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Alectrosaurus olseni
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).
It was recombined as Albertosaurus olseni by Paul (1988).
Synonymy list
Year | Name and author |
---|---|
1933 | Alectrosaurus olseni Gilmore p. 35 figs. 8-10 |
1935 | Alectrosaurus olseni Young |
1939 | Alectrosaurus olseni Kuhn p. 81 |
1967 | Alectrosaurus olseni Charig p. 714 |
1970 | Alectrosaurus olseni Steel p. 40 |
1977 | Alectrosaurus olseni Perle p. 104–105 |
1977 | Alectrosaurus olseni Rozhdestvensky p. 112 |
1979 | Alectrosaurus olseni Baird and Horner p. 9 |
1986 | Alectrosaurus olseni Gauthier p. 9 |
1986 | Alectrosaurus olsoni Yu and Qi p. 164 |
1988 | Albertosaurus olseni Paul p. 328 |
1989 | Alectrosaurus olseni Mader and Bradley p. 43 |
1990 | Alectrosaurus olseni Molnar et al. p. 190 |
1992 | Alectrosaurus olseni Currie p. 246 |
1992 | Alectrosaurus olseni Dong p. 165 |
1993 | Alectrosaurus olseni Currie and Eberth p. 138 |
1994 | Alectrosaurus olseni Russell and Dong pp. 2108-2109 |
1995 | Alectrosaurus olseni Nessov p. 39 |
1996 | Alectrosaurus olseni Novas p. 676 |
1997 | Alectrosaurus olseni Barsbold p. 448 |
1999 | Alectrosaurus olseni Manabe p. 1176 |
2000 | Alectrosaurus olseni Currie p. 447 |
2001 | Alectrosaurus olseni Holtz, Jr. p. 68 fig. 7.2 |
2003 | Alectrosaurus olseni Currie et al. p. 231 |
2003 | Alectrosaurus olseni Rauhut p. 43 |
2004 | Alectrosaurus olseni Holtz, Jr. p. 113 |
2009 | Alectrosaurus olseni Turner et al. p. 11 |
2011 | Alectrosaurus olseni Hone et al. p. 501 |
2012 | Alectrosaurus olseni Averianov and Sues p. 284 |
2015 | Alectrosaurus olseni Tsuihiji et al. p. 64 |
2016 | Alectrosaurus olseni Currie p. 84 |
2018 | Alectrosaurus olseni Dalman et al. p. 132 |
2023 | Alectrosaurus olseni Carr p. 6 |
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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
Reference | Diagnosis | |
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C. W. Gilmore 1933 | GENERIC 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 1989 | Small 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 2023 | In 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. |
Measurements
part | N | mean | |||||
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femur circumference | 1 | 215.0 | |||||
tibia circumference | 1 | 201.0 |
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Source: g = genus, subo = suborder, o = order | |||||
References: Marsh 1875, Benton 1983, Peczkis 1995 |
Age range: base of the Middle Campanian to the top of the Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (2 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Middle Campanian - Late/Upper Campanian | China (Nei Mongol) | Alectrosaurus olseni (type locality: 49356 49369) |