Reptiles that live in groups

Identification guide to amphibians and reptiles of mexico

This article analyzes in an interdisciplinary way the human-animal relationships of a group of artisanal fishermen in Argentina, whose trade leads them to incidentally capture threatened marine mammals and reptiles. We will address the interaction between this community and a group of biologists who seek the conservation of these species. Our hypothesis is that the human-animal relationships involved in the artisanal fishing practice of this community can be explained from a juxtaposition of the three paradigms defined by Pálsson (2001): the orientalist, the paternalist and the communalist. Although fishermen classify animal species according to their possibility of being exploited as a resource, they eventually negotiate with biologists for the protection of some of these species, reinventing themselves as strategic conservationists. The coexistence of the first two paradigms does not obscure the tacit communalism that permeates the fishermen's world of work and life.

Amphibians Ecuador

Reptiles inhabiting El Salvador include snakes, lizards, crocodiles and turtles. El Salvador has a herpetofauna that includes 141 species of reptiles,[1] which are grouped into 3 orders and 26 families.

The emydids (Emydidae) are a family of carnivorous aquatic and semi-aquatic turtles. They live most of the time in ponds, reservoirs and rivers, going to land when they have to find suitable places to lay their eggs. This family is made up of 10 genera containing more than 50 species, four of which occur in El Salvador.

Alligatoridae (Alligatoridae) is a family of crocodilian sauropsids (reptiles) native to the Americas (with the exception of one species), commonly known as alligators, caimans and caimans. It includes the extant genera Alligator, Caiman, Melanosuchus and Paleosuchus, as well as numerous extinct genera. Of the 7 species that inhabit the Americas, one occurs in El Salvador.

The Anguids (Aguidae), popularly known as glass lizards, are a family of lacertid reptiles characterized by atrophy of the legs, although they are not directly related to snakes; it is, therefore, a remarkable case of evolutionary convergence. The distribution of Anguidae covers the Old and New World. It is absent only from Australia. Most species are terrestrial and live in leaf litter on the forest floor. The Anguid family is divided into three subfamilies, eight genera and contains 94 species, of which 5 occur in El Salvador.

Guide to amphibians and reptiles of mexico pdf

Most reptiles are oviparous: iguanas, monitor lizards, geckos, turtles, some chameleons (others are ovoviviparous). Only some lizards and snakes such as the boa, rattlesnake and water snake are viviparous. Eggs are amniotic, can be deposited on land instead of in water, and keep the young protected from drying out by amniotic fluid. This allows them to develop and survive in dry environments, just as they would in the aquatic environment.

As in most animals, reptiles reproduce sexually and fertilization is always internal. Only some species of lizards and one family of snakes reproduce by parthenogenesis, whereby the mother does not need fertilization to breed.

The eggs of reptiles, as we have already mentioned, are amniotic, prepared to survive the dry climate. On the one hand, they consist of a hard and porous outer shell that protects the embryo from shocks, atmospheric conditions and predators; however, it is sufficiently permeable to allow the passage of oxygen and carbon dioxide from the outside. On the other side is the interior, with a sac containing amniotic fluid that moistens the embryo and another sac that collects waste. In addition, the egg contains a large amount of yolk that ensures the nutrition of the embryo.

Reptiles pdf

The chelidids (Chelydridae) are a family of freshwater turtles consisting of seven extinct genera and two extant genera, both native to the Americas. The extant genera are the snapping turtles (Chelydra) with three species, and the alligator snapping turtles (Macrochelys) with only one species. Of the total of four extant species, one occurs in Belize.

The emydids (Emydidae) are a family of carnivorous aquatic and semi-aquatic turtles. They live most of the time in ponds, reservoirs and rivers, going to land when they have to find suitable laying sites. This family is made up of 10 genera containing more than 50 species. Three of them occur in Belize.

The Anguids (Aguidae), popularly known as glass lizards, are a family of lacertid reptiles characterized by atrophy of the legs, although they are not directly related to snakes; it is, therefore, a remarkable case of evolutionary convergence. The distribution of Anguidae covers the Old and New World. It is absent only from Australia. Most species are terrestrial, living in leaf litter on the forest floor. The Anguid family is divided into three subfamilies, eight genera and contains 94 species, of which one occurs in Belize.