Banca de DEFESA: MATHEUS ARTHUR LÚCIO DA ROCHA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MATHEUS ARTHUR LÚCIO DA ROCHA
DATE: 30/07/2021
TIME: 14:00
LOCAL: Google Meet
TITLE:

Iterative taxonomy of troglobite crustaceans of the genus Potiberaba Fišer, Zagmajster & Ferreira 2013 (Crustacea: Amphipoda) in the Caatinga

KEY WORDS:

Mesogammaridae, Underground Crustaceans, Morphology, Genetics, Jandaíra Formation

PAGES: 53
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Taxonomia dos Grupos Recentes
SUMMARY:

Underground systems can be found in several mineral formations, sheltering a fauna with different life strategies, which together can use the underground environment permanently or temporarily. Among these inhabitants, the troglobites stand out, a group that brings together organisms that present a series of ecological, physiological, morphological and behavioral adaptations associated with the underground environment. In Brazil, the troglobite fauna has been described with greater intensity in the last two decades, with the prospect of new places and the integration of different analytical tools. Despite this, the South and Southeast regions still stand out at the expense of the others, concentrating most of the taxonomic, ecological and genetic studies of troglobite organisms. However, the Northeast, especially the state of Rio Grande do Norte (RN), has stood out in terms of knowledge of this fauna, with the discovery of new species of troglobite invertebrates, such as crustaceans, flatworms and insects. Among the new organisms described in RN, there is the amphipod genus Potiberaba, monotypic and endemic to caves in the region, which for seven years had a distribution restricted to the type locality. After new expeditions, specimens were registered in another eleven locations, and whose molecular data indicated possible new species in caves in the region. Until then, the hypothesis was based only on delimitations using a mitochondrial marker. Thus, through an integrated approach between molecular (including nuclear markers) and morphological tools, the study proposed to assess the convergence between different information to support the hypothesis of a complex of species, as well as to identify morphological characters capable of distinguishing. las, and at the end, propose the description of the new species of Potiberaba. Through an iterative approach between morphological information and molecular markers (cox1 and 28S), the study proposes the existence of five allopatric species, four of which have a restricted distribution, with low genetic and morphological diversity, while P. porakuara is widely found in the south of the Jandaíra Formation. The study also indicated that in addition to genetic divergences, the strains can be identified through morphological characters with a high hit rate, showing that the species richness of this formation is underestimated.

BANKING MEMBERS:
Externo à Instituição - ANDRÉ RESENDE DE SENNA - UERJ
Externo à Instituição - PAULO CESAR DE PAIVA - UFRJ
Presidente - 1865104 - SERGIO MAIA QUEIROZ LIMA