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Showing results for tags 'cidarian'.
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I found this fossil sea urchin in Ithaca, NY in a layer of Moscow Shale (~400 MYO). I'm trying to figure out exactly what this is, and I think it might be an archaeocidaroid. The earliest published cidaroid is ~260 MYO (J.R. Thompson, et.al. Scientific Reports, 2015). I don't think this one is a euechinoid but i suppose it could be. Any feedback would be appreciated.
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- archaeocidaris
- cidarian
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Almucidaris is a very unusual cidarian genus due to its enlarged plates that form marsupia for breeding. North American paleontologists Blake and Zinsmeister erected the genus in 1991 and described Almucidaris durhami as the type species here. Until now, only two species have been found showing marsupia. In 1933, Lambert first described the species (without marsupia) as Typocidaris falgarsensis here (in French). As the holotype designated by Lambert was lost in the Spanish Civil War in 1997, J. F. Carrasco designated a neotype (also without marsupia) and renamed the species as Temnocidaris (Stereocidaris) falgarsensis here (in Spanish). Finally, A. B. Smith and C. H. Jeffery included the species falgarsensis in the genus Almucidaris in this 2000 paper: Maastrichtian and palaeocene echinoids: a key to world faunas. Special papers in palaentology; 63. p. 30-31. (This paper is not free access, so I can't link it)
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- cidarian
- late campanian
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