Análise do desenvolvimento e rendimento de ootecas de Phoneutria nigriventer (keyserlingi,1981) no Biotério de Artrópodes do Instituto Butantan-SP

Abstract

The species Phoneutria nigriventer belongs to the class Arachnida and order aranae, it is described as a synanthropic animal, with characteristics of aggressiveness, high stress, wanderers and opportunists. In addition, it has a medical interest in public health, having a potential poison to cause injuries, not only in predatory prey, but also in humans. The developmental stages of the species are, in sequence: ootheca, egg, pre-larval, larval, young, juvenile, pre-adult and adult. In the present study, the phases of ootheca and, mainly, hatchlings were analyzed, through a creation in captivity with constant control of physical parameters (temperature and humidity), without significant variations. Thus, through follow-up, it is possible to understand aspects that influence development, to ensure the success of individuals until sexual maturation. As a sample number we obtained an N=50, among these, some arranged in the arthropod vivarium via the external environment and a large majority built internally by pregnant females. To effect the hatching of the oothecae, they were allocated in a nursery, with substrates and essential materials that mimic a natural, dark and humidified environment. Thus, 40 oothecae were designated internally, being thirty-three viable, six not viable and one partially viable, the remaining 10 came from the external environment with seven viable and three not viable. In general, the number of individualized individuals ranged from 9 to 1652, with hatching times ranging from 17 to 74 days and dates from hatching to the effective individualizing action from 14 to 45 days. The dimensioning of the volume and weight of the eggs was also defined through previously established formulas. Therefore, when comparing with other results, it was noticed that the number of individuals exceeded expectations and the hatching date fit the observed, with only one outline in the research sample.