Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Lingulellotreta malongensis

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Soft-tissue preservation in the Lower Cambrian linguloid brachiopod from South China

100%

Zhang Z., Han J., Zhang X., Liu J., Shu D.

Acta Palaeontologica Polonica

2004

tom 49

nr 2

The organization of the lophophore and the digestive system are recognized as two of the diagnostic characters in the definition of higher brachiopod taxa, and hence play a major role in their phylogenetic analysis, their structure, however, is very rarely fossilized. Here we describe and interpret specimens of the brachiopod Lingulellotreta malongensis, from the Lower Cambrian Chengjiang Lagerstätte (South China), one of the earliest known taxa of the Lingulellotretidae, in which lophophores and intact, U−shaped digestive tracts are extraordinarily well−preserved. The lophophore, with clearly preserved tentacles, corresponds to an early spirolophe developmental stage. The digestive tract consists of a mouth, esophagus, distended stomach, intestine and an anterior anus, and differs from that of the Chengjiang obolid Lingulella chengjiangensis by the presence of the dilated stomach and by the absence of a looped intestine as in Lingula. In addition, the relative sizes of the mantle and visceral cavities of Lingulellotreta malongensis also are described. These fossils demonstrate that by the Atdabanian brachiopods had already possessed advanced features, and suggest that a lophophore and a U−shaped intestine with an anterior anus are brachiopod plesiomorphies.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Han J.

1 Liu J.

1 Shu D.

1 Zhang X.

1 Zhang Z.

1 2004

Wyniki wyszukiwania

Soft-tissue preservation in the Lower Cambrian linguloid brachiopod from South China