Toxicon. ;20(6) Envenomation by the Mexican lance-headed rattlesnake Crotalus polystictus: a case report. Hardy DL. A case of envenomation by. PDF | On Sep 30, , Rubén Alonso Carbajal Márquez and others published Crotalus polystictus. Diet. Genus: Crotalus. Species: polystictus. Common Names Mexican Lance-headed Rattlesnake, Mexican Lancehead Rattlesnake. Local Names Chiauhcoatl.

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File:Crotalus polystictus Mexikanische Lanzenkopf-Klapperschlange.jpg

Habits Mainly a diurnal and terrestrial snake with nocturnal tendencies in the hottest months. Snakes used for GM analysis of head morphology were collected during June and July as part of a long-term, mark-recapture study of C.

Close mobile search navigation Article navigation. However, we cannot rule out other potential causes of head dimorphism, such as sexual selection.

All GM protocols were performed in R, version 2. International Union for Conservation of Nature. Beware fluid crotalux causing shock, coagulopathy and bleeding, kidney damage and necrosis of the bitten area.

WCH Clinical Toxinology Resources

This page was last edited on 14 Mayat Views View Edit History. Seek urgent medical attention. It should not be assumed that humankind currently knows all there is to know about any species, even for polyystictus species.

Eyes are moderately small in size with vertically elliptical pupils. Loma Linda University Press, pp. Relationship between the centroid size a measure of head size of geometric configurations of head morphology and body length [snout—vent length — head length mm ] for male and female Crotalus polystictus.


Shallow phylogeographic structure in the declining Mexican Lance-headed Rattlesnake, Crotalus polystictus Serpentes: Cannibalism of nonviable offspring by postparturient Mexican lance-headed rattlesnakes, Crotalus polystictus.

Moreover, a narrow head may assist in extracting and swallowing dead, or nestling, prey from within highly confined spaces. OpenStreetMap – Google Earth. Interestingly, other than C. View large Download slide. Wikimedia Commons has media related to Crotalus polystictus. Such a foraging strategy would be unusual among rattlesnakes, which are typically surface ambush predators Klauber,and adopting this strategy could select for the unique dentition and head morphology of C.

Feeding ecology of the rattlesnake, Crotalus viridis oreganus, in northern Idaho.

Despite differences in body size, both males and females primarily consumed the same prey species: Do not use Tourniquets, cut, suck or scarify the wound or apply chemicals or electric shock. Integrated Taxonomic Information System.

Crotalus polystictus

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If no motor vehicle or boat is available, the patient can be carried on a stretcher or hurdle, on the pillion or crossbar of a bicycle or on someone’s back.

For example, combat between males for access to mates could select for head size if larger heads are advantageous in combat. The herpetofauna of Jalisco, Mexico: An emerging generality is that the direction and ctotalus of sexual size dimorphism SSD is at least partly determined by the strength of and interactions between forces acting on sexual selection.

Bulletins of the Zoological Society of San Diego Although larger mammals comprised a small proportion of the total diet of males numerically, the consumption of rabbits, rats, and squirrels contributes significantly to the annual energy budget of male rattlesnakes, which attain greater body lengths, and much greater masses, than do females.


The bitten limb must not be exercised as muscular contraction will promote systemic absorption of venom. Reptarium The Reptile Database.

ploystictus Relationship between scores from the first principal component axis of head shape variation and centroid size a measure of head size in Crotalus polystictusillustrating sexual dimorphism in head shape and positive allometry of head shape in males. Taxonomic studies on rattlesnakes of Mainland Mexico. Small Approx 20k version. The herpetofauna of Puebla, Mexico: Adobe Photoshop CS2 Windows.

Crotalus polystictus – Wikipedia

BMC Evolutionary Biology9: We rejected the null hypothesis of no difference in y -intercepts type Polyatictus sums of squares: This explanation is consistent with our data, and may be particularly relevant if males switch to larger prey at relatively small body sizes.

Phylogeny of the rattlesnakes Crotalus and Sistrurus inferred from sequences of five mitochondrial genes. For this analysis, we treated sex as cgotalus categorical predictor variable, and divided prey species into six categories as levels of the response variable.