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Shastasaurus pacificus

Reptilia - Shastasauridae

Taxonomy
Shastasaurus pacificus was named by Merriam (1895). It is a 3D body fossil. Its type locality is Shasta County area, which is in a Carnian marine limestone in California.

Synonyms
Synonymy list
YearName and author
1895Shastasaurus pacificus Merriam
1902Shastasaurus osmonti Merriam p. 93 figs. Plates 8 - 11
1902Shastasaurus careyi Merriam p. 98 figs. Plate 1C, FIgures 3 and 4
1902Shastasaurus altispinus Merriam p. 99 figs. Pl. 14, fig. 5, and Pl. 15.
1902Shastasaurus pacificus Merriam p. 102 figs. Pl. 14, pigs. 1 and 2
1908Shastasaurus osmonti Merriam p. 138
1908Shastasaurus pacificus Merriam p. 143
1908Shastasaurus altispinus Merriam p. 144
1908Shastasaurus careyi Merriam p. 145
1985Shastasaurus osmonti Orr and Katsura
1989Shastasaurus altispinus Callaway and Massare pp. 933-934 figs. 3-7
1994Shastasaurus pacificus Mcgowan p. 169
2000Shastasaurus pacificus Maisch and Matzke p. 68
2010Shastasaurus pacificus Maisch

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Ichthyosauromorpha
Ichthyosauriformes
Ichthyopterygia(Owen 1840)
Eoichthyosauria
Ichthyosauria(de Blainville 1835)
Hueneosauria
Merriamosauria
familyShastasauridaeMerriam 1902
genusShastasaurus
speciespacificus

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
J. M. Callaway and J. A. Massare 1989 (Shastasaurus altispinus)"Diapophysial ridges of the dorsal vertebrae slender and greatly constricted at the point where the lower part of the ridge swings anteriorly; dorsal centra with average length/height ratio of 0.47; neural spines of dorsal vertebrae very thick transversely with almost circular cross sections except for blade-like anterior and posterior margins, relative height greater than in the other species, distal end hollowed by groovelike anteroposterior excavation; middle and posterior dorsal ribs broadheaded with rib-heads having two articular surfaces, the upper surface sharply turned away from the plane of the lower, the upper surface distinctly concave and more noticeably pitted than the lower; dorsal rib shafts almost triangulari n cross section proximally with slightly convex upper surface and grooved anteriorly and posteriorly, medial portion of shafts generally flattened; paddle elements ellipsoidal, leading edge of anterior elements sharply and deeply notched, central elements without notching or emargination, external edge of posterior elements emarginated, all elements with concave and roughened peripheral faces; teeth robust with slight lateral compression and with two sharp carinae on each tooth aligned parallel to the jaws."
M. W. Maisch and A. T. Matzke 2000"Pubis with almost closed obturator notch in posterior margin, proximal margin of pubis as wide as distal margin, posterior thoracal vertebral centra more than half as long as they are high."
Measurements
No measurements are available
Composition: hydroxyapatiteo
Environment: marineo
Locomotion: actively mobileo
Life habit: nektonico
Diet: carnivoreo
Reproduction: viviparouso
Created: 2009-07-20 06:07:40
Modified: 2010-02-23 00:20:57
Source: o = order
Reference: Kiessling 2004

Age range: base of the Carnian to the top of the Norian or 237.00000 to 208.50000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Triassic252.17 - 201.3USA (California) Shastasaurus osmonti (153314)
Carnian237.0 - 228.0USA (California) Shastasaurus altispinus (190855) Shastasaurus pacificus (type locality: 196798)
Carnian237.0 - 228.0Mexico (Sonora) Shastasaurus altispinus (102472)
Carnian - Norian237.0 - 208.5USA (California) Shastasaurus careyi (196803)
Norian228.0 - 208.5USA (Oregon) Shastasaurus osmonti (140303)