Ichthyosaurus is a Lower Jurassic ichthyosaur genus whose Hettangian Somerset material supports diagnosable species and explicit phylogenetic tests.
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References / paperTwo new species of Ichthyosaurus from the lowermost Jurassic (Hettangian) of Somerset, England
Lomax, D.R.; Massare, J.A.
Year2017
Source roleprimary-study
DOI / ID10.1002/spp2.1065
Fitness and scope
taxonomy · topology · range · morphology · biogeography
Hettangian Somerset specimens support species diagnoses and phylogenetic testing within Ichthyosaurus; the interval is regional and not a genus-wide global range.
Claim ledger
The 200–190 Ma genus envelope remains a legacy global composite, while the claim-linked Somerset record is restricted to the Hettangian interval of 201.4–199.5 Ma.
claim:taxon:ichthyosaurus:fossil-rangeThe profile-highlighted Ichthyosaurus specimens are from Hettangian strata of Somerset, England; this regional sample is not a global distribution map.
claim:taxon:ichthyosaurus:biogeographyThe Somerset Ichthyosaurus species are diagnosed from cranial and postcranial character combinations evaluated in a phylogenetic matrix.
claim:taxon:ichthyosaurus:morphologyOne Ichthyosaurus communis specimen preserves probable fish gullet contents, and comparative vertebral anatomy including I. communis supports caudal-fluke propulsion; neither sample establishes one genus-wide diet, habitat or performance envelope.
claim:taxon:ichthyosaurus:ecology