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Lambdoceras
Taxonomy
Lambdoceras was named by Stirton (1967). Its type is Lambdoceras hessei.
It was synonymized subjectively with Prosynthetoceras by Patton (1969), Patton and Taylor (1971) and Patton and Taylor (1973).
It was assigned to Protoceratidae by Stirton (1967), Tedford et al. (1987) and Albright (1999); and to Synthetoceratini by Webb (1981), Prothero (1998), Webb et al. (2003) and Prothero and Ludtke (2007).
It was synonymized subjectively with Prosynthetoceras by Patton (1969), Patton and Taylor (1971) and Patton and Taylor (1973).
It was assigned to Protoceratidae by Stirton (1967), Tedford et al. (1987) and Albright (1999); and to Synthetoceratini by Webb (1981), Prothero (1998), Webb et al. (2003) and Prothero and Ludtke (2007).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1967 | Lambdoceras Stirton pp. 4-5 |
| 1981 | Lambdoceras Webb p. 362 |
| 1987 | Lambdoceras Tedford et al. |
| 1998 | Lambdoceras Prothero p. 435 |
| 1999 | Lambdoceras Albright |
| 2003 | Lambdoceras Webb et al. p. 362 |
| 2007 | Lambdoceras Prothero and Ludtke p. 174 |
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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.
G. †Lambdoceras Stirton 1967
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†Lambdoceras hessei Stirton 1967
†Lambdoceras siouxensis Frick 1937
†Lambdoceras trinitiensis Patton and Taylor 1971
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Prothero 1998, Lillegraven 1979, Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Early/Lower Barstovian to the top of the Hemingfordian or 16.30000 to 15.97000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Miocene | USA (Texas) | Prosynthetoceras trinitiensis (18634) | |
| Hemingfordian | USA (Nebraska) | L. sp. (17952) | |
| Hemingfordian | USA (South Dakota) | L. hessei (17912) | |
| Early/Lower Barstovian | USA (Texas) | Prosynthetoceras trinitiensis (18665) | |
| Early/Lower Barstovian | USA (Nebraska) | Neotragocerus improvisus (17983) Prosynthetoceras siouxensis (17905 17976 17985 18011 18019) |