Cryptosaurus

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Cryptosaurus
Temporal range:
Ma
↓
Femur
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: †Ornithischia
Clade: †Thyreophora
Clade: †Ankylosauria
Genus: †Cryptosaurus
Seeley, 1869
Species:
†C. eumerus
Binomial name
†Cryptosaurus eumerus
Seeley, 1875
Synonyms
  • Cryptodraco eumerus (Seeley, 1875) Lydekker, 1889

Cryptosaurus (meaning "hidden lizard")[1] is a dubious genus of dinosaur known from a partial femur from the Late Jurassic of England. The sole species is Cryptosaurus eumerus.

The femur was found by the

Cambridge University collection, was rather minimal, consisting of the single sentence "On Shelf g is temporarily placed the femur of a Dinosaur from the Oxford Clay, Cryptosaurus eumerus". From this it is sometimes concluded that the name remained a nomen nudum until a full description by Seeley in 1875.[3]

The holotype, CAMSM J.46882,[4] was discovered in the Great Gransden brick pit, in strata of the Ampthill Clay Formation, dating from the upper Oxfordian. The right femur is about 33 centimetres long and has a thick shaft. It belonged to an adult or at least subadult individual, meaning that the species was rather small.

Seeley thought that Cryptosaurus was a relative of

Camptosauridae in 1909. The work of Peter Galton however, showed that Cryptosaurus is an ankylosaurian of unknown affinities.[5] Today it is commonly considered to be a nomen dubium
because of the limited remains.

Cryptosaurus was for a long time known as Cryptodraco, which is an unnecessary replacement name. In 1889,

Cystosaurus Geoffroy, described in 1832).[6]
This was in error, a mistake originally caused by a wrong spelling of Cystosaurus in the French Bibliothèque universelle des sciences, belles-lettres, et arts, and the name Cryptosaurus has precedence.

See also

References

  1. ISBN 978-0-439-78722-2
    . Retrieved 2021-09-30.
  2. ^ H.G. Seeley, 1869, Index to the Fossil Remains of Aves, Ornithosauria, and Reptilia from the Secondary System of Strata, arranged in the Woodwardian Museum of the University of Cambridge. III, Cambridge University Press[page needed]
  3. S2CID 129929352
    .
  4. ^ Photo of Cryptosaurus SM J 46882 – Holotype, archived from the original on 2018-04-28
  5. ^ P.M. Galton, 1983, "Armored dinosaurs (Ornithischia: Ankylosauria) from the Middle and Upper Jurassic of Europe", Palaeontographica Abteilung A 182(1-3): 1-25
  6. S2CID 128586645
    .
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