Banca de QUALIFICAÇÃO: GUSTAVO COLAÇO GONÇALVES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : GUSTAVO COLAÇO GONÇALVES
DATE: 30/07/2021
TIME: 09:30
LOCAL: on-line
TITLE:

Morphology, ontogeny and systematics of Cycloramphidae Bonaparte, 1850 (Lissamphibia: Anura)

KEY WORDS:

Development, Evolution, Tadpoles

PAGES: 120
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Morfologia dos Grupos Recentes
SUMMARY:

In the most recent phylogenetic hypotheses, which include mostly molecular
data only, the genera Cycloramphus Tschudi and Thoropa Cope appear as
monophyletic, after the consequent synonymization of Zachaenus with Cycloramphus.
These same studies indicate that the family, which was once composed of several
genera and species, has been “redefined” to include only members of these two genera
with a distribution restricted to the Atlantic Forest, with species occurring from Bahia to
Rio Grande do Sul. Historically, morphological similarities of larvae and aspects of
reproductive biology have always drawn the attention of scholars of group to justify the
grouping of these species into a single family. As knowledge of these aspects was
precarious for most species, it is only recently that data were accumulated that allowed a
better understanding of the distribution of these characteristics. Two groups are
recognized among the Cycloramphidae, the first, composed of species that lay their eggs
on rocky outcrops, which a film of water flows and present exotrophic tadpoles. The
second grouping is composed of species that lay their eggs on the forest floor, burrows
or wet cavities and the larvae are endotrophic, with very distinct morphology and
development. Throughout the history of phylogenetic investigations that included the
species now recognized for the genera Cycloramphus and Thoropa, different
arrangements and hypothesis were presented, associating them with genera of different
families, however, with few exceptions, these studies had a poor taxonomic sampling or
used primarily or exclusively molecular data. Recent work has shown that previously
unconsidered morphological evidence represents the first evidence of this nature to
indicate that Cycloramphidae is monophyletic. However, efforts in the search for
morphological characteristics are rare, which in general take longer to be discovered
and have a decline in the training and education process of researchers. The general
objective of this project is to understand the phylogenetic relationships within the
Cycloramphidae family, and between historically related families and how aspects such
as morphology, diversity, development and reproduction are related to the evolution of
the group. In the present work, a survey of characters based on larval morphology will
be presented, expanding the observations of recent studies, and how these characters
influences the proposition of intra and interfamilial relationship hypotheses of
Cycloramphidae. I also present, as an auxiliary study, an investigation on the embryonic
and larval development of a species of each genus based on samples of C.
lithomimeticus and T. miliaris). This second study will support the proposition of
characters and, consequently, the use of phylogenetic hypotheses in the interpretation of
evolutionary sequences involving morphology and development.

BANKING MEMBERS:
Externo à Instituição - RENATO NEVES FEIO
Interna - 1217103 - ANA CLAUDIA DOS SANTOS BRASIL
Presidente - 387200 - FRANCISCO GERSON ARAUJO
Interno - 2289640 - HELIO RICARDO DA SILVA