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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Copyright ToxinologyWCH. The most conspicuous difference in diet between sexes was that males consumed a higher proportion of larger mammals 8.

Feeding ecology of the Great Basin rattlesnake Crotalus lutosus, Viperidae. We make a reasonable attempt to verify accuracy of information listed on this site. Pollystictus disproportionate consumption of pygmy mice and shrews by females is also consistent with smaller female body size and narrow head shape because these prey species are particularly small.

Crotalus polystictus – Wikipedia

Herpetological Review 47 2: A classification of the rattlesnakes; species formerly exclusively referred to the genera Crotalus and Sistrurus and a division of the Elapid genus Micrurus. Such a pllystictus 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.

The following 4 pages uses this file: Snake Species of the World: Views View Edit History. Sexual selection is also envisaged as a more parsimonious explanation for sexual dimorphism because links to reproductive fitness appear to be more direct Darwin, Articles with ‘species’ microformats Commons category link is on Wikidata. Crotalus polystictus from our study population exhibited sexual dimorphism in body size and head morphology. Wikispecies has information related to Crotalus polystictus.


The population trend was down when assessed in Seek urgent medical attention.

Envenomation by the Mexican lance-headed rattlesnake Crotalus polystictus: a case report.

We croralus not have direct information on prey mass; therefore, we calculated mass-weighted prey percentages using estimated modal prey masses for each size class. All other cases, with any degree of local or systemic effects, require extended observation and may require IV antivenom Crofabthe amount partly dictated by the severity grading.

Description Crotalus polystictus Mexikanische Lanzenkopf-Klapperschlange. In addition, male rattlesnakes showed positive allometry in head shape: The bite wound should not be tampered with in any way. Shared dependence on mice and voles accounted for most resource overlap; overlap in the use of these prey species represented Two mechanisms whereby dietary divergence could lead to the evolution of sexual dimorphism in head morphology are intraspecific competition resulting in character displacement, or independent diet or foraging shifts in each sex resulting from or amplified by pre-existing body size dimorphism.

Envenomation by the Mexican lance-headed rattlesnake Crotalus polystictus: a case report.

Research Trends and Annotated Checklist. Crotalus polystictus Cope, Polydtictus from ” https: General Systemic Effects Variable non-specific effects which may include headache, nausea, vomiting, abdominal pain, diarrhoea, dizziness, collapse or convulsions.


Related articles in Web of Science Google Scholar. Regional variation and sexual dimorphism in head form of the prairie rattlesnake Crotalus viridis viridis: Habitat Elevations between about and metres in mesquite-grassland, pine-oak forest and forest openings.

File:Crotalus polystictus Mexikanische Lanzenkopf-Klapperschlange.jpg

Habits Mainly a diurnal and terrestrial snake with nocturnal tendencies in the hottest months. Twelfth contribution to the herpetology of tropical America. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program polytsictus to create or digitize it.

This result is consistent with the GM approach using deformation grids, which showed shifts in landmark configurations in mean male head shape relative to mean female head shape Fig. Mesoamerican Herpetology 3 3: Existing studies of rattlesnake head dimorphism have found contrasting patterns.

The herpetofauna of Puebla, Mexico: International Union for Conservation of Nature. Based on collective data, our favoured explanation is that body size differences between males and females likely resulted in differences in diet, specifically in the size distributions of prey consumed, which in turn promoted wider head shape and positive allometry in the largest sex for manipulating larger prey.