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Asthenoceras nannodes
Taxonomy
Grammoceras nannodes was named by Buckman (1890). It is the type species of Asthenoceras.
It was recombined as Asthenoceras nannodes by Westermann (1969).
It was recombined as Asthenoceras nannodes by Westermann (1969).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1890 | Grammoceras nannodes Buckman |
| 1969 | Asthenoceras nannodes Westermann p. 61 figs. Pl 14, figs 1-7; text-figs 21a-c |
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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.
†Asthenoceras nannodes Buckman 1890
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 2 | 7.28 | 5.00 | 10.6 | 7.80 | 3.96 | |
| shell diameter | 2 | 22.2 | 15.0 | 33.0 | 24.0 | 12.7 | |
| shell inflation | 2 | 9.01 | 5.80 | 14.0 | 9.90 | 5.80 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Early/Lower Bajocian or 170.90000 to 168.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Bajocian | USA (Alaska) | Asthenoceras nannodes (175668) |