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Pachyrhachis information


Pachyrhachis
Temporal range: Late Cretaceous
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Simoliophiidae
Genus: Pachyrhachis
Haas, 1979
Species:
P. problematicus
Binomial name
Pachyrhachis problematicus
Haas, 1979

Pachyrhachis (from Greek: παχύς pakhús, 'thick' and Greek: ῥάχῐς rhákhis, 'spine') is an extinct genus of snake with well developed hind legs known from fossils discovered in Ein Yabrud, near Ramallah, in the central West Bank. It is a relatively small snake, measuring more than 1.5 metres (4.9 ft) long at maximum.[1] Pachyrhachis appears to have been an ancient marine snake; the fossils occur in a marine limestone deposit, and the thickened bone of the ribs and vertebrae would have functioned as ballast to decrease the buoyancy of the animal, allowing it to dive beneath the ancient Cretaceous seas that it once inhabited.

Pachyrhachis is one of three genera of Cenomanian snakes with hindlimbs. Although many modern pythons and boas still retain remnants of legs, in the form of small spurs, the tiny legs of Pachyrhachis included a hip, knee, and ankle joint. Pachyrhachis was originally described by Haas (1979, 1980) who noted it had a puzzling melange of snake and lizard features; its status as an early snake was later confirmed (Caldwell and Lee 1997).

The position of Pachyrhachis within snakes has been debated (e.g. Lee and Scanlon 2002; Rieppel et al. 2003). Pachyrhachis is among the oldest known snakes and retains well-developed hind limbs, suggesting it represented a transitional form linking snakes to marine lizards (Lee and Scanlon 2002), though other studies place Pachyrhachis within the modern snake radiation as stem-Macrostomata (Zaher, 1998; Zaher & Rieppel, 1999).

  1. ^ Bardet, Nathalie (2008). "The Cenomanian-Turonian (late Cretaceous) radiation of marine squamates (Reptilia): the role of the Mediterranean Tethys". Bulletin de la Société Géologique de France. 179 (6): 605–623. doi:10.2113/gssgfbull.179.6.605.

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Pachyrhachis

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the form of small spurs, the tiny legs of Pachyrhachis included a hip, knee, and ankle joint. Pachyrhachis was originally described by Haas (1979, 1980)...

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Ophidia

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lizards. Ophidia was defined as the "most recent common ancestor of Pachyrhachis and Serpentes (modern snakes), and all its descendants" by Lee and Caldwell...

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Haasiophis

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Along with its sister genus Pachyrhachis, Haasiophis does not possess either a sacral rib or vertebrae. Also like Pachyrhachis there is no preserved indication...

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Madtsoiidae

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to be more plesiomorphic than other Cretaceous limbed snakes, such as Pachyrhachis, Haasiophis or Eupodophis, in retaining a sacro-iliac contact and well-developed...

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Najash

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PMID 30718525. Other known fossil snakes with developed hindlimbs, Haasiophis, Pachyrhachis and Eupodophis—all found in marine environments—all lack a sacral region...

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Snake

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connection to the vertebrae. These include fossil species like Haasiophis, Pachyrhachis and Eupodophis, which are slightly older than Najash. This hypothesis...

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Dysoxylum pachyrhache

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Sapindales Family: Meliaceae Genus: Dysoxylum Species: D. pachyrhache Binomial name Dysoxylum pachyrhache Merr. Synonyms Epicharis pachyrhachis (Merr.) Harms...

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Bulbophyllum pinelianum

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name Bulbophyllum pinelianum (A.Rich.) Paul Abel Ormerod 2016 Synonyms Pachyrhachis pineliana A.Rich. Pleurothallis pachyrachis A.Rich. in R.de la Sagra...

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Titanoboa

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Vasuki indicus

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Gigantophis

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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List of marine reptiles

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Ophidia Simoliophiidae: Late Cretaceous Eupodophis Haasiophis Pachyophis Pachyrhachis Palaeophiidae: Late Cretaceous - Eocene Archaeophis Palaeophis Pterosphenus...

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Wonambi

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Pelvic spur

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were three other known species of legged snakes from this time period, Pachyrhachis problematicus, Haasiophis terrasanctus and Eupodophis descouensi, but...

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Eupodophis

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portal List of transitional fossils Other known fossil snakes with legs: Pachyrhachis Haasiophis Najash "Fossilized Snake With Two Legs Found - Science - redOrbit"...

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Pachyophis

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characterized by the presence of hindlimbs and pelvic girdles, as seen in Pachyrhachis (one of the first discovered hind-limbed snakes). Included in the most...

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Simoliophiidae

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Tchernov et al., 2000 Mesophis Bolkay, 1925 Pachyophis Nopcsa, 1923 Pachyrhachis Haas, 1979 Synonyms Pachyophidae Nopcsa, 1923 Pachyophiidae (Nopcsa,...

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Yurlunggur

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Boa blanchardensis

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Madtsoia

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Palaeophis

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Bulbophyllum

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Breda Oncophyllum D.L.Jones & M.A.Clem. Osyricera Blume Oxysepala Wight Pachyrhachis A.Rich. Papulipetalum (Schltr.) M.A.Clem. & D.L.Jones Pedilochilus Schltr...

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Sanajeh

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Waincophis

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Tetrapodophis

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†Euopodophis descouensi †Pachyrhachis problematicus...

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Powellophis

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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Naja romani

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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List of Ardisia species

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oxyphylla Wall. ex A.DC. Ardisia oxystemon Ridl. ex H.R.Fletcher Ardisia pachyrhachis (F.Muell.) F.Muell. Ardisia pachysandra (Wall.) Mez Ardisia palawanensis...

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Chubutophis

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and a sacrum Najash Simoliophiidae Eupodophis Haasiophis Pachyophis Pachyrhachis Madtsoiidae Alamitophis Gigantophis Madtsoia Menarana Nidophis Powellophis...

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