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4 marzo 2015 3 04 /03 /marzo /2015 21:50

Parahelicoprion1DB.jpg

Parahelicoprion clerci - Early Permian (Artinskian) of Krasnoufimsk (Ural). Traditional reconstruction.

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El parahelicoprion era un carnívoro nectónico que apresaba de una gran variedad de especies con sus dientes como cuchillas para cortar carne expuestos como un hacha o una cuña. Se identificaron muchas especies de presas diferentes a principios del Pérmico, desde pescado sarcopterigianos mal equipados para hacer frente a grandes depredadores
(como el Menaspis y Petalodus entre las presas más comunes), tiburones xenacantidos, abundante variedad de amonites y trilobites, y debido a su tamaño, otros eugeneodontidos pequeños. al parecer, el parahelicoprion no tenía remilgos en canibalizar su propia especie. [4]

http://en.wikipedia.org/wiki/Parahelicoprion
Parahelicoprion was a nektonic carnivore that preyed upon a variety of different species, using its blade-like teeth to cut at exposed flesh like a hatchet or wedge. Many different prey species were identified at the beginning of the Permian, from sarcopterygian fish ill-equipped to deal with large predators
(Menaspis and Petalodus being common prey items), xenacanthid sharks, plentiful species of ammonite and trilobite, and due to its size, other smaller eugeneodontids. Parahelicoprion is even believed to participate in cannibalism of its own species. [4]

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Don’t worry Edestus, it’s not like I ever planned on going into the ocean ever again… PS: The book that this is from, Megalodon & Prehistoric Sharks from Zenescope, is kind of amazing and ridiculous and I’m sure you’ll be seeing more from it soon because Shark Week. 

Tiburón con trompa de dientes es un misterio: Helicoprion bessonovi.

 

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Helicoprion bessonovi1DB.jpg

Helicoprion bessonovi - edestid "shark" from Early Permian (Artinskian) of Ural region. Highly hypotetical reconstruction.

 

Helicoprion ferreri, alternative restoration of eugeneodontid "shark" with short rostrum

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Copacabana fish fauna - from Janvier, Early Vertebrates

Early Permian fishes from the Copacabana Formation of Bolivia. The fauna still includes some of the peculiar chondrichthyans of the Carboniferous, such as huge engeneodontids (1. Parahelicoprion) and petalodontids (2, Megactenopetalus) along with primitive sharks (3) and a variety of ray-finned fishes (4, platysomids).

http://palaeos.com/paleozoic/permian/cisuralian.html

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Los eugeneodontiformes es un orden extinto y mal conocido de extraños peces cartilaginosos. Poseían un singular órgano bucal espiral dentado en la sínfisis de la mandíbula inferior, así como aletas pectorales apuntaladas por las radiales largas. El palatocuadrado se fusionaba en el cráneo o se reducía. Ahora taxonómicamente englobados dentro de los Holocephalidos, sus parientes vivos más cercanos son las quimera. [2] El significado del nombre Eugeneodonto se correlaciona con "dientes de origen verdadero", y viene de las palabras griegas eu (verdadero), geneos (raza, clase, origen) y odon (diente).

Los miembros del orden Eugeneodontiformes se clasifican en diferentes familias, los mejor conservados descubierto son colocados comúnmente dentro de las familias Agassizodontidae ("Dientes de Louis Agassiz"), y Edestidae ("Aquellos que devoran"); conteniendo los primeros los géneros Helicoprion, Sarcoprion y Parahelicoprion, y los segundos conteniendo los géneros Edestus, Listracanthus y Metaxyacanthus.
Se cree que todos los eugeneodontoss fueron carnívoros obligados, con comportamientos de alimentación especializados según género, rangos de territorio y presas específicas.

http://en.wikipedia.org/wiki/Eugeneodontida

Eugeneodontida is an extinct and poorly known order of bizarre cartilaginous fishes. They possessed a unique "tooth-whorl" on the symphysis of the lower jaw as well as pectoral fins supported by long radials. The palatoquadrate was either fused to the skull or reduced. Now determined to be within Holocephali, their closest living relatives are ratfish.[2] The meaning of the name Eugeneodont correlates to "true origin teeth", and comes from the Greek words eu (good/true), geneos (race, kind, origin) and odon (tooth.)

Members of Eugeneodontida are further classified into different families, the most well-preserved members that have been discovered are commonly placed within the families Agassizodontidae ("Teeth of Louis Agassiz"), and Edestidae ("Those which Devour"), the former containing the genera Helicoprion, Sarcoprion and Parahelicoprion, and the latter containing the genera Edestus, Listracanthus and Metaxyacanthus. All Eugeneodonts are thought to be obligate carnivores, with each genera having specialized feeding behaviors, territory ranges and specific prey.

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Helicoprion Reconstruction by Spiralfish

http://www.deviantart.com/

The mysterious "Spiral Saw Shark," Helicoprion bessonovi, of Early Permian Russia. Its discoverer, one Andrzej P. Karpinski, spent 70 + years of his life trying to figure out, in vain I might add, about what Helicoprion looked like alive. The skull of its relative, Ornithoprion helped bushels, though it was discovered after Dr Karpinski when kaput. Here, one H. bessonovi is about to feast on a school of Acanthonautilus cornutus.
It may be easy to dismiss Helicoprion as a "mistake of evolution," but, please do remember that this genus was among the 5 to 10 percent of marine species that survived the Permian-Triassic Extinction Event. They died out during the early Triassic

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TAXONOMIA DE LOS EUGENEODÓNTIDOS

 

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Helicoprion nevadensis by avancna

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Helicoprion nevadensis, and a pair of Edestus giganteus prey on some acanthodians. Both Helicoprion and Edestus arose during the early Carboniferous. Helicoprion survived the Permian-Triassic extinction, and went extinct some time during the Triassic. Edestus did not.

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http://en.wikipedia.org/wiki/Eugeneodontida

http://lj.rossia.org/community/paleobio_ljr/66552.html?mode=reply

http://users.atw.hu/fishindex/chondrichthyes/elasmobranchii/eugeneodontiformes.htm

http://lj.rossia.org/community/paleobio_ljr/2011/10/01/

http://frenchsharkteeth.over-blog.com/article-smam-2011-trilobites-102452322.html

bourse aux fossiles & mineraux de sainte marie aux mines

 

ctenaca3.jpg (32094 bytes)

Site 2 - Geary County #1 - This is the second of Keith's Permian shark sites, somewhat higher in the section than Site 1. Keith has found a number of Ctenacanthus spines at this site, two of which occurred next to a Cladodus tooth (probably more of a coincidence than an association). While spines are plentiful, teeth are rare.

 

http://oceansofkansas.com/paleozoic.html

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  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL
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