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Alectrosaurus olseni

Reptilia - Avetheropoda

Taxonomy
Alectrosaurus olseni was named by Gilmore (1933). It is not extant. Its type specimen is AMNH 6368. Its type locality is AMNH quarry 136, Iren Dabasu, which is in a Campanian/Campanian fluvial-lacustrine horizon in the Iren Dabasu Formation of China. It is the type species of Alectrosaurus. It was considered monophyletic by Currie (2000).

It was recombined as Albertosaurus olseni by Paul (1988).

Synonymy list
YearName and author
1933Alectrosaurus olseni Gilmore p. 35 figs. 8-10
1935Alectrosaurus olseni Young
1970Alectrosaurus olseni Steel p. 40
1977Alectrosaurus olseni Perle p. 104–105
1977Alectrosaurus olseni Rozhdestvensky p. 112
1979Alectrosaurus olseni Baird and Horner p. 9
1986Alectrosaurus olseni Gauthier p. 9
1986Alectrosaurus olsoni Yu and Qi p. 164
1988Albertosaurus olseni Paul p. 328
1989Alectrosaurus olseni Mader and Bradley p. 43
1990Alectrosaurus olseni Molnar et al. p. 190
1992Alectrosaurus olseni Currie p. 246
1992Alectrosaurus olseni Dong p. 165
1993Alectrosaurus olseni Currie and Eberth p. 138
1994Alectrosaurus olseni Russell and Dong pp. 2108-2109
1995Alectrosaurus olseni Nessov p. 39
1996Alectrosaurus olseni Novas p. 676
1997Alectrosaurus olseni Barsbold p. 448
1999Alectrosaurus olseni Manabe p. 1176
2000Alectrosaurus olseni Currie p. 447
2001Alectrosaurus olseni Holtz, Jr. p. 68 fig. 7.2
2003Alectrosaurus olseni Currie et al. p. 231
2003Alectrosaurus olseni Rauhut p. 43
2004Alectrosaurus olseni Holtz, Jr. p. 113
2009Alectrosaurus olseni Turner et al. p. 11
2011Alectrosaurus olseni Hone et al. p. 501
2015Alectrosaurus olseni Tsuihiji et al. p. 64

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
RankNameAuthor
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
suborderCoelurosauria
superfamilyTyrannosauroidea
genusAlectrosaurus
speciesolseni

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
C. W. Gilmore 1933Long slender-limbed type of deinodont; humerus long and slender; ungual and phalanx of digit I robust, laterally compressed and strongly curved; femur and tibia subequal in length; length of astragalus one-fourth the combined length of astragalus and tibia.
B. J. Mader and R. L. Bradley 1989Small to medium sized tyrannosaur; pedal digit III relatively shorter compared to length of metatarsal III than in most other tyrannosaurs. Distinct lip demarcates posterior border of distal condyle of metatarsal III so that distal articulatory surface is not medially continuous with the shaft as it is in Albertosaurus, Tyrannosaurus, and Struthiomimus. Flexor tubercles on pedal digits III and IV (and probably II, which is incompletely preserved in AMNH 6554) relatively larger than those of Albertosaurus (and probably Tarbosaurus) and extending posteriorly so that they are almost flush with the ventral margin of the articular facet.