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| Graptolite Net | Graptolites and Graptoliters | Evolution of Graptolites | Tuboidea | Crustoidea | Camaroidea | Rhabdopleuroidea |Cephalodiscoidea |
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| ________________________________________________________________________________ Graptolite Net is edited by Piotr Mierzejewski, the Count of Calmont and Countess Maja Anna Korwin-Kossakowska since 2002 |
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| CHLOROPHYCEAE - Green algae |
| Genus Medusaegraptus Ruedemann, 1925 not a graptolite, but a codiacean or dasycladacean alga |
| In 1925, Ruedemann established the genus Medusaegraptus with two species (both from the Silurian of North America): M. mirabilis Ruedemann (type species) and M. graminiformis (Pohlman, 1886) Ruedemann, 1925. Original diagnosis: " Rhabdosome consisting of a simple, nit branching stipe, which is a uniformly thick tube, ending in a blunt point at the base and terminating distally in a dense mass of simple, unbranched flexuosus thin tubes, the thecae" (Ruedemann 1925, p. 29). Boucek (1957) interpreted Medusaegraptus as a graptolite of the order Inocaulida, whereas Bulman (1955, 1970) suggested the algal nature of this fossil. Mierzejewski (1986) considered it be a codiacean alga (Codiaceae), but Lo Duca (1990) assigned it to dasycladacean algae (Dasycladaceae). |
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| LIST OF SPECIES: M. crinitus Boucek, 1957 - Silurian (upper Wenlock) of Bohemia M. divaricatus Lin Yao-kun - Middle Ordovician of China M. floralis Lin Yao-kun, 1984 - Middle Ordovician of China M. graminiformis Ruedemann, 1925 - Silurian of North America M. hispidus Lin Yao-kun, 1984 - MiddleOrdovician of China M. mirabilis Ruedemann, 1925 - Silurian of North America M. pavonicus Lin Yao-kun, 1984 - Middle Ordovician of China M.? plumosus Lin Yao-kun, 1984 - Middle Ordovician of China M. setaceus Lin Yao-kun, 1984 - Middle Ordovician of China M. similis Boucek, 1957 - Silurian (upper Wenlock) of Bohemia M.? wilsoni Ruedemann, 1942 - Middle Ordovician of North America ___________________________ See also: Medusaegraptus from the Silurian of Gotland |
| Holotype of Meduseagraptus mirabilis Silurian, North America |