Basic info | Taxonomic history | Classification | Included Taxa |
Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Xema
Taxonomy
Xema was named by Leach (1819). It is extant. Its type is Larus sabini.
It was assigned to Xemeae by Coues (1862); to Longipennes by Shufeldt (1891); to Larinae by Hay (1930) and Wetmore (1940); and to Laridae by Hay (1902), Smith (2011) and Clements et al. (2017).
It was assigned to Xemeae by Coues (1862); to Longipennes by Shufeldt (1891); to Larinae by Hay (1930) and Wetmore (1940); and to Laridae by Hay (1902), Smith (2011) and Clements et al. (2017).
Species
Synonymy list
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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.
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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Source: subo = suborder, o = order | |||||
References: Benton 1983, Bush and Bambach 2015, Marsh 1875 |
Age range
Maximum range based only on fossils: base of the Late/Upper Pleistocene to the top of the Holocene or 0.12600 to 0.00000 Ma
Minimum age of oldest fossil (stem group age): 0.0117 Ma
Minimum age of oldest fossil (stem group age): 0.0117 Ma
Collections (3 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Late/Upper Pleistocene | USA (Oregon) | X. sabini (176222) | |
Holocene | Canada (Nunavut) | X. sabini (229489) | |
Holocene | Greenland | X. sabini (215521) |