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Macrochelys temminckii (Alligator snapping turtle)
Taxonomy
Macroclemys temminckii was named by Troost (1835). It is extant. It is the type species of Macrochelys.
It was recombined as Macrochelys temminckii by Hay (1930), Knauss et al. (2011), Thomas et al. (2014), van Dijk et al. (2014) and Rhodin et al. (2017).
It was recombined as Macrochelys temminckii by Hay (1930), Knauss et al. (2011), Thomas et al. (2014), van Dijk et al. (2014) and Rhodin et al. (2017).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1835 | Macroclemys temminckii Troost |
| 1857 | Gypochelys lacertina Agassiz |
| 1930 | Macrochelys temminckii Hay p. 85 |
| 1978 | Macroclemys temminckii Whetstone p. 161 |
| 1981 | Macroclemys temmincki Clarke p. 59 |
| 2011 | Macrochelys temminckii Knauss et al. |
| 2014 | Macrochelys temminckii Thomas et al. |
| 2014 | Macrochelys apalachicolae Thomas et al. p. 151 figs. 13-14 |
| 2014 | Macrochelys temminckii van Dijk et al. |
| 2017 | Macrochelys temminckii Rhodin et al. |
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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.
Macrochelys temminckii Troost 1835 [Alligator snapping turtle]
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Invalid names: Gypochelys lacertina Agassiz 1857 [synonym], Macrochelys apalachicolae Thomas et al. 2014 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. M. Thomas et al. 2014 | Carapacial caudal notch narrow and triangular or U-shaped, contained wholly on the pygal and not extending onto peripheral set 11, and pygal with two serrations and without medial suture; Peripheral 11 with 1 serration; pleural scute set 1 does not overlap onto the nuchal; distal rib end of costal 1 enters middle of peripheral 3; posterior projection of the squamosal globular and obtusely angled in lateral aspect, usually upwardly inflected; dermal scale on the frontals reduced in size; processus trochlearis oticum relatively straight with a single distal protuberance; posterior margin of squamosal-opisthotic contact relatively straight in dorsal aspect; mandible relatively narrow with slender triturating surfaces. Although generally the caudal notch is small and triangular, observable variation occurs within the species. | |
| T. M. Thomas et al. 2014 (Macrochelys apalachicolae) | Macrochelys apalachicolae is distinguished by the following: carapacial caudal notch narrow and triangular or narrow and U-shaped (Figure 13), relatively shallow, and reduced; posterior projection of the squamosal globular and obtusely angled in lateral aspect (Figure 5,14); pygal with two serrations, with medial suture; peripheral 11 with one serration; distal rib end of costal 1 enters posterior third of peripheral 3; pleural scute set 1 with slight to no overlap onto the nuchal; processus trochlearis oticum relatively straight with a single distal protuberance; posterior margin of squamosal-opisthotic contact relatively straight in dorsal aspect. |
Measurements
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Ernst and Barbour 1989 | |||||
Age range: base of the Late/Upper Hemphillian to the top of the Rancholabrean or 10.30000 to 0.01200 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Hemphillian | USA (Nebraska) | Macroclemys temmincki (18126) | |
| Blancan | USA (Kansas) | Macroclemys temmincki (19940) | |
| Blancan | USA (Florida) | Macroclemys temmincki (19753 19764) | |
| Irvingtonian | USA (Florida) | Macroclemys temmincki (20400 20402) | |
| Rancholabrean | USA (Florida) | Macroclemys temmincki (20440) | |
| Late/Upper Pleistocene (glacial) | USA (Mississippi) | Macrochelys temminckii (164396) |