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A remarkable new Middle Sandbian (Ordovician) hexactinellid sponge in Baltic erratics Naturalis
Botting, J.P.; Rhebergen, F..
A new species of complex hexactinellid sponge, Haljalaspongia inaudita, is described from fluvially transported blocks found in northwestern Germany, near the Dutch border, but which probably originated from the eastern Baltic region. The heavily folded wall is composed of multiple spicule layers, including dermal and gastral layers of acanthohexactines, and a central layer of sub-parallel monaxons. The monaxial layer is lined on one side by a reticulate array of smooth monaxons. The sponge is difficult to assign to any known fossil or recent group, but shares some features with the dictyospongioid family Docodermatidae.
Tipo: Article / Letter to the editor Palavras-chave: Porifera; Spicules; Dictyospongioidea; Acanthohexactine; Baltica; Erratic; 38.22; 42.72.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/428479
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Environmental factors related to the production of a complex set of spicules in a tropical freshwater sponge Anais da ABC (AABC)
MATTEUZZO,MARCELA C.; VOLKMER-RIBEIRO,CECÍLIA; VARAJÃO,ANGÉLICA F.D.C.; VARAJÃO,CÉSAR A.C.; ALEXANDRE,ANNE; GUADAGNIN,DEMETRIO L.; ALMEIDA,ARIANA C.S..
ABSTRACT Adverse natural conditions will, generally, induce gemmulation in freshwater sponges. Because of this environmental dependence, gemmoscleres are given exceptional value in taxonomic, ecological and paleoenvironmental studies. Other spicules categories such as microscleres and beta megascleres have received little attention with regard to their occurrence and function during the sponge biological cycle. Metania spinata, a South American species common to bog waters in the Cerrado biome, produces alpha and beta megascleres, microscleres and gemmoscleres. To detect the environmental factors triggering the production of all these kinds of spicules, the species annual seasonal cycle was studied. Artificial substrates were devised, supplied with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Field monitoring; Metania spinata; Paleointerpretations; Spicules.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502013
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Inventary of the Sponge Fauna of the cemitério Paleolake, Catalão, Goiás, Brazil Anais da ABC (AABC)
Machado,Vanessa de Souza; Volkmer-Ribeiro,Cecilia; Iannuzzi,Roberto.
The Cemitério Paleolake, Catalão, Goiás, is a lacustrine deposit that is rich in spicules of continental sponges. These spicules, which are present in three sections (1-3), were analyzed for the taxonomic identification of the species in order to reconstruct the late Quaternary palaeoenvironment. An indigenous assemblage of lentic sponges was found, consisting of Metania spinata (Carter 1881), Dosilia pydanieli Volkmer-Ribeiro (1992), Radiospongilla amazonensis Volkmer-Ribeiro and Maciel (1983), Trochospongilla variabilis Bonetto and Ezcurra de Drago (1973), Corvomeyenia thumi (Traxler 1895), Heterorotula fistula Volkmer-Ribeiro and Motta (1995), plus Corvoheteromeyenia australis (Bonetto and Ezcurra de Drago 1966), which here has its first record in an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado Biome; Continental sponges; Quaternary paleointerpretations; Sediments; Spicules.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100004
Registros recuperados: 3
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