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Alectrosaurus olseni

Reptilia

Taxonomy
Alectrosaurus olseni was named by Gilmore (1933). Its type specimen is AMNH 6554, a set of postcrania (manual unguals, partial pelvis, and hindlimbs), and it is a 3D body fossil. 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 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
1935Alectrosaurus olseni Young
1939Alectrosaurus olseni Kuhn p. 81
1967Alectrosaurus olseni Charig p. 714
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
2012Alectrosaurus olseni Averianov and Sues p. 284
2015Alectrosaurus olseni Tsuihiji et al. p. 64
2016Alectrosaurus olseni Currie p. 84
2018Alectrosaurus olseni Dalman et al. p. 132
2023Alectrosaurus olseni Carr p. 6

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Theropoda()
—Neotheropoda
—AverostraPaul 2002
—Tetanurae
—Coelurosauria()
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.

†Alectrosaurus olseni Gilmore 1933
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Diagnosis
ReferenceDiagnosis
C. W. Gilmore 1933GENERIC AND SPECIFIC CHARACTERS.—Long 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.
T. D. Carr 2023In addition to the diagnostic characters identified by Mader and Bradley (1989) added here include: spike-like process extends from the caudodorsal surface of the medial condyle of the femur; oval scar on the caudal surface of the femur is lateral to the midline; abrupt expansion in length of the cranial margin of the fibula at the distal joint surface for the tibia; tendon pit adjacent to the ventrolateral buttress of the astragalus undercuts the medial surface of the buttress; expanded and, in several cases, pediculate distal joint surfaces
on the metatarsals and phalanges; lateral flange of MTT I is tri- angular; center of the flexor groove of II-2 is convex; lateral ridge that bounds the flexor groove of III-2 is a prominent keel; rugosities absent above the collateral ligament pits of III-3; in dorsal view, wide caudal region of the shaft of III-3 is limited to the caudal third of the shaft; scar caudodorsal to the medial collateral ligament pit is low in III-3; dorsal ridge of III-4 extends medial the midline of the bone; longitudinal groove excavates the distal third of the ventral surface of IV-5.