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Sceloporus gadsdeni CASTAÑEDA-GAYTÁN & DÍAZ-CÁRDENAS, 2017

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Higher TaxaPhrynosomatidae, Sceloporinae, Iguania, Sauria, Squamata (lizards)
Common NamesE: Lagoon Spiny Lizard 
SynonymSceloporus gadsdeni CASTAÑEDA-GAYTÁN & DÍAZ-CÁRDENAS in DÍAZ-CÁRDENAS et al. 2017 
DistributionMexico (Coahuila)

Type locality: 25°39 ́12’’ N, 103°10 ́21’’ W at the Sierra de San Lorenzo, Coahuila. Ca. 1169 m elevation.  
Reproductionviviparous (ovoviviparous) 
TypesHolotype: CHFCB 0163 (Colección Herpetológica Facultad de Ciencias Biológicas), adult male, collected on May 2nd 2016, by Gamaliel Castañeda-Gaytán (Figs. 5A,B; 6A-C in DÍAZ-CÁRDENAS et al. 2017). Paratypes: One male (CHFCB 0165: N 25°39 ́12’’ W 103°10 ́21’’) and 2 females (CHFCB 0164: N 25°39 ́12’’ W 103°10 ́21’’; CHFCB 0166: N 25°39 ́08’’ W 103°10 ́28’’) from the Sierra San Lorenzo (see details in Table 2), Coahuila, Mexico. 
DiagnosisDiagnosis: This species differs from S. cyanostictus in the dorsal color pattern (live), which is completely green with two dominant tonalities (metallic green and turquoise). The ventral pattern has a blue patch that joins in the middle of the belly and the chest with black borders in males; in contrast, in S. cyanostictus the chest and undersurfaces of arms are pale grayish blue with melanin specks, each flank has a poorly defined bluish black belly patch sometimes without contact in the middle of the belly. According to currently available published information, S. cyanostictus from eastern Coahuila has 6 superciliars and 6 infralabials (Axtell and Axtell, 1971), while S. gadsdeni has 4 superciliar scales on each side of the head and 5 infralabials with uncertainty on this character due to sample size (Table 2).
CommentDistribution: The distribution of S. gadsdeni is restricted to the Sierras Texas, Solis and San Lorenzo mountain ranges in southwestern Coahuila. These mountains are separated from the location of S. cyanostictus by ca. 190 km as the crow flies and immersed within the low Mayran Basin.

Habitat: rock walls, boulders and canyons. 
EtymologyThis species is named in honor of Hector Gadsden, a researcher who has made praiseworthy contributions to the ecology and conservation of the herpetofauna of La Comarca Lagunera and the Chihuahuan Desert. The suggested common name alludes to its restricted distribution within the La Comarca Lagunera region. 
  • Díaz-Cárdenas, Brenda; Ruiz-Sanchez, Eduardo; Castro-Felix, Patricia; Castañeda-Gaytán, Gamaliel; Ruiz-Santana, Sergio; Gadsden, Héctor 2017. Species delimitation of the blue-spotted spiny lizard within a multilocus, multispecies coalescent framework, results in the recognition of a new Sceloporus species. Molecular Phylogenetics and Evolution - get paper here
  • Díaz‐Cárdenas B; Ruiz‐Sanchez E; Gadsden H; García‐Enriquez J.M.; Castro‐Felix P.; Castañeda‐Gaytán G & Santerre A. 2019. Physiographic and climatic events in the Chihuahuan Desert lead to the speciation and distinct demographic patterns of two sister Sceloporus lizards. J Zool Syst Evol Res. 2019; 00: 1– 13 - get paper here
  • Gadsden, Héctor; Gamaliel Castañeda, Rodolfo A. Huitrón-Ramírez, Sergio A. Zapata-Aguilera, Sergio Ruíz, Geoffrey R. Smith 2018. Ecology of Sceloporus gadsdeni (Squamata: Phrynosomatidae) from the central Chihuahuan Desert, Mexico. Phyllomedusa 17 (2): 181-193 - get paper here
  • Lazcano D, Nevárez-de los Reyes M, García-Padilla E, Johnson JD, Mata-Silva V, DeSantis DL, Wilson LD. 2019. The herpetofauna of Coahuila, Mexico: composition, distribution, and conservation status. Amphibian & Reptile Conservation 13(2) [General Section]: 31–94 (e189) - get paper here
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