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Thalassoleon
Taxonomy
Thalassoleon was named by Repenning and Tedford (1977) [Sepkoski's age data: T Mi-u-u T Plio Sepkoski's reference number: 746]. Its type is Thalassoleon mexicanus.
It was assigned to Callorhinae by Muizon (1978); to Carnivora by Sepkoski (2002); to Otariinae by Barnes (1989), Vidal (1991), Kohno (1992), Koretsky and Barnes (2006), Barnes (2008); to Otariidae by Repenning and Tedford (1977), Carroll (1988), McKenna and Bell (1997), Berta (2002), Deméré et al. (2003), Deméré and Berta (2005), Berta (2009), Boessenecker and Churchill (2015), Berta (2017), Berta (2018); and to Otariidae by Berta et al. (2018), Tsuzuku and Kohno (2020).
It was assigned to Callorhinae by Muizon (1978); to Carnivora by Sepkoski (2002); to Otariinae by Barnes (1989), Vidal (1991), Kohno (1992), Koretsky and Barnes (2006), Barnes (2008); to Otariidae by Repenning and Tedford (1977), Carroll (1988), McKenna and Bell (1997), Berta (2002), Deméré et al. (2003), Deméré and Berta (2005), Berta (2009), Boessenecker and Churchill (2015), Berta (2017), Berta (2018); and to Otariidae by Berta et al. (2018), Tsuzuku and Kohno (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1977 | Thalassoleon Repenning and Tedford p. 60 |
| 1978 | Thalassoleon Muizon p. 183 figs. Fig. 4 |
| 1988 | Thalassoleon Carroll |
| 1989 | Thalassoleon Barnes p. 23 |
| 1991 | Thalassoleon Vidal p. 6 |
| 1992 | Thalassoleon Kohno p. 16 |
| 1997 | Thalassoleon McKenna and Bell p. 253 |
| 2002 | Thalassoleon Berta p. 923 |
| 2002 | Thalassoleon Sepkoski |
| 2003 | Thalassoleon Deméré et al. p. 49 figs. Fig. 3.3 |
| 2005 | Thalassoleon Deméré and Berta p. 382 |
| 2006 | Thalassoleon Koretsky and Barnes p. 145 |
| 2008 | Thalassoleon Barnes p. 529 |
| 2009 | Thalassoleon Berta p. 863 |
| 2015 | Thalassoleon Boessenecker and Churchill figs. Fig. 2 |
| 2017 | Thalassoleon Berta p. 156 |
| 2018 | Thalassoleon Berta p. 713 figs. Fig. 2 |
| 2018 | Thalassoleon Berta et al. p. 210 figs. Fig. 5 |
| 2020 | Thalassoleon Tsuzuku and Kohno p. 6 |
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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. †Thalassoleon Repenning and Tedford 1977
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†Thalassoleon inouei Kohno 1992
†Thalassoleon macnallyae Repenning and Tedford 1977
†Thalassoleon mexicanus Repenning and Tedford 1977
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. A. Deméré and A. Berta 2005 | Otariid pinniped with crown of I3 lacking a posterior accessory cusp, simple triangular postcanine teeth that lack anterior accessory cusps but possess variably developed posterior accessory cusps, postcanine teeth without labial cingula, double-rooted P2-M1 and p2-m1, supraspinous fossa lacking a sharply keeled scapular ridge, distal position of the pronator teres muscle attachment on the radius, weakly developed spine on the distal epiphysis of the radius, calcaneum lacking a secondary shelf of the sustentaculum, broad supraorbital processes of the frontals that lack triangular terminations, multiple palatine foramina with deep grooves, and unfused proximal tibia/fibula articulation. |
Measurements
No measurements are available
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| Source: t = tribe, c = class, uc = unranked clade | |||||
| References: Hendy et al. 2009, Nowak 1991, Gingerich 2003, Carreño and Cronin 1993 | |||||
Age range: base of the Messinian to the top of the Piacenzian or 7.24600 to 2.58000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Messinian | Mexico (Baja California) | T. mexicanus (45458) | |
| Messinian | USA (California) | T. macnallyae (59162 152070 152071) T. mexicanus (76007) | |
| Messinian - Zanclean | USA (California) | T. mexicanus (59272) | |
| Messinian - Zanclean | Japan (Chiba) | T. inouei (70006) | |
| Early/Lower Pliocene | Japan (Yamagata) | T. mexicanus (102184) | |
| Zanclean | USA (California) | T. mexicanus (59271) | |
| Piacenzian | USA (California) | T. macnallyae (152072) |