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Uromastyx geyri MÜLLER, 1922

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Higher TaxaAgamidae (Uromastycinae), Sauria, Iguania, Squamata (lizards)
Common NamesE: Geyr’s Spiny-tailed Lizard, Sahara Mastigure
G: Geyrs Dornschwanzagame 
SynonymUromastyx temporalis VALENCIENNES 1854 (?)
Uromastix geyri MÜLLER 1922: 193
Uromastyx acanthinurus geyri — MERTENS 1962: 430
Uromastyx acanthinurus geyri — WERMUTH 1967: 101
Uromastyx (acanthinura) geyri — SCHLEICH, KÄSTLE & KABISCH 1996: 310
Uromastyx geyri — WILMS & BÖHME 2001
Uromastyx geyri — WILMS et al. 2009
Uromastyx geyri — TAMAR et al. 2017 
DistributionSouth Algeria, Mali and Niger (Air and Hoggar Mountain area).

Type locality: entre Aquebly et Djebbel-Hoggar, Sahara. Lectotype: Gara Djenoum, Ahaggar Mts. Algeria, S Algeria.  
TypesNeotype: ZFMK 9230 (designated by MÜLLER 1951); Paratypes: ZFMK 9226, female, upper Tahihaout, 28 April 1914; ZFMK 9227, male, Oued Ouhat, 8 April 1914; ZFMK 9228, juvenile, In Kelmet, 6 February 1914; all localities in the Ahaggar Mountains, South Algeria, from the same collector; ZSM. 
DiagnosisDifferential diagnosis: U. geyri is distinguished from U. thomasi and U. princepsby the longer and narrower tail (65.45–98.06 % of SVLin U. geyri vs. 25.00–36.16 % in U. thomasiand 34.62–52.55 % in U. princeps); from the species of the U. ocellata group and U. macfadyeniby the arrangement of the annuli of the tail: last 8–21 forming a continuous scale row each (U. ocellatagroup and U. macfadyeni) vs. 2–5 whorls forming a continuous scale row in U. geyri; from U. aegyptiaand U. occidentalisby the lower scale counts around midbody (238–322 in U. aegyptia, 297–301in U. occidentalis vs. 142–196 in U. geyri), from U. acanthinura, U. nigriventrisand U. dispar by its longer tail (65.45–98.06 % of SVLin U. geyri vs. 50.27–74.42 in U. acanthinura, 47.83–70 % in U. disparand 43.48–75.14 % in U. nigriventris). From U. alfredschmidtiit is distinguished by differences in the scalation of the flanks (enlarged triangular and imbricate scales in U. alfredschmidti vs. enlarged tubercular scales in U. geyri), as well as the complete black colouration of adult males in U. alfredschmidti. 
CommentStatus of Uromastyx temporalis unclear. 
Etymologynamed after ornithologist H. Geyr von Schweppenburg who brought the first specimens of this species to Europe. 
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