Primeiro registro de Corvoheteromeyenia australis (Bonetto & Ezcurra de Drago) para o Brasil com chave taxonômica para os poríferos do Parque Estadual Delta do Jacuí, Rio Grande do Sul, Brasil

Late Pleistocene Climatic Changes in Central Brazil Indicated by Freshwater Sponges

“…Corvoheteromeyenia australis, for the first time identified in a spongillite-forming community, is endemic to South America and was described from living material collected in Argentina [46] [47]. Its occurrence in the Cemitério Palaeolake, from Phase I, and its absence in the current Serra Negra Lake [34], indicates that a colder climate prevailed in central Brazil during the formation of the Cemitério Palaeolake.…”

Freshwater sponges from the Pampa Biome, Brazil, with description of a new species of Oncosclera

“…Of the species of sponges identified in the EPA of Ibirapuitã, to date, only C. australis is restricted to the Pampa biome. Its occurrence extends from the north-east of the Pampa Biome, in Rio Grande do Sul State, to the Jacuí Delta (Tavares et al, 2003), the coastal lagoons surrounding the Patos Lagoon (Volkmer-Ribeiro et al, 2007a, 2007b, to the central area of the Argentine Pampa, in Setúbal Lake, Don Felipe Lake, and in waterbodies of Carabajal Island, Province of Santa Fe, all of which constitute environments within the Middle Paraná River flood- plain (Ezcurra de Drago, 1979). The restricted occurrence of C. australis in past aquatic environments of the Cerrado Biome corroborates the proposal put forward by Machado et al (2014).…”

“…The spicule set conformed to the original description of the species (Bonetto and Ezcurra de Drago, 1966) (Figure 3C). Remarks: To date, the records of C. australis are restricted to occurrences in the Pampa Biome, both in Argentina and in Rio Grande do Sul State, as well as in Lake Guaíba (Tavares et al, 2003) and downstream of it, in coastal lagoons surroundings the Laguna dos Patos (Volkmer-Ribeiro et al, 2007a, 2007b. However, sponge spicules from this species have recently been identified in lake sediments from the Pleistocene age in the State of Goiás, acting as an environmental indicator that the climate was previously colder in that region of the country (Machado et al, 2014 The sponge encrusts the solid rocky bottom or loose stones in the river, forming permanent crusts varying in thickness from thin to thick, with occasional needle-like projections of up to 15mm in height ( Figure 2D) with whitish, yellowish or greyish colouring ( Figure 2D).…”

“…The largest number of sponges detected at southern Brazil is in fact of the southern half of Rio Grande do Sul State's provenance, i.e. the Brazilian part of the Pampa Biome (De Rosa-Barbosa, 1984;Fontoura et al, 2004;Silva and Volkmer-Ribeiro, l998;Tavares et al, 2003, Volkmer-Ribeiro et al, 2007a, 2007b). It should be noted that these studies, particularly those obtained from the western edge of the Brazilian Pampa, are isolated, and in no way represent a comprehensive survey of the sponge fauna of the region, or even of the sampled water bodies.…”

From an Estuary to a Freshwater Lake: A Paleo-Estuary Evolution in the Context of Holocene Sea-Level Fluctuations, SE Brazil

“…Classification of spicules from marine sponges was based on Hooper and van Soest (2002). Identification of continental sponge spicules (gemmoscleres and microscleres) was based on Volkmer-Ribeiro and Machado (2007), Tavares et al (2003), and Volkmer- Ribeiro et al (2006). Spicules with no particular characteristics (megascleres), which make up the bulk of marine/continental sponge skeletons, whether smooth or spiny, were counted separately aiming to estimate the sponge abundance in the samples.…”