Rhenonema
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| Rhenonema Temporal range: Givetian
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| R. eifeliense | |
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| Genus: | Rhenonema Obruchev, 1964
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| Species: | R. eifeliense
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| Binomial name | |
| Rhenonema eifeliense (Kayser, 1880)
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Rhenonema eifeliense ("Rheinland thread of Eifel") is a large, extinct, high-crested holonematid arthrodire placoderm from Givetian-aged strata of Middle Devonian Gerolstein, Germany. It is known from some fragments of armor, including an anterior-lateral plate estimated to be around 24 centimetres (9.4 in) long, and a portion of a median dorsal plate with a very tall crest running along the median line of the dorsal surface. The ornamentation is very similar to that of Holonema , but the concentrically arranged ridges are much coarser in Rhenonema. The holotype was originally described by Kayser, in 1880, as a species of Dinichthys , but was then redescribed in 1964 by Obruchev as a holonematid.[2]
References
[edit ]- '^ Denison, Robert (1978). Placodermi Volume 2 of Handbook of Paleoichthyology. Stuttgart New York: Gustav Fischer Verlag. p. 87. ISBN 978-0-89574-027-4.
- '^ Denison, Robert (1978). Placodermi Volume 2 of Handbook of Paleoichthyology. Stuttgart New York: Gustav Fischer Verlag. pp. 63, 65. ISBN 978-0-89574-027-4.
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