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Ichthyosaurs of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Ichthyosaurus I. larkini[1] Somerset Unknown, possibly Pre-planorbis beds Holotype: BRSUG 25300, referred: AGC 11, CAMSM J5957, NHMUK PV OR5595
I. somersetensis[1] Holotype: ANSP 15766 referred: BRSMG Cb4997, NHMUK PV OR2013AGC 16, ROM 26029
Leptonectes L. tenuirostris Southam Cement Works, Warwickshire Wilmcote Limestone Member WARMS G15647, a partial skeleton[2]
Protoichthyosaurus P. prostaxalis[3] Somerset Unknown, probably Pre-planorbis beds Holotype: BRLSI M3553, "a partial skull, pectoral girdle and both forefins, preserved in ventral view"
Wahlisaurus W. massarae[4] Sutton Hill (Stowey) Quarry, Bishop Sutton Pre-planorbis beds BRSMG Cg240, "a practically complete rightcoracoid"
Plesiosaurs of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Atychodracon A. megacephalus[5] Street-on-the-Fosse Lowermost Blue Lias Holotype:BRSMG Cb 2335 Rhomaleosaurid
Avalonnectes A. arturi[6] Street, Somerset (referred specimen) NHMUK 14550, "the posterior portion of the skull, and a partial postcranial skeleton" uncatalogued partial specimen Rhomaleosaurid
Eurycleidus E. arcuatus Street BMNH 2030 (lectotype), 2027-2029, 2047, 2061, R1317-1319 (paralectotypes, probably belonging to the same individual) Rhomaleosaurid
Eoplesiosaurus E. antiquior[6] Watchet, Somerset TTNCM 8348, postcranial skeleton Basal Plesiosauroid
Stratesaurus S. taylori[6] Street, Somerset lowermost Hettangian OUMNH J.10337, "a skull and partial postcranial skeleton including anterior cervical and pectoral vertebrae, a partial hindlimb and ilium" Rhomaleosaurid
Thalassiodracon T. hawkinsii Street Pre-planorbis Beds BMNH 2018 "almost complete skeleton missing distal parts of limbs" CAMSM J.35181, partial skeleton Pliosaurid affinities[7]
  1. ^ a b Lomax, Dean R.; Massare, Judy A. (2017-02). Benson, Roger (ed.). "Two new species of Ichthyosaurus from the lowermost Jurassic (Hettangian) of Somerset, England". Papers in Palaeontology. 3 (1): 1–20. doi:10.1002/spp2.1065. {{cite journal}}: Check date values in: |date= (help)
  2. ^ Smith, A. S.; Radley, J. D. (2007-11). "A marine reptile fauna from the Early Jurassic Saltford Shale (Blue Lias Formation) of central England". Proceedings of the Yorkshire Geological Society. 56 (4): 253–260. doi:10.1144/pygs.56.4.253. ISSN 0044-0604. {{cite journal}}: Check date values in: |date= (help)
  3. ^ Lomax, Dean R.; Massare, Judy A.; Mistry, Rashmiben T. (2017-09-03). "The taxonomic utility of forefin morphology in Lower Jurassic ichthyosaurs: Protoichthyosaurus and Ichthyosaurus". Journal of Vertebrate Paleontology. 37 (5): e1361433. doi:10.1080/02724634.2017.1361433. ISSN 0272-4634.
  4. ^ Lomax, Dean R.; Evans, Mark; Carpenter, Simon (2019-01). Somerville, Id (ed.). "An ichthyosaur from the UK Triassic-Jurassic boundary: A second specimen of the leptonectid ichthyosaur Wahlisaurus massarae Lomax 2016". Geological Journal. 54 (1): 83–90. doi:10.1002/gj.3155. {{cite journal}}: Check date values in: |date= (help)
  5. ^ Smith, As (2015). "Reassessment of 'Plesiosaurus' megacephalus (Sauropterygia: Plesiosauria) from the Triassic-Jurassic boundary, UK". Palaeontologia Electronica. doi:10.26879/504. ISSN 1094-8074.
  6. ^ a b c Benson, Roger B. J.; Evans, Mark; Druckenmiller, Patrick S. (2012-03-16). Lalueza-Fox, Carles (ed.). "High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic Boundary". PLoS ONE. 7 (3): e31838. doi:10.1371/journal.pone.0031838. ISSN 1932-6203. PMC 3306369. PMID 22438869.{{cite journal}}: CS1 maint: PMC format (link) CS1 maint: unflagged free DOI (link)
  7. ^ Benson, Roger B. J.; Bates, Karl T.; Johnson, Mark R.; Withers, Philip J. (2011-05). "Cranial anatomy of Thalassiodracon hawkinsii (Reptilia, Plesiosauria) from the Early Jurassic of Somerset, United Kingdom". Journal of Vertebrate Paleontology. 31 (3): 562–574. doi:10.1080/02724634.2011.572937. ISSN 0272-4634. {{cite journal}}: Check date values in: |date= (help)