Tanystropheidae

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Tanystropheidae
Temporal range:
Ma
Skeletal reconstruction of
Tanystropheus longobardicus
Life restoration of Langobardisaurus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Clade: Tanysauria
Family: Tanystropheidae
Gervais, 1858
Genera[4]

Tanystropheidae is an extinct

protorosaurs". They are characterized by their long, stiff necks formed from elongated cervical vertebrae with very long cervical ribs. Members of the group include both terrestrial and aquatic forms. While some tanystropheids were small lizard-like animals, other tanystropheids such as Tanystropheus
were large animals that had necks that were several meters long, longer than the rest of their bodies.

Tanystropheids are known from Europe, Asia (Russia, China, and Saudi Arabia), North America[5] and probably South America (Brazil).[6] The presence of tanystropheids in Europe and China indicate that they lived along much of the coastline of the Tethys Ocean.[7] However, species in western North America are found in terrestrial deposits, suggesting that as a group, tanystropheids were ecologically diverse.[5]

Relationships among tanystropheid species have been difficult to resolve because most specimens were flattened during fossilization and are preserved two-dimensionally. Three-dimensional fossils are known from Europe and North America.[5]

Phylogeny

In

Macrocnemus obristi, Elessaurus gondwanoccidens, Tanytrachelos ahynis, Tanystropheus “conspicuus”, and Raibliania calligarisi) are pruned after the analysis to minimize polytomies:[8]

Archosauromorpha

Jesairosaurus

Protorosaurus

Prolacerta

Tanystropheidae

Macrocnemus bassanii

Macrocnemus fuyuanensis

Langobardisaurus

AMNH FARB 7206

Sclerostropheus

Tanystropheus hydroides

GMPKU P 1527 T. cf. hydroides

Tanystropheus longobardicus

Crocopoda

A later 2024 study grouped Tanystropheidae along with Trachelosauridae in the new clade Tanysauria.[9]

References