INVESTIGADORES
MARSICANO Claudia Alicia
artículos
Título:
A new temnospondyl from the Permo-Triassic Buena Vista Formation of Uruguay
Autor/es:
PIÑEIRO, GRACIELA; MARSICANO, CLAUDIA; LORENZO, NORA
Revista:
PALAEONTOLOGY
Editorial:
PALASS
Referencias:
Lugar: London; Año: 2007 vol. 50 p. 627 - 640
ISSN:
0031-0239
Resumen:
A partial skull recovered from conglomerates of the Permo-Triassic Buena Vista Formation in Uruguay
belongs to a new species, Uruyiella liminea gen. et sp. nov.This species is characterized by a broadly triangular skull
with laterally projecting posterior corners, rhytidosteid-like dermal sculpturing, and orbits positioned close to the skull
margin. Uruyiella liminea is distinguished from other temnospondyls by a combination of primitive and derived character
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
with laterally projecting posterior corners, rhytidosteid-like dermal sculpturing, and orbits positioned close to the skull
margin. Uruyiella liminea is distinguished from other temnospondyls by a combination of primitive and derived character
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
Uruyiella liminea gen. et sp. nov.This species is characterized by a broadly triangular skull
with laterally projecting posterior corners, rhytidosteid-like dermal sculpturing, and orbits positioned close to the skull
margin. Uruyiella liminea is distinguished from other temnospondyls by a combination of primitive and derived character
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
Uruyiella liminea is distinguished from other temnospondyls by a combination of primitive and derived character
states, such as the anterior extent of the palatine ramus of the pterygoid, which excludes the ectopterygoid and most
of the palatine from the lateral border of the interpterygoid vacuity, and the absence of both tabular horns and otic notches.
A phylogenetic analysis places Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because Laidleria
Uruyiella and the enigmatic Early Triassic Laidleria in a clade to which we attach
the family name Laidleriidae. The Plagiosauridae and the Laidleriidae form a clade at the base of Dvinosauria, which is
the sister group of a clade that includes Stereospondyli and Archegosauroidea. This result is unexpected because LaidleriaLaidleria
and Plagiosauridae are nested deeply within Stereospondyli in most phylogenies. The sister-group relationship of UruyiellaUruyiella
and Laidleria suggests that a ghost lineage for the latter genus extends down into the earliest Triassic and perhaps
even into the Late Permian, which in turn would suggest survivorship of the Laidleriidae through the Permo-Triassic
extinction event.
even into the Late Permian, which in turn would suggest survivorship of the Laidleriidae through the Permo-Triassic
extinction event.
Laidleria suggests that a ghost lineage for the latter genus extends down into the earliest Triassic and perhaps
even into the Late Permian, which in turn would suggest survivorship of the Laidleriidae through the Permo-Triassic
extinction event.