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Peligrochelys walshae
Taxonomy
Peligrochelys walshae was named by Sterli and de la Fuente (2013). Its type specimen is MACN-PV CH 2017, a partial skull, and it is a 3D body fossil. Its type locality is Punta Peligro, which is in a Danian mire/swamp claystone/conglomerate in the Salamanca Formation of Argentina.
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Peligrochelys walshae Sterli and de la Fuente |
| 2014 | Peligrochelys walshae de la Fuente et al. |
| 2015 | Peligrochelys walshae Sterli |
| 2019 | Peligrochelys walshae Sterli and de la Fuente |
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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.
†Peligrochelys walshae Sterli and de la Fuente 2013
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Sterli 2015 | Peligrochelys walshae is differentiated from other meiolaniforms by the unique combination of the following features (autapomorphies marked with asterisks): scutes cover the skull roof, presence of several F scutes surrounding the orbit, posterior wall separating the fossa orbitalis from the fenestra temporalis inferior, small knobs in the squamosal, processus trochlearis oticum present, cavum tympani well developed, only one opening for the exit of the nervi hypoglossi (XII) in the exoccipital*, thick basicranium, roughened area in the basisphenoid, two concavities in the basioccipital delimited by the well-developed tubera basioccipitalis*, foramina carotici cerebralis posterior located close together, foramen posterior canalis carotici interni absent and union of foramen carotici cerebralis anterior forming a slit* | |
| J. Sterli and M. S. de la Fuente 2019 | It is also a member of the Meiolaniformes showing the unique combination of the following characters (autapomorphies are marked with asterisks): skull roof covered by scales; presence of XY scale*; pentagonal frontal; presence of a posterior wall separating the fossa orbitalis from the fenestra temporalis inferior; jugal forming part of the triturating surface; cheek not emarginated; quadratojugal forming the anteroventral rim of the cavum tympani; presence of a processus trochlearis oticum; cavum tympani well developed; thick basicranium; presence of two concavities in the basioccipital delimited by the well-developed tubera basioccipitalis*; foramina carotici cerebralis posterior located close together; absence of a foramen posterior canalis carotici interni; foramen carotici cerebralis anterior united forming a slit*; paired pits present in the basisphenoid and developing posteriorly reaching the basioccipital; long symphysis in the dentary; only labial and lingual ridges present in dentary; no ridges in the triturating surface of the symphysis; fused postdentary bones; short processus retroarticularis; nuchal notch reaching peripheral 1; formed cervical and caudal vertebrae; two sacral vertebrae, which formula is)sa1| |sa2(; differs from Ka. bajazidi and Naomichelys speciosa Hay, 1908 because of anterior caudal vertebrae are opisthocoelous and the posterior caudal vertebrae are procoelous, and due to the shape of the basioccipital. It can be distinguished from Patagoniaemys gasparinae Sterli and de la Fuente, 2011b, Mongolochelys efremovi Khosatzky, 1997, Chubutemys copelloi Gaffney et al., 2007, and Niolamia argentina, Ameghino, 1899 by the presence of a short anterior process of postorbital forming the posteriormost margin of the orbit. Peligrochelys walshae shares with Pa. gasparinae and Mo. efremovi the presence of a wide and short, trapezoidal nuchal. |
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: Danian or 66.00000 to 61.60000 Ma
Collections (21 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Danian | Argentina (Chubut) | Peligrochelys walshae (type locality: 95914 200060 200061 200062 200063 200064 200065 200066 200067 200068 200069 200070 200071 200072 200073 200074 200075 200076 200077 200078 208464) |