Navegando por Assunto "Zoologia sistemática"

Agora exibindo 1 - 6 de 6

Acesso aberto (Open Access)
Estudo ontogênico e taxonômico das larvas de algumas espécies de peixes da região Norte do Brasil
(Universidade Federal do Pará, 2009-08) ANUNCIAÇÃO, Erica Moema Silva da; SARPEDONTI, Valérie; http://lattes.cnpq.br/2358097649881792
This study aimed to provide information on the morphological description of the species and ontogenetic Plagioscion squamosissimus (Sciaenidae), Cynoscion acoupa (Sciaenidae), Colomesus pscitacus (Tetraodontidae) and Oligoplites palometa (Carangidae) from the northern region of Brazil. All individuals were analyzed for the integrity of their structures and subsequently identified. From the identification of each species, individuals were analyzed for their morphological, meristic, morphometric. To study the ontogenic were determined inflection points in the growth of structures, the development stages and their critical periods, then a PCA was performed for better visualization of the characters that best define the larval growth. The results indicated that the relative growth (depending on total length (TL) of the body parts studied followed negative allometry. The three stages of larval development defined depending on the ontogenic process differed between species in spite of their similarities in the chronology of the development body. So the initial development phase of the four species in F1 favors the anterior portion of the larvae while the back of the body showed the highest growth rate at the end of the larval stage. The two species of Sciaenidae Cynoscion acoupa and Plagioscion squamosissimus differ in the shape of the mouth and CT were observed when the first teeth, the differences also in the sequence of development of the fins, pigmentation in the presence and location of spines and body proportions. Colomesus pscitacus observed the occurrence of ossified teeth soon after hatching, this species occurs also the early appearance of the fins, pigmentation and maintaining body relation (characterizing the spherical shape of the body). Oligoplites palometa The species showed the pattern of development of the fins similar to those described for other species of this family which is associated as a standard characteristic for this family, as well as the presence of intense pigmentation and spines on opercular region and supra-occipital.
Acesso aberto (Open Access)
Revisão taxonômica de Electrophorus Gill, 1864 (Gymnotiformes, Gymnotidae) com descrição de quatro espécies novas
(Universidade Federal do Pará, 2010) CASTRO, Natália de Castro e; WOSIACKI, Wolmar Benjamin; http://lattes.cnpq.br/0040413891328104
Acesso aberto (Open Access)
Revisão taxonômica de Gymnorhamphichthys (Gymnotiformes, Rhamphichthyidae) com descrição de duas novas espécies
(Universidade Federal do Pará, 2010) RAMOS, Cristiane do Socorro; WOSIACKI, Wolmar Benjamin; http://lattes.cnpq.br/0040413891328104
A taxonomic revision of the genus Gymnorhamphichthys is presented, a diagnosis for the genus is modified and expanded, five nominal species are recognized, and two new species are described: Gymnorhamphichthys sp. n. 1, from rivers of Paraguay basin, is diagnosed by thin bars on the dorsal region of its body, bars long slender reaching or exceeding below the lateral line, number of bars 6-19, and by the low number of anal rays (141-177), among other characters; Gymnorhamphichthys sp. n. 2, from Amazon basin, is diagnosed by the presence of a dark mask on the head, wide rectangular-shaped bars, and by the high number of anal rays (185-260), among other characters. A dichotomous key to species is provided.
Acesso aberto (Open Access)
Sistemática e diversificação dos gêneros Hylopezus e Myrmothera (Aves:Grallariidae)
(Universidade Federal do Pará, 2015-03-31) CARNEIRO, Lincoln Silva; ALEIXO, Alexandre Luis Padovan; http://lattes.cnpq.br/3661799396744570
Acesso aberto (Open Access)
Sistemática molecular, biogeografia e taxonomia do gênero Megascops kaup, 1848 (Aves, Strigidae)
(Universidade Federal do Pará, 2013-06-28) DANTAS, Sidnei de Melo; ALEIXO, Alexandre Luis Padovan; http://lattes.cnpq.br/3661799396744570
Acesso aberto (Open Access)
Variação morfológica, vocal e molecular em Hylopezus macularius (Temminck, 1830) (Aves, Grallariidae)
(Universidade Federal do Pará, 2009) CARNEIRO, Lincoln Silva; GONZAGA, Luiz Antonio Pedreira; http://lattes.cnpq.br/7163872808115319; ALEIXO, Alexandre Luis Padovan; http://lattes.cnpq.br/3661799396744570
A systematic revision of the polytypic Spotted Antpitta (Hylopezus macularius, Grallariidae) based on morphometric, plumage, vocal, and molecular characters is presented. Morphological and vocal analyses were based, respectively, on 45 specimens and 104 recordings. Molecular phylogenies were inferred based on ca. 1.371 bp of the mitochondrial DNA genes 16S, ND2, and cyt b belonging to 26 specimens, including several outgroups. Our results revealed the existence of an undescribed taxon endemic to the Madeira – Xingu interfluve, cryptically similar in morphology to paraensis, but vocally and genetically readily distinguished from the latter and any other taxon grouped under H. macularius. Molecular trees obtained recovered with strong support the reciprocal monophyly among four main lineages of the Spotted Antpitta, three corresponding to already named taxa (dilutus, macularius, and paraensis), and one to the unnamed taxon, which is described herein. We show that those four taxa are also mutually diagnosed by a combination of both vocal and morphological features, and therefore recommend treating them as separate species. Dating of the molecular trees indicated that splits among species of the Spotted Antpitta complex took place between 2.92 and 0.78 mya, with the older splits concentrated in northwestern Amazonia (across the Negro and upper Amazon rivers) and the most recent ones in the southeastern part of the basin (across the Xingu river).