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Multicostella platys
Taxonomy
Orthis platys was named by Billings (1859). Its type specimen is G.S.C. 1034, a shell, and it is a 3D body fossil.
It was recombined as Dinorthis platys by Schuchert (1897); it was recombined as Plaesiomys platys by Raymond (1911); it was recombined as Multicostella platys by Cooper (1956).
It was recombined as Dinorthis platys by Schuchert (1897); it was recombined as Plaesiomys platys by Raymond (1911); it was recombined as Multicostella platys by Cooper (1956).
Sister species lacking formal opinion data
Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Multicostella platys Billings 1859
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Diagnosis
Reference | Diagnosis | |
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G. A. Cooper 1956 | Like all species of Multicostella this one is also very variable in size and certain of the details of the surface. The type specimen (G.S.C. 1034) which is preserved in the Geological Survey of Canada collection is a fairly large specimen but is poorly preserved. Much of the exterior has been stripped from the shell, making it impossible to determine the details of the costellae exactly. The convexity of both valves is low and at the front of the pedicle valve the specimen is depressed to form a broad and shallow sulcus. The sulcus of the brachial valve is shallow and narrow and extends about to the middle of the valve. At the front of the brachial valve a low swelling corresponds to the sulcus of the pedicle valve. Some specimens show a clearly defined sulcus in the brachial valve extending from the beak to the anterior margin. Ten costellae may be counted in a distance of 5 mm. at the front margin of the holotype. Inasmuch as this specimen is much exfoliated, it is possible that the finest costellae of the latest generation are lost and cannot be counted. The holotype is 18.5 mm. long, 21 mm. wide, and 5.5 mm. thick. Specimens preserving the exterior show the costellae to be narrow, elevated, and bundled with ones of various sizes in several generations. |
Measurements
No measurements are available
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Source: g = genus, f = family, c = class, p = phylum, uc = unranked clade | |||||
References: Hendy et al. 2009, Nesnidal et al. 2013, Aberhan et al. 2004, Hendy 2009 |
Collections (73 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Chazyan | USA (New York) | Plaesiomys platys (42808 56184 56185 171708 171711 172144 172180 172184 172227 172228 172230 172231 172232 172233 172234 172236 172238 172240 172294 172295 172296 172307 172308 172309 172310 172311 172312 172313 172316 172317 172319 172321 172323 172324 172325 172326 172327 172328 172329 172330 172336 172346 172347 172348 172349) | |
Chazyan | Canada (Ontario) | Plaesiomys platys (172204 172358) | |
Chazyan | Canada (Quebec) | Multicostella platys (80006) Plaesiomys platys (172209 172350 172352 172353) | |
Chazyan | USA (Tennessee) | Plaesiomys platys (219793) | |
Caradoc | USA (Virginia) | Multicostella platys (34007 34028 34029 34030 34031 34032 34152 34153 34167 34168 34169) | |
Ashbyan | USA (Virginia) | Multicostella platys (33938 33980 33981 33982 33983 33984 33995 33996 33997) |