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Early Cambrian 'soft-shelled' brachiopods as possible stem-group phoronids

100%

Balthasar U., Butterfield N. J.

Acta Palaeontologica Polonica

2009

tom 54

nr 2

307-314

Brachiopods and phoronids are widely recognised as closely related lophophorate phyla, but the lack of morphological intermediates linking the bivalved bodyplan of brachiopods with tubular phoronids has frustrated precise phylogenetic placement. Here we describe Lingulosacculus nuda gen. et sp. nov., a new “soft−shelled” brachiopod from the Early Cambrian Mural Formation of western Alberta which provides a plausible candidate for a phoronid stem−group within (paraphyletic) Brachiopoda. In addition to its non−biomineralised shell, L. nuda had a ventral valve with an exceptionally long, pocket−like extension (pseudointerarea) that would have allowed the transformation of criss−crossing brachiopod−type musculature to the longitudinal arrangement typical of phoronids. “Soft−shelled” linguliform brachiopods have previously been reported from both the Chengjiang and Burgess Shale Lagerstätten which, together with L. nuda, probably represent two independent losses of shell mineralisation in brachiopods.

Wczesna filogeneza zwierzat tkankowych w zapisie kopalnym

88%

Dzik J.

Kosmos

1996

tom 45

nr 4

657-686

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Kosmos

1 Balthasar U.

1 Butterfield N. J.

1 Dzik J.

1 2009

1 1996

Wyniki wyszukiwania

Early Cambrian 'soft-shelled' brachiopods as possible stem-group phoronids

Wczesna filogeneza zwierzat tkankowych w zapisie kopalnym