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Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series od South China

100%

Chen Z. Q., Campi M. J., Shi G. R., Kaiho K.

Acta Palaeontologica Polonica

2005

tom 50

nr 2

This paper describes fourteen brachiopod species in eleven genera from the Late Permian Wuchiapingian Coal Series (Lungtan Formation) of South China. Of these, the shell bed fauna from the basal Lungtan Formation is interpreted to represent the onset of the recovery of shelly faunas in the aftermath of the Guadalupian/Lopingian (G/L) mass extinction in South China. The post−extinction brachiopod faunas in the Wuchiapingian are characterized by the presence of numerous Lazarus taxa, survivors, and newly originating taxa. These elements capable of adapting their life habits were relatively more resistant to the G/L crisis. The post−extinction faunas, including survivors and the elements originating in the recovery period, have no life habit preference, but they were all adapted to a variety of newly vacated niches in the Late Permian oceans. Two new species, Meekella beipeiensis and Niutoushania chongqingensis, are described, and two Chinese genera, Niutoushania and Chengxianoproductus, are emended based on re−examination of the type specimens and new topotype materials from the Lungtan Formation.

A new basal actinopterygian fish from the Anisian (Middle Triassic) of Luoping, Yunnan Province, Southwest China

64%

Wen W., Zhang Q.-Y., Hu S.-X., Zhou C.-Y., Xie T., Huang J.-Y., Chen Z. Q., Benton M. J.

Acta Palaeontologica Polonica

2012

tom 57

nr 1

The new neopterygian fish taxon Luoxiongichthys hyperdorsalis gen. et sp. nov. is established on the basis of five specimens from the second member of the Guanling Formation (Anisian, Middle Triassic) from Daaozi Quarry, Luoping, Yunnan Province, Southwest China. The new taxon is characterized by the following characters: triangular body outline with a distinct apex located between skull and dorsal fin; free maxilla; slender preopercular almost vertical; three suborbitals; at least eight strong branchiostegals with tubercles and comb−like ornamentation on the anterior margin; clavicles present; two postcleithra; ganoid scales covered by tubercles and pectinate ornamentation on the posterior margin with peg−and−socket structure; hemiheterocercal tail slightly forked. Comparison with basal actinopterygians reveals that the new taxon has parasemionotid−like triangular symplectics, but a semionotid opercular system. Cladistic analysis suggests that this new genus is a holostean, and either a basal halecomorph or basal semionotiform.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Chen Z. Q.

1 Benton M. J.

1 Campi M. J.

1 Hu S.-X.

1 Huang J.-Y.

1 Kaiho K.

1 Shi G. R.

1 Wen W.

1 Xie T.

1 Zhang Q.-Y.

1 Zhou C.-Y.

1 2012

1 2005

Wyniki wyszukiwania

Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series od South China

A new basal actinopterygian fish from the Anisian (Middle Triassic) of Luoping, Yunnan Province, Southwest China