Natural History and Morphology of Crotalus ehecatl (Serpentes: Viperidae)

Periodo de realización: 1900/01/01 al 2022/01/01

Tipo: Artículo científico

Resumen: "The Tehuantepec Isthmus rattlesnake (Crotalus ehecatl) is a poorly known species endemicto Mexico. We describe its diet, morphological variation, life history traits and activity patterns basedon data from field encounters, museum specimens, and published data. Its diet consists almostexclusively of mammals, with no detected ontogenetic shift or sexual differences in prey type, andwith feeding happening mainly in the rainy season. As the first detailed study on the feeding ecologyof C. ehecatl, it adds six new prey species and suggests a homogeneous diet among age classes andsexes, but not among seasons. Crotalus ehecatl does not present sexual dimorphism in snout-ventlength, head length or total length, but males have significantly longer tails than females, possessfewer ventral scales, more subcaudal and anterior intersupraocular scales. Crotalus ehecatl showed aunimodal activity pattern with peak activity in the summer, with crepuscular and nocturnal activityduring the warmer months, and diurnal activity during the cooler months. The timing of C. ehecatlreproductive events, is similar to other rattlesnakes from temperate and tropical zones. Additionalstudies on this and related species would help to understand how the ecology of Neotropicalrattlesnakes differs from rattlesnakes of more temperate zones."

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