Análise filogenética dos caranguejos dulcícolas da família Trichodactylidae (Crustacea: Decapoda: Brachyura) com base no estudo morfológico-anatômico do esqueleto gástrico
Trichodactylidae are believed to have a separate phylogenetic origin from other freshwater crab families. Representatives of this family have morphological characteristics that diagnose them from other families of freshwater crabs: different body shape; absence of thorns in the dactylus and propo...
| Autor principal: | Lima-Gomes, Renata Cristina de |
|---|---|
| Grau: | Tese |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11492 http://lattes.cnpq.br/7988428010388754 |
| Resumo: |
|---|
|
Trichodactylidae are believed to have a separate phylogenetic origin from other freshwater
crab families. Representatives of this family have morphological characteristics that diagnose them
from other families of freshwater crabs: different body shape; absence of thorns in the dactylus and
propodus; of the third narrow maxilliped merus. The family has 49 species distributed in two
subfamilies and 15 genera. The suprageneric classification of the family was proposed based on the
abdômenn characters, the first male pleopod (gonopod), and the axial skeleton. Due to its structural
complexity, the gastric skeleton has been used as a source of morphological information for
taxonomic and phylogenetic studies in different brachyuran groups. From the analysis of stomachs
of 42 species (32 in the ingroup and 10 in the outgroup) the morphology of the ossicles of the gastric
skeleton was described and illustrated. The cladistic analysis of Trichodactylidae was performed
with the program Winclada and TNT. It was used 57 binary characters obtained from the gastric
ossicle morphology. The cladistic analysis of this study resulted in two equally parsimonious trees
with 343 steps each. The analyzes did not recover the monophyly of the family and did not result in
the formation of clades, except in the cases of Avotrichodactylus and Moreirocarcinus. Even in this
scenario, it is believed that gastric mill ossicle characters may be complementary elements in the
analysis of family affinities. For this, it will be important to carry out new studies that include,
besides characters the gastric skeleton, characters carapace, abdômenn, appendages, reproductive
structures and the axial skeleton. A cladistic analysis that integrates these various morphological
aspects will certainly have a much greater potential to better define clusters and elucidate their
affinities both intra- and extrafamily. |