from the Confusion Range in Millard County, Utah.Шаблон:Sfn

Species

Шаблон:As of, the following species are recognized:[1]

See also

References

Шаблон:Reflist

Works cited

Шаблон:Taxonbar

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  1. ↑ Шаблон:Fossilworks
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