Meyerasaurus

Meyerasaurus is an extinct genus of rhomaleosaurid known from Holzmaden, Baden-Württemberg of southwestern Germany.[1]

Meyerasaurus
Temporal range: Early Jurassic,
The holotype in the State Museum of Natural History Stuttgart
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: †Sauropterygia
Order: †Plesiosauria
Family: †Rhomaleosauridae
Genus: †Meyerasaurus
Smith & Vincent, 2010
Species:
†M. victor
Binomial name
†Meyerasaurus victor
(Fraas, 1910 [originally Plesiosaurus])
Synonyms

Description
Restoration

Meyerasaurus is known from the holotype SMNS 12478, articulated and complete skeleton which preserved the skull, exposed in ventral view. It has a skull length of 37 centimetres (1 ft 3 in), a body length of 3.35–3.44 m (11.0–11.3 ft) and a body mass of 275 kg (606 lb).[1][2][3] It was collected from the Harpoceras elegantulum-falciferum ammonoid subzones, Harpoceras falcifer zone, of the famous Posidonien-Schiefer lagerstätte (Posidonia Shale), dating to the early Toarcian stage of the Early Jurassic, about 183-180 million years ago.[1]

Etymology

Meyerasaurus was first named by Adam S. Smith and Peggy Vincent in 2010 and the type species is Meyerasaurus victor. It was originally classified as a species of Plesiosaurus, later as the second named species of Thaumatosaurus (defunct name, meaning "wonder reptile") and ultimately as a species of Eurycleidus or Rhomaleosaurus. The generic name honors the German palaeontologist Hermann von Meyer for proposing the generic name Thaumatosaurus.[1]

Classification

The cladogram below shows Meyerasaurus phylogenetic position among other plesiosaurs, following Benson et al. (2012).[4]

Plesiosauria 
 Neoplesiosauria 

Pliosauridae

Plesiosauroidea

 Rhomaleosauridae 

Stratesaurus taylori

Macroplata tenuiceps

Avalonnectes arturi

Eurycleidus arcuatus

Meyerasaurus victor

Maresaurus coccai

Atychodracon megacephalus

Archaeonectrus rostratus

Rhomaleosaurus cramptoni

Rhomaleosaurus thorntoni

Rhomaleosaurus zetlandicus

See also

References
  1. Adam S. Smith; Peggy Vincent (2010). "A new genus of pliosaur (Reptilia: Sauropterygia) from the Lower Jurassic of Holzmaden, Germany" (PDF). Palaeontology. 53 (5): 1049–1063. doi:10.1111/j.1475-4983.2010.00975.x.
  2. Paul, Gregory S. (2022). The Princeton Field Guide to Mesozoic Sea Reptiles. Princeton University Press. p. 94. ISBN 9780691193809.
  3. Smith, A.S. (2007). "Chapter 3 – Material and palaeontological approaches" (PDF). Anatomy and Systematics of the Rhomaleosauridae (Sauropterygia: Plesiosauria) (PDF). pp. 27–58.
  4. Roger B. J. Benson; Mark Evans; Patrick S. Druckenmiller (2012). "High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic Boundary". PLOS ONE. 7 (3): e31838. Bibcode:2012PLoSO...731838B. doi:10.1371/journal.pone.0031838. PMC 3306369. PMID 22438869.


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