Wyniki wyszukiwania

1

The spicules of sponges from Lower Cretaceous of the Polish lowlands

100%

Sztejn J.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1995

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tom 43

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nr 3

2

Muscular arrangement and sclerite morphology in the haptor of Tetraonchus monenteron (Monogenea, Dactylogyridea)

84%

Petrov A. A., Gerasev P.

Acta Parasitologica

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2019

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tom 64

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nr 1

3

Holothurian sclerites from the Miocene deposits of the Gliwice Area [Upper Silesia, Poland]

84%

Gorka H.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1997

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tom 45

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nr 2-4

4

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Trachyplax arctica, a new multiplated problematic fossil from the Lower Cambrian of North Greenland

67%

Larsson C. M., Peel J. S., Hogstrom A. E. S.

Acta Palaeontologica Polonica

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2009

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tom 54

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nr 3

513-523

A new scleritome−bearing organism with eight sclerite types, Trachyplax arctica gen. et sp. nov., is described from the lower Cambrian Paralledal Formation of North Greenland. The originally calcareous sclerites are now silicified; no microstructures are preserved. The dominant sclerite type (A; maximum dimension 19.3 mm) is bilaterally symmetrical, strongly arched, with an oval shield showing co−marginal growth lines and a projecting rostrum with prominent radial ornamentation. A similar sclerite morphology can be identified in Silurian–Carboniferous multiplacophoran molluscs but the remaining sclerite types, which also display a combination of concentric and radial ornamentation, find no clear equivalents. Two models for scleritome reconstruction are presented, based on the relative abundance of the sclerites, but neither promotes a satisfactory assignment to a higher taxon. Despite the morphological dissimilarities, possibly reflecting the age discrepancy, reference to the Multiplacophora is most attractive and entails a substantial extension of the known geological range of that group.

5

The tommotiid Camenella reticulosa from the Early Cambrian of South Australia: morphology, scleritome reconstruction, and phylogeny

67%

Skovsted C. B., Balthasar U., Brock G. A., Paterson J. R.

Acta Palaeontologica Polonica

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2009

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tom 54

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nr 3

525-540

The tommotiid Camenella reticulosa is redescribed based on new collections of well preserved sclerites from the Arrowie Basin (Flinders Ranges), South Australia, revealing new information concerning morphology and microstructure. The acutely pyramidal mitral sclerite is described for the first time and the sellate sclerite is shown to be coiled through up to 1.5 whorls. Based on Camenella, a model is proposed by which tommotiid sclerites are composed of alternating dense phosphatic, and presumably originally organic−rich, laminae. Camenella is morphologically most similar to Lapworthella, Kennardia, and Dailyatia, and these taxa are interpreted to represent a monophyletic clade, here termed the “camenellans”, within the Tommotiida. Potential reconstructions of the scleritome of Camenella are discussed and although a tubular scleritome construction was recently demonstrated for the tommotiids Eccentrotheca and Paterimitra, a bilaterally symmetrical scleritome model with the sclerites arranged symmetrically on the dorsal surface of a vagrant animal can not be ruled out.

6

The integument of Cambrian chancelloriids

67%

Bengtson S., Hou X.

Acta Palaeontologica Polonica

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2001

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tom 46

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nr 1

Details of the body surface of the chancelloriid Allonnia from the Lower Cambrian Chengjiang biota in southwestern China elucidate the nature of these enigmatic organisms. Rhombically arranged elements, about 30 x 60 ym, are interpreted as representing imbricating platelets, the distal ends of which projected as spinules from the body surface. Comparisons with other chancelloriids suggest that the flexible integument was continuous with the aragonitic sclerites that sit on the surface like cactus spines, and that both were formed by an epidermal epithelium secreting a continuous exo- and endocuticle. In the sclerites, the exocuticle was mineralized; the unmineralized endocuticle and cellular extensions from the epithelium filled the interior of the sclerites. In the flexible integument the epithelium was overlain by endocuticle and unmineralized exocuticle. This structure of soft integument and sclerites is at variance with proposals of poriferan or ascidian affinity of chancelloriids but in accord with a coeloscleritophoran model.

7

Upper Jurassic and Lower Cretaceous sclerites from the Lodz trough of the South-Eastern Slope of the Kujawy Swell

67%

Sztejn J.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1993

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tom 41

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nr 2

Ograniczanie wyników

3 Acta Palaeontologica Polonica

3 Bulletin of the Polish Academy of Sciences. Earth Sciences

1 Acta Parasitologica

2 Sztejn J.

1 Balthasar U.

1 Bengtson S.

1 Brock G. A.

1 Gerasev P.

1 Gorka H.

1 Hogstrom A. E. S.

1 Hou X.

1 Larsson C. M.

1 Paterson J. R.

1 Peel J. S.

1 Petrov A. A.

1 Skovsted C. B.

1 2019

2 2009

1 2001

1 1997

1 1995

1 1993

The spicules of sponges from Lower Cretaceous of the Polish lowlands

Muscular arrangement and sclerite morphology in the haptor of Tetraonchus monenteron (Monogenea, Dactylogyridea)

Holothurian sclerites from the Miocene deposits of the Gliwice Area [Upper Silesia, Poland]

Trachyplax arctica, a new multiplated problematic fossil from the Lower Cambrian of North Greenland

The tommotiid Camenella reticulosa from the Early Cambrian of South Australia: morphology, scleritome reconstruction, and phylogeny

The integument of Cambrian chancelloriids

Upper Jurassic and Lower Cretaceous sclerites from the Lodz trough of the South-Eastern Slope of the Kujawy Swell