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Larachelus morla
Taxonomy
Larachelus morla was named by Pérez-García and Murelaga (2012). Its type specimen is MDS-MPBS-6, a set of postcrania, and it is a 3D body fossil. Its type locality is Monte Puente Ballesta site, Salas de los Infantes, which is in a Hauterivian/Barremian fluvial horizon in the Pinilla de los Moros Formation of Spain.
Synonymy list
| Year | Name and author |
|---|---|
| 2012 | Larachelus morla Pérez-García and Murelaga p. 1295 figs. 2-4 |
| 2013 | Larachelus morla Pérez-García and Murelaga |
| 2017 | Larachelus morla Pérez-García |
| 2022 | Larachelus morla Obraztsova 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.
†Larachelus morla Pérez-García and Murelaga 2012
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Pérez-García and X. Murelaga 2012 | Pan-cryptodiran turtle belonging to the node that groups the common ancestor of Xinjiangchelys latimarginalis and Cryptodira, and all its descendants, sharing with the basal members of this node (node D in Fig. 5A–B): anal scutes anteromedially overlapping the hypoplastra. Larachelus morla has the following autapomorphies: partially ligamentous epiplastrahyoplastra and hypoplastra-xiphiplastra contacts, with a linear ridge in the anterior margin of the hyoplastra and posterior margin of the hypoplastra that slots into a furrow in the posterior margin of the epiplastra and anterior margin of the xiphiplastra, respectively. It differs from other members of Pan-Cryptodira by the following character combination: high shell; broad plastral lobes; smooth outer surface; absence of fontanelles; six neurals; hexagonal and elongated fourth and fifth neurals (at least); subrounded last neural; medial contact of the last three pairs of costals; robust distal region of the dorsal ribs; single, large, and pentagonal suprapygal; slight thickening of the dorsolateral region of the anterior and middle peripherals; high bridge peripherals; long posterior peripherals and pygal; third vertebral scute significantly wider than the fourth and fifth ones; posterior margin of third and fourth vertebrals medially directed toward the posterior region; fifth vertebral as wide as the suprapygal; last pair of marginals overlapping onto the posterior region of the suprapygal; marginal scutes not contacting the costal plates except in those in the middle region of the peripheral series; epiplastra slightly wider than long, with much of their visceral surface depressed, and lacking dorsal processes; epiplastrahyoplastra suture laterally directed to the anterior region; rhombic, relatively small, and longer than wide entoplastron; partially ligamentous carapace-plastron connection; absence of mesoplastra; hyoplastra and hypoplastra only in contact with peripherals; long bridge; laterally sinuous hypoplastra-xiphiplastra contact; absence of plastral kinesis; straight plastral sagittal sulcus; gular scutes superimposed onto the anterior area of the entoplastron; extragular-humeral sulcus laterally directed towards the anterior region; humeral-pectoral sulcus situated far behind the posterior margin on the entoplastron; numerous small inframarginal scutes; and anal scutes anteromedially overlapping the hypoplastra. Larachelus morla differs from the basal members of Cryptodira by: medial contact of the last pairs of costals; presence of extragulars. It differs from Brodiechelys brodiei by: higher shell; smooth outer surface; fewer neurals; more costals with medial contact; single suprapygal; slight thickening of the dorsolateral region of the anterior and middle peripherals; fifth vertebral wider than the fourth one; fourth vertebral longer than wide; marginals overlapping the second suprapygal; partially ligamentous carapace-plastron connection; longer than wide entoplastron; straight plastral sagittal sulcus; and more than four pairs of inframarginals. It differs from Siamochelys peninsularis (sensu Tong et al., 2002) by: absence of mesoplastra; wider third vertebral scute; smooth outer surface; gulars overlapping onto the anterior area of the entoplastron; longer than wide entoplastron; and partially ligamentous carapace-plastron connection. It differs from theAsian taxa attributed to “Xinjianchelyidae” (Tong et al., 2012) by: high shell; single suprapygal; dorsal process of epiplastron absent; posterior sulcus of gulars and extragulars not forming a straight line; gulars overlapping onto the anterior area of the entoplastron; more than four pairs of inframarginals; and straight plastral sagittal sulcus |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Late/Upper Hauterivian to the top of the Early/Lower Barremian or 136.40000 to 125.45000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Hauterivian - Early/Lower Barremian | Spain (Castilla y León) | Larachelus morla (type locality: 135702) |