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An enigmatic, possibly chemosymbiotic, hexactinellid sponge from the early Cambrian of South China

100%

Botting J. P., Muir L. A., Li X.-F., Lin J.-P.

Acta Palaeontologica Polonica

2013

tom 58

nr 3

Six specimens of a strongly curved, cylindrical hexactinellid sponge have been recovered from the Tommotian– Atdabanian Hetang Biota of South China, and are described as Decumbispongia yuani gen. et sp. nov. The robust, thick−walled sponge shows no evidence of an osculum or basal structures, and the body form is inconsistent with an upright, filter−feeding life position. Interpretations as a detritivore feeding by amoeboid extensions, or as a facultative chemosynthetic symbiosis of sponge and bacteria are considered. The latter interpretation is preferred due to the highly constrained body shape, and the body form is interpreted from this perspective. The species indicates that Cambrian sponges occupied at least some autecological niches that appear to have been vacant since that time.

Burgess Shale-type microfossils from the middle Cambrian Kaili Formation, Guizhou Province, China

88%

Harvey T. H. P., Ortega-Hernandez J., Lin J.-P., Yuanlong Z., Butterfield N. J.

Acta Palaeontologica Polonica

2012

tom 57

nr 2

Diverse carbonaceous microfossils, including exceptionally preserved remains of non−biomineralizing metazoans, are reported from a basal middle Cambrian interval of the Kaili Formation (Guizhou Province, China). The application of a gentle acid maceration technique complements previous palynological studies by revealing a larger size−class of acritarchs, a richer assemblage of filamentous microfossils, and a variety of previously unrecovered forms. Metazoan fossils include Wiwaxia sclerites and elements derived from biomineralizing taxa, including chancelloriids, brachiopods and hyolithids, in common with previously studied assemblages from the early and middle Cambrian of Canada. In addition, the Kaili Formation has yielded pterobranch remains and an assemblage of cuticle fragments representing “soft−bodied” worms, including a priapulid−like scalidophoran. Our results demonstrate the wide distribution and palaeobiological importance of microscopic “Burgess Shale−type” fossils, and provide insights into the limitations and potential of this largely untapped preservational mode.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Lin J.-P.

1 Botting J. P.

1 Butterfield N. J.

1 Harvey T. H. P.

1 Li X.-F.

1 Muir L. A.

1 Ortega-Hernandez J.

1 Yuanlong Z.

1 2013

1 2012

Wyniki wyszukiwania

An enigmatic, possibly chemosymbiotic, hexactinellid sponge from the early Cambrian of South China

Burgess Shale-type microfossils from the middle Cambrian Kaili Formation, Guizhou Province, China