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Falcarius utahensis
Taxonomy
Falcarius utahensis was named by Kirkland et al. (2005). Its type specimen is UMNH VP 15000 and is a 3D body fossil. Its type locality is Crystal Geyser Quarry (UMNH VP Loc. 157), which is in a Berriasian/Valanginian spring mudstone/limestone in the Cedar Mountain Formation of Utah.
Synonymy list
Year | Name and author |
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2005 | Falcarius utahensis Kirkland et al. p. 84 |
2006 | Falcarius utahensis Zanno p. 637 |
2007 | Falcarius utahensis Li et al. p. 545 |
2007 | Falcarius utahensis Naish and Martill p. 504 |
2007 | Falcarius utahensis Suarez et al. p. 500 |
2009 | Falcarius utahensis Zanno et al. p. S15 |
2010 | Falcarius utahensis Zanno pp. 197-198 |
2012 | Falcarius utahensis Qian et al. p. 342 |
2012 | Falcarius utahensis Senter et al. p. 1 |
2013 | Falcarius utahensis Brusatte et al. p. 5 fig. 1.2 |
2013 | Falcarius utahensis Pu et al. |
2013 | Falcarius utahensis Zanno et al. p. 512 |
2014 | Falcarius utahensis Delcourt and Grillo p. 312 |
2015 | Falcarius utahensis Milàn et al. p. 522 |
2016 | Falcarius utahensis Kirkland et al. p. 24 |
2019 | Falcarius utahensis You et al. p. 8 |
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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.
†Falcarius utahensis Kirkland et al. 2005
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Diagnosis
Reference | Diagnosis | |
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L. E. Zanno 2010 | Falcarius utahensis is a primi- tive therizinosaur, currently best known from sub- adult individuals, the largest of which is estimated at approximately 4–5 m in length. Falcarius utahensis can be differentiated from all other therizinosaurs by the absence of a lateral shelf on the dentary and possession of elongate distal caudal centra with length to width ratio greater than 4 : 1, and by the combination of the following autapomorphic features: antorbital fenestra extends onto lateral margin of nasal; facet for postorbital on frontal rostral to pos- torbital process; expansive, deeply depressed, and highly pneumatic subcondylar and subotic recesses each possessing multiple pneumatic fossae; inflated basisphenoid with hypertrophied basispenoidal recess; rostral dentary teeth conical and extending to, at minimum, the fifth dentary tooth position; cupped, dorsoventrally elongate rostral teeth lacking den- ticles; median ridge dividing ventral sulcus of cervical vertebrae; infraprezygapophyseal fossa on cranial dorsal vertebrae divided into three accessory fossae; accessory caudal centrodiapophyseal lamina on cranial dorsal vertebra; hypertrophied, obliquely ori- entated entepicondyle, with concave caudal margin, and well-defined groove extending proximally up humeral shaft; flexor tubercle on PI-II with deep, distally positioned collateral ligament pits; proximal pubic tubercle (sensu Hutchinson, 2001), well devel- oped and caudolaterally orientated, occurring at cra- nialmost margin of acetabulum; mid-series chevrons possessing markedly distinct cranial tubercles. | |
L. E. Zanno 2010 | A therizinosaurian bearing the following autapomorphies: antorbital fenestra extends onto lateral margin of nasal; facet for postorbital on frontal rostral to postorbital process; expansive, deeply depressed, and highly pneumatic subcondylar and subotic recesses each possessing multiple pneumatic fossae; inflated basisphenoid with hypertrophied basisphenoidal recess; rostral dentary teeth conical, extending to, at minimum, the fifth dentary tooth position; cupped, dorsoventrally elongate rostral teeth lack- ing denticles; median ridge dividing ventral sulcus of cervical vertebrae; infraprezygapophyseal fossa on cranial dorsal vertebrae divided into three accessory fossae; accessory caudal centrodiapophyseal lamina on cranial dorsal vertebra; hypertrophied, obliquely oriented humeral entepicondyle, with concave caudal margin, and well-defined groove extending proximally up humeral shaft; flexor tubercle on manual PI-II with deep, distally positioned collateral ligament pits; proximal pubic tubercle (sensu Hutchinson 2001) well developed and caudolaterally oriented, occurring at cranialmost margin of acetabulum; midseries chevrons possessing markedly distinct cranial tubercles (Zanno 2010). |
Measurements
No measurements are available
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Source: subo = suborder, o = order | |||||
References: Benton 1983, Marsh 1875 |
Age range: base of the Berriasian to the top of the Valanginian or 145.00000 to 132.90000 Ma
Collections: one only
Time interval | Ma | Country or state | Original ID and collection number |
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Berriasian - Valanginian | USA (Utah) | Therizinosauroidea indet. (type locality: 50052) |