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Isometremys lacuna
Taxonomy
Isometremys lacuna was named by Chow and Yeh (1962). Its type specimen is IVPP V 1049 and is a mold. Its type locality is Maoming Basin, which is in a Lutetian/Bartonian lacustrine - large shale in the Youganwo Formation of China. It is the type species of Isometremys.
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Isometremys lacuna Chow and Yeh |
| 2008 | Isometremys lacuna Brinkman et al. p. 82 |
| 2012 | Isometremys lacuna Claude 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.
†Isometremys lacuna Chow and Yeh 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Claude et al. 2012 | Geoemydid turtle of medium size
(adult carapace length varying from 25 to 35 cm). Differs from all other geoemydid taxa by the following combination of characters: a central carina can be present from the fifth neural to the first suprapygal, while a weak lateral carina can be present close to the vertebral scutes; wide neurals (as wide as long second to fourth neurals, wider than long fifth to eigth neurals), hexagonal in shape, with short anterolateral sides; rather short first costal reaching the posterior end of the third peripheral or the anterior end of the fourth peripheral; first vertebral scute trapezoidal in shape, covering part of the first peripheral; anterior marginals covering most of the peripheral plates but not reaching the costal plates; hexagonal second and third vertebrals, slightly wider anteriorly than posteriorly; sulcus between the second and third pleural scute oblique, close to the posterior margin of the fourth costal plate laterally; carapace sutured to the plastron by a long bridge; inguinal process contacting the lateral half of the fifth and sixth costal plates; anterior plastral lobe shorter than the posterior lobe, with slightly notched anterior border; well developed epiplastra, with long interepiplastral suture which is nearly as long as the hyo-epiplastral suture; epiplastral lip present, but flat and not prominent; rhomboid entoplastron intersected by the gularohumeral sulcus on its anterior quarter, and by the humeropectoral sulcus close to its posterior end; pectoral scute nearly as long as the abdominal scute; anal notch well developed; well developed visceral lips under the femoral scute on the plastron. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Uetz 2005 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lutetian - Bartonian | China (Guangdong) | Isometremys lacuna (type locality: 167230) |