| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Hemiarges extremus was named by Owen (1986). Its type specimen is HM A16153-4, a cephalon/head (cranidium), and it is a mold. Its type locality is H1, which is in a Hirnantian marine sandstone in the High Mains Formation of the United Kingdom.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Hemiarges extremus Owen p. 236 figs. Fig. 2f-l |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Hemiarges extremus Owen 1986
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Aberhan et al. 2004, Harrington et al. 1959, Whittington et al. 1997 | |||||
Age range: Hirnantian or 445.20000 to 443.10000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hirnantian | United Kingdom (Scotland) | Hemiarges extremus (type locality: 181875 181876) |