O Paleolago Cemitério, Catalão, Goiás, é um depósito lacustre rico em espículas de esponjas continentais. Essas espículas, que estão presentes em três. This Pin was discovered by Joelma Martins Fonseca. Discover (and save!) your own Pins on Pinterest. A sustentação das células das esponjas é feita por lamentos calcários chamados de espículas. Nas esponjas também não há sistemas responsáveis pelas.
|Published (Last):||26 April 2011|
|PDF File Size:||9.48 Mb|
|ePub File Size:||5.35 Mb|
|Price:||Free* [*Free Regsitration Required]|
Paleolimnology of three species of freshwater sponges Porifera: Optically stimulated luminescence dating of young sediments. Vanessa de Souza Machado E-mail: The authors concluded that, during this time period, the weather conditions were probably on average better for the development of forests, but these developments were regularly interrupted by fire since the presence of C.
Eunapius fragilis Penney and Racek Trochospongilla variabilis Bonetto and Ezcurra de Drago Fig. For the Optical Microscope OM identification of the sponge spicules in the sediments, a specific laboratory technique was applied to obtain permanent slides.
Few spicules, differing from that of Layer 1 by the absence of E. New fresh-water sponges from Amazonian waters. Corvomeyenia thumi Volkmer-Ribeiro History and classification of the know species of Spongilla.
Iheringia, Ser Zool 97 2: Tubella spinata Carter The spongofacies technique of Parolin et al. Trans Am Microsc Soc 99 1: The gemmoscleres, which are the spicules of the gemmules, are the most important morphological character in the characterization of families, genera and species.
Few spicules of E. Rev Bras Zool 24 3: Eunapius fragilis Leidy Fig. Metania spinata Volkmer-Ribeiro With the exception of the last two, these species are abundant in the rocks and exhibit a prolonged stratigraphic range in the three analyzed sections Figs.
Oncosclera navicella Volkmer-Ribeiro At that time, the term “spongofacies” was proposed and defined for facies with a predominance of sponge spicules that, when identified, indicate specific paleoenvironmental characteristics. Iheringia, Ser Zool 4: Rev Bras Paleontol 12 2: The accumulation of humic substances, which resulted from a natural process of eutrophication caused by the production of macrophyte vegetation in the basin, would contribute to the accelaration of an erosive karstic process that leads to subsidence at the bottom of lakes.
Furthermore, they highlighted the moment when the gemmoscleres of H. Samples were collected from the three sites from top to bottom, with 21, 19 and 13 collected layers at Sites 1, 2 and 3, respectively Figs. Corvomeyenia thumi Traxler Fig. Metania spinata Carter Fig. Few spicules of C. Spicules of the freshwater sponge Ephydatia facunda indicate lagoonal paleoenvironment at the pampas of Buenos Aires Province, Argentina.
Few spicules of M. Volkmer-Ribeiro also reported this same assemblage, with the exception of H. The ages obtained by N.
Espiculas de esponja | Biologia de inverterbrados | Pinterest
Except for the species C. The alternation of clay Layers 2, 3, 4, 6, 8, 9, 10, 12, 13, 15 and 16, Section 2 and conglomerates Layers 1, 5, 7, 11 and 14, Section 2 is indicative of such a process Fig. S spongofacies abundant spicules, according to the definition proposed by Parolin et al.
Acta Zool Lilloana Three stratigraphic columns were recorded in distinct localities along the exposure. They also pointed to a relationship between this deposit and transgressive events prior espicuals the studied formation.
Continental sponges Phylum Porifera are animals that can be found in any, permanent or temporary, body of fresh water under natural conditions, e. Redescription of two Neotropical species.
The second hypothesis involves a small-scale localized collapse, which could result in a reduction in the volume of the rock that causes subsidence. Likewise important are microscleres and megascleres, which are the spicules that make up the body of the animal. Fossil freshwater sponges Porifera: Last, but not least, the authors aknowledge the valuable suggestions offered by two anonymous referees. Thus, they concluded that there had been a lentic habitat marginal to the river caused by pulses of flooding of the river, which were well defined by the punctuated presence of spicules of C.
Rev Bras Paleontol 10 1: Demospongiaeindicators of some typical coastal habitats at South America: The specimens were espiculss near the mouths of streams, exposed to considerable flowing water Ezcurra de Drago op cit.
Few spicules, as in Layer Spongofacies as in Layer 5. Variations of the Amazonian rainforest environment: Spicular remains of fresh-water sponges Porifera. Rare spicules of E.