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Uta tumidarostra GRISMER, 1994

IUCN Red List - Uta tumidarostra - Vulnerable, VU

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Higher TaxaPhrynosomatidae, Sceloporinae, Iguania, Sauria, Squamata (lizards)
Common NamesE: Swollen-nosed Side-blotched Lizard
S: Mancha lateral Narigona 
SynonymUta tumidarostra GRISMER 1994: 461
Uta tumidarostra encantadae — UPTON & MURPHY 1997
Uta tumidarostra — GRISMER 1999
Uta tumidarostra — LINER 2007 
DistributionMexico (Islas Encantadas Archipelago, Gulf of California)

Type locality: Isla Coloradito, Baja California, Gulf of California, México.  
TypesHolotype: UA 49587; paratypes: SDSNH 
DiagnosisDiagnosis: Uta tumidarostra tentatively can be distinguished from all other species of Uta by having divided prefrontal scales. It is distinguished further from U. nolascensis, U. squamata, U. stansburiana, U. antiqua, U. stellata, and U. palmeri by having long and narrow, laterally directed postzygapophyseal processes of the atlas vertebra and a hypertrophied nasal salt gland with the accompanying morphological rearrangements of the rostrum(see above). It differs from U. lowei and U. encantadae by having smaller dorsal scales (measured as a significantly greater mean number of dorsals:Table1), squarish frontoparietals with broad medial contact, its larger body size, a more dense network of turquois dorsal body spots, and lacking an offset paravertebral pattern of dark blotches in adult males. It further differs from U. lowei in having the posterior mylohyoid foramen deep within the angular as opposed to being located between the angular and surangular, weakly, as opposed to strongly keeled dorsals, the presence of a parietal sulcus,orange or blue as opposed to yellow spots in the lateral gular region of adult males, and a dark gray to black as opposed to an off-white to light gray ventrum. It further differs from U. encantadae by having a much more dense networkof turquois spots on the dorsum in adult males (Grismer 1994).

Color in life. Adult males: groundcolor of dorsal surfaces of head, limbs, tail, and vertebral region dark gray; faint patternof darker, offset, paravertebral blotches not visible; ground color of lateral body region light gray to dull orange; dorsum of body overlain with dense network of turquois spots that grade into yellow-white spots laterally; large black axillary spot present; dorsal and lateral regions of tail nearly solid turquois. Gular and anterior portion of pectoral region very dark gray, lateral gular region with orange or blue spots; ventral surfaces of belly and limbs blue-gray to very dark gray; ventral surface of tail blue-gray.
Females and juveniles: ground color of dorsum gray to dark brown; pattern of asymmetrically arranged small, dark blotches, bordered posteriorly by light
markings on body, hind limbs, and tail. Ventrum like that of adult males (Grismer 1994).
CommentUpton, D. E. & R. W. Murphy. 1997. Mol. Phylog. Evol. 8(1):104-113. Sugieren que las tres especies de arriba sean tratadas como subespecies de Uta stansburiana. Este es rechazado por Grismer, L. L. 1999. Herpetologica 55(4):446-469. Aquí se sigue lo propuesto por Grismer, ya que Upton & Murphy no utilizaron tejidos de las especies descritas por Grismer en su análisis [cited from FLORES-VILLELA & CANSECO-MÁRQUEZ 2004].

Abundance: only known from the type locality (Meiri et al. 2017).

Diet: > 70% of this species’ diet appears to consist of isopoda (Grismer 1994). 
EtymologyThe name tumidarostra comes from the Latin tumidus meaning swollen or puffed up and the Latin rostrum meaning "that which gnaws" which, used in an altered state means "things resembling a snout".Tumidarostra refers to the swollen appearance of the rostrum of this species. 
  • Grismer L L 1994. Three new species of intertidal side-blotched lizards (genus Uta) from the Gulf of California, Mexico. Herpetologica 50 (4): 451-474 - get paper here
  • Grismer, L. Lee. 1999. An evolutionary classification of reptiles on islands in the Gulf of California, México. Herpetologica 55 (4): 446-469 - get paper here
  • Jones, L.L. & Lovich, R.E. 2009. Lizards of the American Southwest. A photographic field guide. Rio Nuevo Publishers, Tucson, AZ, 568 pp. [review in Reptilia 86: 84] - get paper here
  • Meiri, Shai; Aaron M. Bauer, Allen Allison, Fernando Castro-Herrera, Laurent Chirio, Guarino Colli, Indraneil Das, Tiffany M. Doan, Frank Glaw, Lee L. Grismer, Marinus Hoogmoed, Fred Kraus, Matthew LeBreton, Danny Meirte, Zoltán T. Nagy, Cristiano d 2017. Extinct, obscure or imaginary: the lizard species with the smallest ranges. Diversity and Distributions - get paper here
  • Upton, D. E.; Murphy, R. W. 1997. Phylogeny of the side-blotched lizards (Phrynosomatidae:Uta) based on mtDNA sequences: support for midpeninsular seaway in Baja California. Mol Phylogenet Evol 8 (1): 104-13 - get paper here
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