Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

New bizarre micro-spiriferid brachiopod from the Early Carboniferous of China

100%

Sun Y., Balinski A., Ma X., Zhang Y.

Acta Palaeontologica Polonica

|

2004

|

tom 49

|

nr 2

The verneuiliid brachiopod Changshunella yangi gen. et sp. nov. is described from the Early Carboniferous Muhua Formation of Guizhou, China. This rather unusual form is characterized by having very small shell dimensions (2.6–4 mm in length), a very high flat procline ventral interarea, and by having three prominent plications on both valves that are arranged in opposed folding; the last feature is characteristic for the family Verneuiliidae. We suggest that the family has been derived from an offshoot of the stock that produced the superfamilies Spiriferoidea, Paeckelmanelloidea, and Brachythyridoidea by developing opposed folding and loss of dental plates or dental adminicula as exemplified by Verneuilia and Changshunella gen. nov.

2

A new aviculopectinid bivalve from the Early Carboniferous of Guizhou, China

80%

Fang Z.-J., Sun Y., Balinski A.

Acta Palaeontologica Polonica

|

2006

|

tom 51

|

nr 3

Six silicified left valves including one nearly complete were obtained from acid residues of two samples collected from the Early Carboniferous Muhua Formation in Guizhou Province, China. The Chinese specimens have reticulate ornament and a large asymmetrical aviculopectinid−type resilifer and are much like Girtypecten from Permian rocks in the United States. However, the Chinese material shows only unicostate radial ornament, whereas Girtypecten is multicostate. Thus, a new taxon Girtypecten (Sinopecten) newelli subgen. et sp. nov. is proposed. The conodont assemblage occurring with G. (Sinopecten) newelli dates the new scallop as Tournaisian (the conodont Lower Siphonodella crenulata Zone); this is the oldest known occurrence of Girtypecten.

3

Tubular shell infestations in some Mississippian spirilophous brachiopods

80%

Balinski A., Sun Y.

Acta Palaeontologica Polonica

|

2010

|

tom 55

|

nr 4

Evidence of brachiopod shell infestation by tube dwelling parasitic–commensal organisms is very rare in the fossil record. The oldest record of this kind of biotic interaction is known as Eodiorygma acrotretophilia from the Early Cambrian phosphatic acrotretoid Linnarsonia. The youngest evidence of parasitic infestation was documented in the Early Cretaceous rhynchonellide Peregrinella multicarinata. Two other records of vermiform tubes inside brachiopod shells come from the Devonian. These are Diorygma atrypophilia, infesting Givetian atrypide shells, and Burrinjuckia spiriferidophilia, found in some Emsian spiriferides. Here we describe the fifth record of this kind of infestation for which a name Haplorygma dorsalis ichnogen. et ichnosp. nov. is proposed. The tubular infestation structure was revealed in two silicified dorsal valves of spirolophous brachiopods found in the Mississippian Muhua Formation of the Southern China. The affinity of the tube−dwelling organism is rather enigmatic, but its annelid relationship and kleptoparasitic nature seems highly probable. In addition, the phoronid affinity of Diorygma is here questioned.

Ograniczanie wyników

3 Acta Palaeontologica Polonica

3 Balinski A.

3 Sun Y.

1 Fang Z.-J.

1 Ma X.

1 Zhang Y.

1 2010

1 2006

1 2004

New bizarre micro-spiriferid brachiopod from the Early Carboniferous of China

A new aviculopectinid bivalve from the Early Carboniferous of Guizhou, China

Tubular shell infestations in some Mississippian spirilophous brachiopods