Taxonomia e padrões de distribuição de cascudinhos do gênero Hypoptopoma do grupo gulare (Siluriformes, Loricariidae) na Bacia Amazônica
The genus Hypoptopoma comprises eight valid species, being a group of the subfamily Hypoptopomatinae (Loricariidae), which is widely distributed in South America, from Venezuela to Argentina. Within the genus, the Hypoptopoma gulare group is composed by species with long pectoral spine and only t...
| Autor principal: | Queiroz, Luiz Jardim de |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11341 http://lattes.cnpq.br/0698197143770279 |
| Resumo: |
|---|
|
The genus Hypoptopoma comprises eight valid species, being a group of the
subfamily Hypoptopomatinae (Loricariidae), which is widely distributed in South
America, from Venezuela to Argentina. Within the genus, the Hypoptopoma gulare
group is composed by species with long pectoral spine and only two rows of
complete abdominal plates, which are: H. gulare, H. joberti and H. steindachneri from
Amazon, and H. inexspectatum from Paraná-Paraguay. Nevertheless, the specifics
and geographical boundaries of these species remain unclear. Thus, this work aimed
to revise the taxonomic composition of this group in the Amazon basin. Morphometric
analyses (using measurements and counts) of the preserved specimens from
ichthyological collections identified five morphotypes. One was associated to the
nominal species, H. gulare, and the others were considered undescribed:
Hypoptopoma sp. n. “Urucu”, Hypoptopoma sp. n. “Trombetas”, Hypoptopoma sp. n.
“anão” e H. sp. n. “Marajó. In this revision it is suggested that H. steindachneri and H.
joberti are junior synonymies of H. gulare. The geographic distribution of this species
is expanded from Marañon/Ucayali to the Madeira Basin. The pattern of
morphological variation found in H. gulare suggests the existence of a morphological
(or phenotypical) cline, with a gradient of variation from upstream to downstream. |