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Ichthyosaurus tenuirostris

Reptilia -

Taxonomy
Ichthyosaurus tenuirostris was named by Conybeare (1822). It is a 3D body fossil.

It was recombined as Leptopterygius tenuirostris by Huene (1922), Delair (1960), Appleby (1979) and McGowan (1989); it was recombined as Leptonectes tenuirostris by Maisch and Matzke (2000), Maisch and Matzke (2003), Maisch (2010) and Fischer et al. (2013).

Synonyms
Synonymy list
YearName and author
1822Ichthyosaurus tenuirostris Conybeare pp. pl. 15, fig. 10
1830Ichthyosaurus grandipes Sharpe p. 222
1834Ichthyosaurus chirostrongulostinus Hawkins p. 12 figs. Pl. XVI
1840Ichthyosaurus tenuirostris Owen p. 117
1851Ichthyosaurus tenuirostris Mantell p. 362
1854Ichthyosaurus sinuatus Theodori p. 50
1858Ichthyosaurus tenuirostris Buckland p. 168
1861Ichthyosaurus tenuirostris Owen p. 223
1889Ichthyosaurus tenuirostris Lydekker p. 83 figs. 25, 26
1922Leptopterygius tenuirostris Huene
1934Ichthyosaurus tenuirostris Swinton fig. VIII
1960Leptopterygius tenuirostris Delair p. 70
1979Leptopterygius tenuirostris Appleby p. 943
1989Leptopterygius tenuirostris McGowan p. 413
2000Leptonectes tenuirostris Maisch and Matzke p. 72
2003Leptonectes tenuirostris Maisch and Matzke pp. 116-124 figs. 1-4
2010Leptonectes tenuirostris Maisch
2013Leptonectes tenuirostris Fischer et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
RankNameAuthor
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Ichthyosauromorpha
Ichthyosauriformes
Ichthyopterygia(Owen 1840)
Eoichthyosauria
Ichthyosauria(de Blainville 1835)
genusIchthyosaurusKoenig 1818
speciestenuirostris

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
W. D. Conybeare 1822In this the teeth are much more slender than in the preceding species. But the species is best marked by the extreme length and thinness of the snout, in which points it very strikingly exceeds all the other ichthyosauri
R. M. Appleby 1979"As set out by McGowan (1974, p. 25) with the additional facts that the number of primary fingers may be three or four and that the coracoid shows all gradations in the species from longipinnatoid to latipinnatoid."
M. W. Maisch and A. T. Matzke 2000"Small species never exceeding 4 m in length, snout very long."
M. W. Maisch and A. T. Matzke 2003Medium-sized ichthyosaur, total length around 4,000 mm at maximum; skull length not exceeding 1,000 mm; snout very long and slender, orbital ratio of skull less than 0.25; snout ratio exceeding 0.70; prenarial ratio larger than 0.56; sclerotic ratio much larger than 0.34; snout without or with only rather inconspicuous overbite; fenestra supratemporalis of rounded shape, about one third the size of orbita; jugal with narrow, dorsoventrally depressed ramus suborbitalis and considerably wider ramus postorbitalis; forefin relatively wide with four well-developed primary digits; humerus with strongly constricted shaft and well-developed leading edge facet; foramen interosseum remaining usually open between radius and ulna; radius and tibia notched; other fin elements usually unnotched; phalanges discoidal, large, rather widely spaced distally; femur with slender shaft, expanded distally.