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Temporal range: 167–155 Ma
Callovian - Kimmeridgian
Holotype of G. leedsi, NHMUK PV R3540
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
(unranked): Mesoeucrocodylia
Suborder: Thalattosuchia
Family: Metriorhynchidae
Genus: Gracilineustes
Young et al., 2010

Gracilineustes is an extinct genus of marine crocodyliform that lived in the oceans during the Middle to Late Jurassic. Gracilineustes was a carnivore that spent much, if not all, its life out at sea.

Discovery and species[edit]

Skull and limb of G. leedsi

Fossil specimens referrable to Gracilineustes are known from Middle-Late Jurassic deposits of England and France.[3]

Valid species[edit]

  • G. leedsi: Western Europe (England) of the Middle Jurassic (Callovian);[2] Metriorhynchus laeve is a junior synonym.
  • G. acutus: Western Europe (France) of the Late Jurassic (Kimmeridgian) [1]


  1. ^ a b Lennier G. 1887. Description des fossiles du Cap de la Hève. Bulletin de la Société Géologique de Normandie, Le Havre 12: 17-98.
  2. ^ a b Andrews CW. 1913. A descriptive catalogue of the marine reptiles of the Oxford Clay, Part Two. London: British Museum (Natural History), 206 pp.
  3. ^ Young, Mark T., Brusatte, Stephen L., Ruta, M., Andrade, Marco B. 2009. "The evolution of Metriorhynchoidea (Mesoeucrocodylia, Thalattosuchia): an integrated approach using geometrics morphometrics, analysis of disparity and biomechanics". Zoological Journal of the Linnean Society 158: 801-859.