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Gracilineustes Temporal range: Callovian - Kimmeridgian, 167–155 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Fossil skull of G. leedsi, NHMUK PV R5793, at the Field Museum of Natural History
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauria
Clade:	Pseudosuchia
Clade:	Crocodylomorpha
Clade:	Crocodyliformes
Suborder:	†Thalattosuchia
Family:	†Metriorhynchidae
Subfamily:	†Metriorhynchinae
Genus:	†Gracilineustes Young et al., 2010
Type species
†Gracilineuestes leedsi (Andrews, 1913)
Other species
†G. acutus Lennier, 1887
Synonyms
Metriorhynchus laeve Andrews, 1913

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. It was a small reptile, with G. leedsi measuring 2.25–3.11 m (7.4–10.2 ft) long and G. acutus measuring 3.77 m (12.4 ft) long.

Discovery and species

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

Valid species

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

References

1. ^ Lennier G. 1887. Description des fossiles du Cap de la Hève. Bulletin de la Société Géologique de Normandie, Le Havre 12: 17-98.
2. ^ 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, M.T.; Bell, M.A.; de Andrade, M.B.; Brusatte, S.L. (2011). "Body size estimation and evolution in metriorhynchid crocodylomorphs: implications for species diversification and niche partitioning". Zoological Journal of the Linnean Society. 163 (4): 1199–1216. doi:10.1111/j.1096-3642.2011.00734.x.
4. 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.

v t e Thalattosuchia
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Pseudosuchia Clade: Crocodylomorpha Pseudosuchia see Pseudosuchia Thalattosuchia see below↓ Thalattosuchia
Thalattosuchia Turnersuchus Teleosauroidea Plagiophthalmosuchus Teleosauridae Indosinosuchus Mystriosaurus Teleosaurinae Platysuchus Teleosaurus Aeolodontinae Aeolodon Bathysuchus Mycterosuchus Sericodon Machimosauridae Charitomenosuchus Clovesuurdameredeor Deslongchampsina Macrospondylus Seldsienean Machimosaurinae Andrianavoay Neosteneosaurus Proexochokefalos Machimosaurini Lemmysuchus Machimosaurus Yvridiosuchus Metriorhynchoidea Eoneustes Magyarosuchus Opisuchus Peipehsuchus Pelagosaurus Teleidosaurus Zoneait Metriorhynchidae Metriorhynchinae Gracilineustes Metriorhynchus Thalattosuchus Rhacheosaurini Cricosaurus Maledictosuchus Rhacheosaurus Geosaurinae Neptunidraco Geosaurini Aggiosaurus Dakosaurus Purranisaurus Torvoneustes Tyrannoneustes Geosaurina Geosaurus Ieldraan Plesiosuchina Plesiosuchus Suchodus Nomina dubia Enaliosuchus Neustosaurus Rhamphocephalus Steneosaurus
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• Late Jurassic crocodylomorphs of Europe
• Middle Jurassic crocodylomorphs
• Prehistoric pseudosuchian genera
• Prehistoric marine crocodylomorphs
• Fossil taxa described in 2010
• Middle Jurassic genus first appearances
• Late Jurassic extinctions
• Thalattosuchians
• Oxford Clay
• Prehistoric archosaur stubs
• Jurassic reptile stubs