An early Cambrian agglutinated tubular lophophorate with brachiopod characters.

Z-F Zhang; G. X. Li; L. E. Holmer; G. A. Brock; U. Balthasar; C. B. Skovsted; D. J. Fu; X-L Zhang; H. Z. Wang; A. Butler; Z-L Zhang; C. Q. Cao; J. Han; J. N. Liu; D. G. Shu

doi:10.1038/srep04682

An early Cambrian agglutinated tubular lophophorate with brachiopod characters.

Z-F Zhang, G. X. Li, L. E. Holmer, G. A. Brock, U. Balthasar, C. B. Skovsted, D. J. Fu, X-L Zhang, H. Z. Wang, A. Butler, Z-L Zhang, C. Q. Cao, J. Han, J. N. Liu, D. G. Shu

School of Geography, Earth and Environmental Sciences

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Abstract

The morphological disparity of lophotrochozoan phyla makes it difficult to predict the morphology of the last common ancestor. Only fossils of stem groups can help discover the morphological transitions that occurred along the roots of these phyla. Here, we describe a tubular fossil Yuganotheca elegans gen. et sp. nov. from the Cambrian (Stage 3) Chengjiang Lagerstätte (Yunnan, China) that exhibits an unusual combination of phoronid, brachiopod and tommotiid (Cambrian problematica) characters, notably a pair of agglutinated valves, enclosing a horseshoe-shaped lophophore, supported by a lower bipartite tubular attachment structure with a long pedicle with coelomic space. The terminal bulb of the pedicle provided anchorage in soft sediment. The discovery has important implications for the early evolution of lophotrochozoans, suggesting rooting of brachiopods into the sessile lophotrochozoans and the origination of their bivalved bauplan preceding the biomineralization of shell valves in crown brachiopods.

Original language	English
Number of pages	0
Journal	Sci Rep
Volume	4
Issue number	0
DOIs	https://doi.org/10.1038/srep04682
Publication status	Published - 15 May 2014

Keywords

Animals
Biological Evolution
China
Fossils
Invertebrates
Phylogeny

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10.1038/srep04682

An early Cambrian agglutinated tubular lophophorate with brachiopod characters

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title = "An early Cambrian agglutinated tubular lophophorate with brachiopod characters.",

abstract = "The morphological disparity of lophotrochozoan phyla makes it difficult to predict the morphology of the last common ancestor. Only fossils of stem groups can help discover the morphological transitions that occurred along the roots of these phyla. Here, we describe a tubular fossil Yuganotheca elegans gen. et sp. nov. from the Cambrian (Stage 3) Chengjiang Lagerst{\"a}tte (Yunnan, China) that exhibits an unusual combination of phoronid, brachiopod and tommotiid (Cambrian problematica) characters, notably a pair of agglutinated valves, enclosing a horseshoe-shaped lophophore, supported by a lower bipartite tubular attachment structure with a long pedicle with coelomic space. The terminal bulb of the pedicle provided anchorage in soft sediment. The discovery has important implications for the early evolution of lophotrochozoans, suggesting rooting of brachiopods into the sessile lophotrochozoans and the origination of their bivalved bauplan preceding the biomineralization of shell valves in crown brachiopods.",

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author = "Z-F Zhang and Li, {G. X.} and Holmer, {L. E.} and Brock, {G. A.} and U. Balthasar and Skovsted, {C. B.} and Fu, {D. J.} and X-L Zhang and Wang, {H. Z.} and A. Butler and Z-L Zhang and Cao, {C. Q.} and J. Han and Liu, {J. N.} and Shu, {D. G.}",

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AU - Zhang, Z-F

AU - Li, G. X.

AU - Holmer, L. E.

AU - Brock, G. A.

AU - Balthasar, U.

AU - Skovsted, C. B.

AU - Fu, D. J.

AU - Zhang, X-L

AU - Wang, H. Z.

AU - Butler, A.

AU - Zhang, Z-L

AU - Cao, C. Q.

AU - Han, J.

AU - Liu, J. N.

AU - Shu, D. G.

PY - 2014/5/15

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N2 - The morphological disparity of lophotrochozoan phyla makes it difficult to predict the morphology of the last common ancestor. Only fossils of stem groups can help discover the morphological transitions that occurred along the roots of these phyla. Here, we describe a tubular fossil Yuganotheca elegans gen. et sp. nov. from the Cambrian (Stage 3) Chengjiang Lagerstätte (Yunnan, China) that exhibits an unusual combination of phoronid, brachiopod and tommotiid (Cambrian problematica) characters, notably a pair of agglutinated valves, enclosing a horseshoe-shaped lophophore, supported by a lower bipartite tubular attachment structure with a long pedicle with coelomic space. The terminal bulb of the pedicle provided anchorage in soft sediment. The discovery has important implications for the early evolution of lophotrochozoans, suggesting rooting of brachiopods into the sessile lophotrochozoans and the origination of their bivalved bauplan preceding the biomineralization of shell valves in crown brachiopods.

AB - The morphological disparity of lophotrochozoan phyla makes it difficult to predict the morphology of the last common ancestor. Only fossils of stem groups can help discover the morphological transitions that occurred along the roots of these phyla. Here, we describe a tubular fossil Yuganotheca elegans gen. et sp. nov. from the Cambrian (Stage 3) Chengjiang Lagerstätte (Yunnan, China) that exhibits an unusual combination of phoronid, brachiopod and tommotiid (Cambrian problematica) characters, notably a pair of agglutinated valves, enclosing a horseshoe-shaped lophophore, supported by a lower bipartite tubular attachment structure with a long pedicle with coelomic space. The terminal bulb of the pedicle provided anchorage in soft sediment. The discovery has important implications for the early evolution of lophotrochozoans, suggesting rooting of brachiopods into the sessile lophotrochozoans and the origination of their bivalved bauplan preceding the biomineralization of shell valves in crown brachiopods.

KW - Animals

KW - Biological Evolution

KW - China

KW - Fossils

KW - Invertebrates

KW - Phylogeny

UR - https://pearl.plymouth.ac.uk/context/gees-research/article/1843/viewcontent/An_20early_20Cambrian_20agglutinated_20tubular_20lophophorate_20with_20brachiopod_20characters.pdf

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An early Cambrian agglutinated tubular lophophorate with brachiopod characters.

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Keywords

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