doctoralThesis
Taxonomia integrativa e biogeografia dos cascudinhos da subfamília Hypoptopomatinae (Siluriformes: Loricariidae) do Nordeste do Brasil
Fecha
2020-06-05Registro en:
BARROS NETO, Luciano de Freitas. Taxonomia integrativa e biogeografia dos cascudinhos da subfamília
Hypoptopomatinae (Siluriformes: Loricariidae) do Nordeste do Brasil. 2020. 185f. Tese (Doutorado em Sistemática e Evolução) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2020.
Autor
Barros Neto, Luciano de Freitas
Resumen
The Northeastern region of Brazil, which includes five distinct hydrographic ecoregions,
is suitable for river captures mainly because of lithological and geological characteristics
as well as successive fault reactivation phases. However, the biogeographic history of
neotropical watersheds in this region remains poorly understood despite their high levels
of fish endemism. The genus Parotocinclus presents high number of endemic species in
the region, with some species with distribution restricted to a single basin, while others
with wider distributions, occurring in more than one ecoregion. In this sense, unravelling
the evolutionary history of the genus Parotocinclus can help elucidate the historical
processes that influenced the genetic variation of freshwater fish in these coastal basins.
However, the validity of some species is questioned. Moreover, most of the species
descriptions for the genus are little informative, and do not present diagnostic characters
that enable the recognition of specific complexes. For instance, some other authors
considered P. cearensis and P. cesarpintoi as junior synonyms of P. spilosoma. However,
tests performed with material recently collected in type localities, as well as type series
data, revealed some morphological characters that can be used to differentiate these
species. Phylogenetic analyses with molecular data were contrasted with morphological
and biogeographic data. As a result of this integrative analysis (morphology and
molecular), in first chapter the validity of Parotocinclus cearensis was confirmed by
differentiating it from P. spilosoma and P. cesarpintoi. The redescriptions of P. cearensis,
P. cesarpintoi and P. spilosoma are presented, adding new diagnostic characters for each
species. In the second chapter I addressed the relationships among species, identified
possible new species, and investigated the diversification of lineages within the genus in
Brazilian Northeast. I evaluated which events may be associated with the bioogeographic
patterns recovered. In the third chapter, I described a new genus in the subfamily
Hypoptomatinae, with four new, geographically isolated species supported by
morphological and molecular data.