Marginal Wood Fern – Dryopteris marginalis

by | Dec 9, 2023 | Ferns, NE Native Ferns

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Archaeonectrus is an extinct genus of pliosaur from the Early Jurassic (Sinemurian) of what is now southeastern England. The type species is Archaeonectrus (originally "Plesiosaurus") rostratus, first named by Sir Richard Owen in 1865, which was moved to its own genus by N.I. Novozhilov in 1964. It was a relatively small plesiosaur, measuring 3.4–3.67 m (11.2–12.0 ft) long.[1][2]

Additional specimen

Classification

Illustration of the holotype specimen, NHMUK PV OR 38525 (formerly BMNH 38525), dated to c. 1870
Life restoration

The cladogram below shows Archaeonectrus phylogenetic position among other plesiosaurs, following Benson et al. (2012).[3]

Plesiosauria 

See also

References

  1. ^ Ketchum, H. F.; Smith, A. S. (2010). "The anatomy and taxonomy of Macroplata tenuiceps (Sauropterygia, Plesiosauria) from the Hettangian (Lower Jurassic) of Warwickshire, United Kingdom" (PDF). Journal of Vertebrate Paleontology. 30 (4): 1069–1081. doi:10.1080/02724634.2010.483604. S2CID 85081282.
  2. ^ Valentin Fischer; Nikolay G. Zverkov; Maxim S. Arkhangelsky; Ilya M. Stenshin; Ivan V. Blagovetshensky; Gleb N. Uspensky (2020). "A new elasmosaurid plesiosaurian from the Early Cretaceous of Russia marks an early attempt at neck elongation". Zoological Journal of the Linnean Society. 192 (4): 1167–1194. doi:10.1093/zoolinnean/zlaa103. hdl:2268/251614.Supplementary Information
  3. ^ 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.
  • Sepkoski, J.J. (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 363: 1-560.

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