Basic info | Taxonomic history | Classification | Included Taxa |
Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Asthenoceras
Taxonomy
Asthenoceras is a genus. It is not extant. Its type is Grammoceras nannodes.
It was assigned to Grammoceratinae by Westermann (1969); to Ammonoidea by Sepkoski (2002); and to Witchelliinae by Howarth (2013).
It was assigned to Grammoceratinae by Westermann (1969); to Ammonoidea by Sepkoski (2002); and to Witchelliinae by Howarth (2013).
Species
Synonymy list
Year | Name and author |
---|---|
1969 | Asthenoceras Westermann p. 58 |
2002 | Asthenoceras Sepkoski |
2013 | Asthenoceras Howarth p. 119 |
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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
part | N | mean | minimum | maximum | median | s.d. | |
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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: base of the Concavum to the top of the Early/Lower Bajocian or 175.60000 to 168.40000 Ma
Collections (12 total)
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Concavum | Morocco | A. sp. (141208 141211 141215 141217 141223 141225) | |
Early/Lower Bajocian | USA (Alaska) | A. nannodes (175668) | |
Early/Lower Bajocian | USA (Oregon) | A. delicatum (202846) | |
Discites | Morocco | A. sp. (141227 141231 141233 141236) |