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Romundina is a small, heavily armored exti … Romundina is a small, heavily armored extinct genus of acanthothoracid placoderms which lived in shallow marine environments in the early Devonian (Lochkovian). The name Romundina honors Canadian geologist and paleontologist Dr. Rómundur (Raymond) Thorsteinsson of Calgary, Alberta, Canada. Romundina are believed to have lived on Earth between 400 and 419 million years ago. The closest known relative to Romundina is the acanthothoracid Radotina. The type and only described species is R. stellina. The first specimen of Romundina was originally discovered by Swedish paleontologist Tor Ørvig in 1975 on Prince of Wales Island (Nunavut) in a formation that geologically dates back to the Gedinnian. Only one known species of Romundina has been discovered which was named Romundina stellina by Ørvig. The species name stellina refers to stellate (derived from Latin word stella meaning star) tubercles that the Placoderm has ornamenting its dermal skeleton. Romundina stellina is one of the earliest known acanthothoraciforms discovered to date. Recently, Romundina stellina has been heavily researched as it shows signs of having extremely primitive teeth, which structurally share characteristics of both dermal tubercles and the teeth of modern and fossil gnathostomes. Although Romundina are known to be relatively small especially when compared to some large predatory placoderms of the time, it is still thought to be carnivorous due to the tooth-like structures on its gnathal and supragnathal plates. Romundina shares many characteristics of both cyclostomes and Gnathostomes to varying degrees. This reinforces the hypothesis that placoderms are a grade as they have some features more closely related to cyclostomes then other placoderms while other features are much more closely related to crown group Gnathostomes.osely related to crown group Gnathostomes.
, Romundina est un genre éteint de placoderm … Romundina est un genre éteint de placodermes, ayant vécu au Lochkovien, premier étage géologique du Dévonien inférieur, il y a environ entre 419 et 411 Ma (millions d'années) dans l'actuel archipel arctique canadien. Le genre a été décrit en 1975 par le paléontologue suédois (d) et nommé en l'honneur du géologue canadien Raymond Thorsteinsson. Une seule espèce est connue, Romundina stellina.ule espèce est connue, Romundina stellina.
, Romundina stellina es una especie extinta … Romundina stellina es una especie extinta de placodermo de la familia que vivió durante el Devónico Inferior en Canadá. Un análisis filogenético y morfológico realizado por Dupret et al. (2014) sugiere que está relacionado con miembros basales del clado Arthrodira.on miembros basales del clado Arthrodira.
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| rdfs:comment |
Romundina stellina es una especie extinta … Romundina stellina es una especie extinta de placodermo de la familia que vivió durante el Devónico Inferior en Canadá. Un análisis filogenético y morfológico realizado por Dupret et al. (2014) sugiere que está relacionado con miembros basales del clado Arthrodira.on miembros basales del clado Arthrodira.
, Romundina is a small, heavily armored exti … Romundina is a small, heavily armored extinct genus of acanthothoracid placoderms which lived in shallow marine environments in the early Devonian (Lochkovian). The name Romundina honors Canadian geologist and paleontologist Dr. Rómundur (Raymond) Thorsteinsson of Calgary, Alberta, Canada. Romundina are believed to have lived on Earth between 400 and 419 million years ago. The closest known relative to Romundina is the acanthothoracid Radotina. The type and only described species is R. stellina.and only described species is R. stellina.
, Romundina est un genre éteint de placoderm … Romundina est un genre éteint de placodermes, ayant vécu au Lochkovien, premier étage géologique du Dévonien inférieur, il y a environ entre 419 et 411 Ma (millions d'années) dans l'actuel archipel arctique canadien. Le genre a été décrit en 1975 par le paléontologue suédois (d) et nommé en l'honneur du géologue canadien Raymond Thorsteinsson. Une seule espèce est connue, Romundina stellina.ule espèce est connue, Romundina stellina.
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Romundina
, Romundina stellina
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