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Showing results for tags 'palaeoxyris'.
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I am thinking that this is an example of Palaeoxyris prendelli, if it is, I believe it is my first of this specific one. @RCFossils @stats
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Just joint and wanted to get my first entry in. This middle Pennsylvanian concretion from Mazon Creek, was discovered in 2015 in pit 2, in an area I call Ivy Ridge thanks to all the Poison Ivy in the area. The finger near the top right should be where the shark emerged. I did not find this shark egg case variety posted. I hope this helps in future identification. Eventually I will be getting the measurement blocks. Shark Egg Case Phylum: Chordata Class: Chondrichthyes Palaeoxyris multiplicatum Horseshoe crab Phylum: Arthopoda Superclass: Chelicerata Class: Merostomata Order: Xiphosura Euproops danae
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From the album: Vertebrates
Palaeoxyris appendiculata Lesquereux, 1870 Middle Pennsylvanian Pit 11 Mazon Creek Illinois USA-
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From the album: Vertebrates
"Palaeoxyris corrugata" Lesquereux, 1870 Late Carboniferous Pennsylvanian Late Moskovian Illinois Mazon Creek USA-
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References: GRZEGORZ PACYNA and DANUTA ZDEBSKA (2012) Carboniferous plants preserved within sideritic nodules – a remarkable state of preservation providing a wealth of information. Acta Palaeobotanica 52(2): 247–269, 2012.
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Palaeoxyris is now thought to be the shark egg morphotype of the family Hybodontoidae. Quote from Fischer & Kogan (2008): "Based on the size differentiation and frequency of two Palaeoxyris species and different hybodont shark remains from the Stephanian lacustrine Wettin strata of the Saale Basin, Germany, SCHNEIDER (1986) was able to assign both egg capsules to their putative producers (P. helicteroides to Lissodus lacustris and P. carbonaria to Limnoselache [Sphenacanthus SOLER-GIJÓN, 1997] vicinalis; this attribution was confirmed by GEBHARDT, 1988) (Fig. 5), which occurred in the same strata but in different sedimentary facies. The capsules were mainly found in fluviatile-palustrine deposits, whereas skeletal remains were restricted to pelagic lacustrine sediments. So it seemed plausible that both hybodont shark species used the shore area of the lake for spawning." Lit.: Jan Fischer & Ilja Kogan (2008) Elasmobranch egg capsules Palaeoxyris, Fayolia and Vetacapsula as subject of palaeontological research – an annotated bibliography. Freiberger Forschungshefte, C 528, pp75-91
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- carboniferous
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The capsule has a complete length of about 20 cm. Lit.: Böttcher, Ronald (2010): Description of the shark egg capsule Palaeoxyris friessi n. sp. from the Ladinian (Middle Triassic) of SW Germany and discussion of all known egg capsules from the Triassic of the Germanic Basin. Palaeodiversity 3: 123–139; Stuttgart 30 December 2010 Jan Fischer & Ilja Kogan (2008) Elasmobranch egg capsules Palaeoxyris, Fayolia and Vetacapsula as subject of palaeontological research – an annotated bibliography. Freiberger Forschungshefte, C 528, pp75-91
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- bayreuth
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