Ichthyosauridae

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Ichthyosauridae
Temporal range: latest Triassic-Early Cretaceous, 207–185 Ma
Ichthyosaurus breviceps 2.jpg
Fossil specimen of Ichthyosaurus breviceps
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Ichthyosauria
Node: Thunnosauria
Family: Ichthyosauridae
Bonaparte, 1841
Type species
Ichthyosaurus communis
Subgroups

Ichthyosauridae is an extinct family of thunnosaur ichthyosaurs from the latest Triassic and Early Jurassic (Rhaetian to Pliensbachian stages) of Europe, and possibly also from the middle Early Cretaceous (Hauterivian or Barremian stage) of Iraq. Named by Charles Lucien Bonaparte, in 1841, it is usually thought to contain a single genus, Ichthyosaurus, which is known from several species from the Early Jurassic. In 2013, Fischer et al. named and described Malawania anachronus from the middle Early Cretaceous of Iraq. It was found to share several synapomorphies with the type species of this family, Ichthyosaurus communis, and a large phylogenetic analysis recovered these species as sister taxa. Despite its geologically younger age, M. anachronus was also assigned to Ichthyosauridae.[1]

Phylogeny[edit]

Fischer et al. (2013) applied the name Ichthyosauridae Bonaparte, 1841 for the clade that contains Malawania anachronus and Ichthyosaurus communis. This clade was recovered in the phylogenetic analysis that was based on the largest currently available data matrix of parvipelvian species. Most other phylogenetic analyses, that were based on smaller matrices, also recovered this clade or found M. anachronus to be in a more basal position. Ichthyosauridae was recovered as the sister taxon of Baracromia, a clade first defined by Fischer et al. (2013) that includes all other thunnosaurs. The cladogram below follows the large phylogenetic analysis of Fischer et al. (2013).[1]

Life reconstruction of Ichthyosaurus anningae

Cladogram[edit]

Mikadocephalus gracilirostris

 Parvipelvia 

Hudsonelpidia brevirostris

Macgowania janiceps

 Neoichthyosauria 

Temnodontosaurus

Leptonectes tenuirostris

Eurhinosaurus longirostris

Excalibosaurus costini

Suevoleviathan disinteger

Hauffiopteryx typicus

Thunnosauria 
 Ichthyosauridae 

Ichthyosaurus communis

Malawania anachronus

 Baracromia 

Stenopterygius quadriscissus

Chacaicosaurus cayi

 Ophthalmosauridae 

Arthropterygius chrisorum

 Ophthalmosaurinae 

Mollesaurus periallus

Ophthalmosaurus icenicus (type species)

Baptanodon natans ("O." natans)

Acamptonectes densus

 Platypterygiinae 

Brachypterygius extremus

Maiaspondylus lindoei

Aegirosaurus leptospondylus

Sveltonectes insolitus

"Platypterygius" hercynicus

Caypullisaurus bonapartei

Athabascasaurus bitumineus

"Platypterygius" australis

References[edit]

  1. ^ a b Fischer, V.; Appleby, R. M.; Naish, D.; Liston, J.; Riding, J. B.; Brindley, S.; Godefroit, P. (2013). "A basal thunnosaurian from Iraq reveals disparate phylogenetic origins for Cretaceous ichthyosaurs". Biology Letters. 9 (4): 20130021. doi:10.1098/rsbl.2013.0021. PMC 3730615. PMID 23676653.