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Georgiacetus
Taxonomy
Georgiacetus was named by Hulbert et al. (1998) [Sepkoski's age data: T Eo-m]. It was considered monophyletic by Uhen (2008).
It was assigned to Basilosauridae by Fordyce and de Muizon (2001); to Cetacea by Sepkoski (2002); to Pappocetinae by McLeod and Barnes (2008); to Protocetinae by Uhen (2001) and Uhen (2008); to Georgiacetinae by Gingerich et al. (2005), Uhen (2008) and Gao and Ni (2015); and to Protocetidae by Hulbert et al. (1998), Geisler and Sanders (2003), Uhen et al. (2011), Bianucci and Gingerich (2011), Uhen (2014), Uhen (2014), Marx et al. (2016) and Berta (2017).
It was assigned to Basilosauridae by Fordyce and de Muizon (2001); to Cetacea by Sepkoski (2002); to Pappocetinae by McLeod and Barnes (2008); to Protocetinae by Uhen (2001) and Uhen (2008); to Georgiacetinae by Gingerich et al. (2005), Uhen (2008) and Gao and Ni (2015); and to Protocetidae by Hulbert et al. (1998), Geisler and Sanders (2003), Uhen et al. (2011), Bianucci and Gingerich (2011), Uhen (2014), Uhen (2014), Marx et al. (2016) and Berta (2017).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1998 | Georgiacetus Hulbert et al. p. 911 |
| 2001 | Georgiacetus Fordyce and de Muizon p. 186 |
| 2001 | Georgiacetus Uhen p. 136 |
| 2002 | Georgiacetus Sepkoski |
| 2003 | Georgiacetus Geisler and Sanders p. 27 |
| 2005 | Georgiacetus Gingerich et al. p. 200 |
| 2008 | Georgiacetus McLeod and Barnes p. 85 |
| 2008 | Georgiacetus Uhen p. 560 |
| 2011 | Georgiacetus Bianucci and Gingerich p. 1174 |
| 2011 | Georgiacetus Uhen et al. p. 966 figs. Figure 10 |
| 2014 | Georgiacetus Uhen p. 211 |
| 2015 | Georgiacetus Gao and Ni p. 156 figs. Table 1 |
| 2016 | Georgiacetus Marx et al. p. 100 |
| 2017 | Georgiacetus Berta p. 159 |
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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. †Georgiacetus Hulbert et al. 1998
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†Georgiacetus vogtlensis Hulbert et al. 1998
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. D. Gingerich et al. 2005 | Georgiacetines, like protocetines, have generalized skulls retaining three incisors in the premaxilla and three molars in the maxilla. Most or all have a derived, reduced pelvic girdle, with the sacrum consisting of a single centrum with or without substantial auricular processes that articulated with the ilia of the innominates. Hind limbs are not yet known, but reduction of the sacrum suggests that these were probably reduced as well. Georgiacetus itself appears not to have had a distinct sacral vertebra, and the ilium of the preserved innominate shows no evidence of articulation with an auricular process (Hulbert et al., 1998). Locomotion was probably powered more by the tail than the feet. | |
| M. D. Uhen 2008 | Similar in size to Babiacetus, but larger than Protocetus, Rodhocetus, Takracetus, Gaviacetus and Indocetus, and smaller than Eocetus, Natchitochia, and Pappocetus. Georgiacetus lacks a synarthrotic connection between the innominate and the vertebral column, which is present in Protocetus, Rodhocetus, Gaviacetus, and Natchitochia (Hulbert et al., 1998). |