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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Sonninia (Alaskoceras) alaskensis
Taxonomy
Sonninia (Alaskoceras) alaskensis was named by Westermann (1969). Its type specimen is McM J 1021, a shell, and it is a 3D body fossil. Its type locality is Westermann WA10, Wide Bay (scree), which is in a Bajocian marine shale in the Kialagvik Formation of Alaska.
It was recombined as Sonninia (Alaskinia) alaskensis by Westermann (1978).
It was recombined as Sonninia (Alaskinia) alaskensis by Westermann (1978).
Synonymy list
| Year | Name and author |
|---|---|
| 1969 | Sonninia (Alaskoceras) alaskensis Westermann p. 103 figs. Pl 27, figs 2-7; text-figs 32,33 |
| 1978 | Sonninia (Alaskinia) alaskensis Westermann p. 604 |
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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.
†Sonninia (Alaskoceras) alaskensis Westermann 1969
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 4 | 17.1 | 10.4 | 23.8 | 18.6 | 5.55 | |
| shell diameter | 4 | 55.1 | 30.0 | 88.0 | 59.0 | 23.7 | |
| shell inflation | 4 | 25.7 | 12.6 | 44.0 | 28.1 | 12.9 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Early/Lower Bajocian or 171.60000 to 168.40000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Bajocian | USA (Alaska) | Sonninia alaskensis (175614 type locality: 175648 175650 175651 175652 175664) |