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Rayonnoceras est un genre éteint de céphalopodes qui vivaient il y a environ 325 millions d'années au Carbonifère. Bien qu'ils ressemblent à des antérieurs, ils appartiennent maintenant aux .
, Rayonnoceras is een uitgestorven geslacht van mollusken, dat leefde tijdens het Vroeg-Carboon.
, 瑞諾角石（學名：Rayonnoceras），又名雷用諾角石，是一屬已滅絕的鸚鵡螺類。牠們生活在淺海環境中。雖然牠們類似早期的物種，但現在已被歸類於之下。
, Rayonnoceras is a genus of extinct cephalo … Rayonnoceras is a genus of extinct cephalopods that lived around 325 million years ago during the Carboniferous. Although they resemble earlier actinocerids they are now though to belong to the Pseudorthocerida Rayonnoceras is characterized by large straight shells with a large subcentral siphuncle composed of subglobular segments, as for the family. The endosiphuncular canal system is well developed and most chambers are filled with organic deposits. Some shells have transverse striae, others are smooth. As with earlier actinocerids, Rayonnoceras has a canal system within the siphuncle that includes a narrow opening, the parispatium, between the internal deposits and inner wall of the connecting ring. It differs from the earlier actinocerids in having a bullet-like apex with a cicatrix and a long first chamber, characteristic of pseuorthocerids, rather than a blunt apex and short first chamber characteristic of true actinocerids. Orientation during life was horizontal. Cameral deposits, more concentrated in the apical part of the shell, are thought to have acted as ballast that compensated for the weight of the animal in the forward part. In life Rayonnoceras was probably a bottom dweller that spent most of its time stationary, waiting in ambush for prey. Rayonnoceras was among the last of the actinocerid-mimics, which finally died out in the Carboniferous. In 2003 a specimen of Rayonnoceras solidiforme eight feet long (2.4m) was found in Arkansas. It is believed to be the largest of its kind ever found and is housed at the University of Arkansas Museum.used at the University of Arkansas Museum.
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Rayonnoceras est un genre éteint de céphalopodes qui vivaient il y a environ 325 millions d'années au Carbonifère. Bien qu'ils ressemblent à des antérieurs, ils appartiennent maintenant aux .
, Rayonnoceras is a genus of extinct cephalo … Rayonnoceras is a genus of extinct cephalopods that lived around 325 million years ago during the Carboniferous. Although they resemble earlier actinocerids they are now though to belong to the Pseudorthocerida Orientation during life was horizontal. Cameral deposits, more concentrated in the apical part of the shell, are thought to have acted as ballast that compensated for the weight of the animal in the forward part. In life Rayonnoceras was probably a bottom dweller that spent most of its time stationary, waiting in ambush for prey.me stationary, waiting in ambush for prey.
, 瑞諾角石（學名：Rayonnoceras），又名雷用諾角石，是一屬已滅絕的鸚鵡螺類。牠們生活在淺海環境中。雖然牠們類似早期的物種，但現在已被歸類於之下。
, Rayonnoceras is een uitgestorven geslacht van mollusken, dat leefde tijdens het Vroeg-Carboon.
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Rayonnoceras
, 瑞諾角石
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