Gresslyosaurus
A Late Triassic sauropodomorph dinosaur named after Amanz Gressly.
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Gresslyosaurus is a genus of plateosaurian sauropodomorph dinosaur that lived during the Late Triassic period, approximately 214 to 204 million years ago. Its fossils have been found in France, Germany, Switzerland, and possibly Greenland (though the latter is disputed or unconfirmed). The genus was named in honor of Swiss geologist and paleontologist Amanz Gressly, who discovered the first remains in northern Switzerland around 1840.
Quick Facts
- Taxon
- Gresslyosaurus
- Type Species
- Gresslyosaurus ingens
- Type Species Authority
- Rütimeyer, 1857
Facts from the source article.
Lore & Background
The holotype of Gresslyosaurus ingens, consisting of postcranial remains, was discovered in the Knollenmergel (the Swiss equivalent of the Trossingen Formation) of northern Switzerland around 1840 by Amanz Gressly. No widely recognized additional collection of the holotype occurred between 1915 and 1942. The species was formally named and described by Rütimeyer in 1857, after an earlier attempt to name it 'Dinosaurus gresslyi' in 1856 was deemed a nomen nudum because it appeared only in an abstract.
Other species were later described: G. plieningeri (Huene, 1905) from the Marnes de Châlins Formation of France and the Trossingen Formation of Germany; G. robustus (Huene, 1905) from the Trossingen Formation of Germany; and G. torgeri (Jaeckel, 1911) from a Plateosaurus bonebed in the same German formation. The taxonomy of Gresslyosaurus has been debated: Lydekker (1888) synonymized it with Zanclodon, but von Huene (1908) separated it as a sauropodomorph. Later authors like Galton (1976, 1985, 1986) synonymized it with Plateosaurus, while Moser (2003) and Rauhut et al. (2020) argued for its generic distinctness.
Reader's Guide
Gresslyosaurus occupies a notable but contested position in the study of Late Triassic sauropodomorph dinosaurs. Its remains, discovered across multiple European localities, have contributed to understanding the diversity of early sauropodomorphs in the Norian–Rhaetian interval. The genus has been central to taxonomic debates: while some researchers have considered it a junior synonym of Plateosaurus, others have maintained its validity based on morphological differences. The 2020 description of Schleitheimia further highlighted distinctions between that genus and Gresslyosaurus, suggesting that the latter may represent a distinct lineage. The history of its naming—from the invalid 'Dinosaurus gresslyi' to the formal Gresslyosaurus ingens—illustrates the evolving practices of 19th-century paleontological nomenclature. Additionally, the poignant story of Amanz Gressly, who in his later years suffered hallucinations of transforming into the dinosaur named after him, adds a human dimension to the genus's legacy. Gresslyosaurus thus remains a key taxon for understanding both the paleobiology of Late Triassic sauropodomorphs and the history of paleontology.
Did You Know?
- The name Gresslyosaurus means 'Amanz Gressly's lizard'.
- The holotype of G. ingens was discovered in northern Switzerland around 1840 by Amanz Gressly.
- Gresslyosaurus has been synonymized with Plateosaurus by some authors, but others like Moser (2003) and Rauhut et al. (2020) consider it generically distinct.
Gallery
Frequently Asked Questions
What is Gresslyosaurus?
Gresslyosaurus is a genus of plateosaurian sauropodomorph dinosaur that lived during the Late Triassic, roughly 214 to 204 million years ago. It sits within the sauropodomorph lineage that would later produce the enormous sauropods of the Jurassic.
Who is Gresslyosaurus named after?
The genus honors Swiss geologist and paleontologist Amanz Gressly, who first uncovered the initial remains in northern Switzerland around 1840. The formal name was published by Rütimeyer in 1857 for the type species G. ingens.
What species are recognized within Gresslyosaurus?
Four species have been assigned to the genus: G. ingens, G. plieningeri, G. robustus, and G. torgeri. They were named by different researchers over several decades, from Rütimeyer in 1857 through Jaeckel in 1911.
Where have Gresslyosaurus fossils been found?
Remains have been recovered from sites in France, Germany, and Switzerland, with a possible but unconfirmed occurrence in Greenland. The Swiss material holds special significance as it was the first discovered.
Is Gresslyosaurus considered a valid genus?
Its taxonomic standing is actively debated, as many paleontologists question whether it represents a distinct genus or is simply a junior synonym of Plateosaurus. This ongoing dispute makes it one of the more contentious names in plateosaurian sauropodomorph taxonomy.
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