Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: lobopod

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

The lobopod Onychodictyon from the Lower Cambrian Chengjiang Lagerstatte revisited

100%

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

Acta Palaeontologica Polonica

2008

tom 53

nr 2

Onychodictyon ferox, from the Lower Cambrian Chengjiang Lagerstätte, is a worm−like armored lobopod with 10 pairs of dorsal plates and a pair of probable sensory appendages (“antennae”). Newly discovered complete specimens show that Onychodictyon is represented by two species: O. ferox with a “head” bearing a pair of dorsal “antennae” and a trunk with 11 pairs of limbs, whereas O. gracilis has a blunt anterior end without any appendages and a trunk with 12 pairs of limbs. Because of the close resemblance of the “antennae” of O. ferox and those of the lobopod Miraluolishania, they are considered to be homologous structures. The “antennae” of Cambrian lobopodians are proposed to be homologous with the arthropod antennulae.

A large xenusiid lobopod with complex appendages from the Lower Cambrian Chengjiang Lagerstatte

80%

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

Acta Palaeontologica Polonica

2006

tom 51

nr 2

A large lobopod, Jianshanopodia decora gen. et sp. nov., with body length (excluding appendages) about 220 mm from the Lower Cambrian Haikou section, near Kunming, Yunnan, southwest China, shows a mixture of characters, including features of the lobopod Xenusion Pompeckj, 1927, e.g., a large cylindrical body with annulations, stout and strong lobopod appendages each bearing bases of serial tubercles, and of Aysheaia Walcott, 1911, i.e., a pair of large frontal appendages. This suggests that the new genus might be a connecting link between Xenusion and Aysheaia. Besides, Jianshanopodia shares some features with the Early Cambrian stem group arthropod Pambdelurion Budd, 1997, and Kerygmachela Budd, 1993, e.g., the pairs of mid−gut diverticula, the possible presence of tail fan, the mouth cone, the frontal pharyngeal structures and the pharynax are surrounded by the bases of the large frontal appendages. However, compared with a series of segmentally arranged, imbricating, paddle−shaped, movable lateral flaps of both Pambdelurion and Kerygmachela, Jianshanopodia possesses distinct complex appendages with tree−like or lamellate branches. The discovery of this rare transitional form not only throws new light on the early diversification of lobopods, and may also have significance with respect to the origin of arthropods.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Han J.

2 Liu J.

2 Shu D.

2 Zhang X.

2 Zhang Z.

1 2008

1 2006

Wyniki wyszukiwania

The lobopod Onychodictyon from the Lower Cambrian Chengjiang Lagerstatte revisited

A large xenusiid lobopod with complex appendages from the Lower Cambrian Chengjiang Lagerstatte