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Lambdaconus
Taxonomy
Lambdaconus was named by Ameghino (1897). Its type is Lambdaconus suinus.
It was considered a nomen vanum by Simpson (1967).
It was assigned to Phenacodontidae by Ameghino (1897); to Didolodidae by Scott (1913); and to Proterotheriidae by Soria (2001), Kramarz and Bond (2005).
It was considered a nomen vanum by Simpson (1967).
It was assigned to Phenacodontidae by Ameghino (1897); to Didolodidae by Scott (1913); and to Proterotheriidae by Soria (2001), Kramarz and Bond (2005).
Species
Entered
by D. Croft on 2006-03-31; modified by J. Carrillo on 2018-03-06
Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Lambdaconus Ameghino p. 439 |
| 1913 | Lambdaconus Scott p. 489 |
| 2001 | Lambdaconus Soria |
| 2005 | Lambdaconus Kramarz and Bond p. 617 |
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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. †Lambdaconus Ameghino 1897
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†Lambdaconus inaequifacies Ameghino 1904
†Lambdaconus lacerum Ameghino 1902
†Lambdaconus suinus Ameghino 1897
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. F. Soria 2001 | De tamaño menor a comparable al de Proterotherium cervioides. Molariformes bunoselenodontes y con el grado de braquiodoncia propio de las especies oligocenas. Como en éstas, P3-4 sin hipocono y con fuerte cingulo posterolingual; con metacónulo menos reducido que en Proterotherium. Molares superiores con estilos labiales débiles y pliegues del paracono y metacono bien marcados, como en otros Proterotheriidae oligocenos. M2-3 con o sin metacónulo (L. suinus). M3 con hipocono muy poco desarrollado, asociado a un fuerte cingulo postero-lingual. p4-m3 sin paracónido, como en otros Proterotheriidae oligocenos. ml-3 con entocónido proporcionalmente mayor que en otras especies. Hipoconúlido del m3 bien robusto. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Ji et al. 2002, MacFadden et al. 1996, Lillegraven 1979 | |||||
Age range: base of the Casamayoran to the top of the Burdigalian or 56.00000 to 15.98000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Casamayoran | Argentina (Chubut) | L. suinus (176285) | |
| Deseadan | Argentina (Mendoza) | L. suinus (176466) | |
| Burdigalian | Argentina (Santa Cruz) | L. lacerum (59319) |