| Hedstroemia | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | † Trilobita |
| Order: | † Proetida |
| Family: | † Proetidae |
| Genus: | † Hedstroemia Pribyl and Vanek, 1978 |
| Type species | |
| Proetus delicatus Hedström, 1923 | |
| Synonyms | |
MilesdavisLieberman, 1994PachyproetusLutke, 1990 Contents | |
Hedstroemia is a genus of trilobites in the order Proetida known from the Silurian period of Europe, Asia, and North America. [1]
The genus Hedstroemia was named in 1978. The type species designated was Hedstroemia delicatus, which had originally been described as Proetus delicatus in 1923. In 1990 the subgenus Pachyproetus was proposed to accommodate a single species, P. pachydermata. In 1994, the genus Milesdavis was proposed based on incomplete fossils consisting of the pygidium (rear segment) of three individuals. [2] The genus was named after musician Miles Davis, and the type species, Milesdavis eldredgei, was named in honor of the paleontologist Niles Eldredge. In 1997, Milesdavis and the subgenus Pachyproetus were recognized as junior synonyms of Hedstroemia, by paleontologist Jonathan Adrain, who regarded the type species of both as ingroup Hedstroemia. [1]
Several species of Hedstroemia are recognized, and other species are questionably assigned to the genus. [1] Species names with the authority in parentheses were originally described as a different genus.
Questionable species
Diacalymene is a genus of trilobite from the order Phacopida, suborder Calymenina. It includes the species D. ouzregui, D. clavicula, D. diademata and D. gabrielsi. It lived in the Ordovician and Silurian periods.
Ronald Pearson Tripp FRSE was a British palaeontologist specializing in trilobites. He was self-taught in palaeontology and became an authority on the taxonomy of the trilobite order Lichida and the trilobite family Encrinuridae.
Sphaerexochus is a genus of trilobite from the Middle Ordovician to Late Silurian of Asia, Australia, Europe, and North America.
Cyphaspis is a genus of small trilobite that lived from the Late Ordovician to the Late Devonian. Fossils have been found in marine strata in what is now Europe, Africa and North America. Various species had a compact body, and a large, bulbous glabellum. Many species had long spines arranged similarly to closely related genera, such as Otarian, Otarionella, Chamaeleoaspis, and Namuropyge.
Balizoma is a genus of trilobites from the family Encrinuridae established by David J. Holloway in 1980. It has only been found in rocks of Silurian age. Its type species, B. variolaris, is currently the only named species of the genus, and is found in England. The neotype of B. variolaris was collected from the Much Wenlock Limestone Formation at Dudley, West Midlands. That specimen was first illustrated in Sir Roderick Impey Murchison's classic book, The Silurian System. B. variolaris was the original "strawberry-headed" trilobite of Dudley, so-named because of its nodular glabellar tubercles, and well known to early trilobite collectors. Additional species were originally assigned to Balizoma, but were subsequently placed in other encrinurine genera.
Avalanchurus is an extinct genus of trilobites from the Silurian period. It was originally described in 1993 as a subgenus of Struszia, and then promoted in 1997 to genus status.
Daytonia is a trilobite in the order Phacopida, that existed during the lower Silurian in what is now the United States. It was described by D. J. Holloway in 1981, and the type species is Daytonia werthneri, which was originally described under the genus Dalmanites by August Foerste in 1885. It also contains the species, Daytonia mekon. The type locality for the genus was the Brassfield Formation, in Ohio.
Delops is a trilobite in the order Phacopida, that existed during the upper Silurian in what is now England. It was described by Rickards in 1964, and the type species is Delops obtusicaudatus, which was originally described under the genus Phacops by Salter in 1849. The type locality was the Middle Coldwell Beds.
Denckmannites is a trilobite in the order Phacopida, that existed during the upper Silurian in what is now the Czech Republic. It was described by Wedekind in 1914, and the type species is Denckmannites volborthi, which was originally described under the genus Phacops by Barrande in 1852. It also contains the species Denckmannites morator, and Denckmannites primaevus. The type locality was the Kopanina Formation.
Encrinuroides is a genus of trilobites in the order Phacopida, that existed during the upper Ordovician in what is now Wales. It was described by Reed in 1931, and the type species is Encrinuroides sexcostata, which was originally described under the genus Cybele by Salter in 1848. It also contains the species, Encrinuroides enshiensis, Encrinuroides insularis, and Encrinuroides rarus. The type locality was in the Sholeshook Limestone Formation.
Eomonarachus is a genus of trilobites in the order Phacopida, that existed during the middle Ordovician in what is now the United States. It was described by Delo in 1935, and the type species is Eomonarachus intermedius, which was originally described under the genus Dalmanites by Walcott in 1877. It also contains the species Eomonorachus divaricatus, which was originally assigned to Calliops by Frederickson in 1964, and was later moved to Estoniops by Shaw in 1974, before being reassessed under its current genus by Ludvigsen in 1978. The type locality was the Decorah Formation in Minnesota.
Frammia is a genus of trilobites in the order Phacopida that existed during the middle and upper Silurian in what is now the Arctic regions of Canada and Russia. It was described by Holtedahl in 1914, and the type species is Frammia dissimilis. That species was subsequently considered to be a synonym of Frammia arctica. The genus also contains the species, F. bachae Adrain & Edgecombe, 1997, F. hyperborea, and F. rossica. The type locality is the Douro Formation of Cornwallis Island in Nunavut, Canadian Arctic.
Kailia is a genus of trilobites in the order Phacopida that existed during the lower Silurian in what is now China. It was described by W. Zhang in 1974, and the type species is Kailia quadrisulcata. The type locality was the Xiushan Formation in Sichuan.
Aayemenaytcheia paragranulata is a Middle Devonian proetid trilobite.
Struszia is a genus of fossil trilobites from the Silurian period, erected in 1993 and named after paleontologist Desmond L. Strusz.
Aulacopleura is a genus of proetid trilobite that lived from the Middle Ordovician to the Middle Devonian. Some authors may classify this group as subgenus Otarion (Aulacopleura). The cephalon is semicircular or semielliptical, with border and preglabellar field. The glabella is short, with or without defined eye ridges connecting it with eyes of variable size. Spines at the rear outer corners of the cephalon are present, typically reaching back to the 2nd to 4th thorax segment. The 'palate' is not connected to the dorsal shield of the cephalon. The cephalon is pitted, or has small tubercles. The thorax has up to 22 segments. The pleural ends are usually rounded. The pygidium is small (micropygous), with an even margin. A. koninckii had a modern type of compound eye.
Arcticalymene is a genus of trilobites found in Silurian-aged marine strata of Arctic Canada and Central Victoria, Australia. The Canadian species are named after each of the Sex Pistols: A. cooki, A. jonesi, A. matlocki, A. rotteni and A. viciousi, all named by Adrain and Edgecombe in 1997.
Bouleia is a genus of trilobites in the order Phacopida which existed during the lower Devonian in what is now Bolivia. It was described by Kozlowski in 1923, and the type species is B. dagincourti, which was originally described under the genus Phacops by Ulrich in 1892. It also contains the species B. sphaericeps, originally described by Kozlowski, also in 1923, as Dereimsia sphaericeps. The type locality was the Icla Formation in Padilla.
Proetus is a genus of proetid trilobite found in Silurian-aged marine strata of Europe.
Mackenziurus is a genus of phacopid trilobites from the Silurian containing several species, including four named after members of the American punk band the Ramones.
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