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Alkaidia is an extinct genus of sea stars which lived in the western Tethys Ocean from the Barremian to Cenomanian stages of the Cretaceous period. It was first described in 1998, and two species are currently assigned to it. The type species, A. sumralli, is known from both complete and fragmentary specimens collected in Texas, and fossils of an earlier species, A. megaungula, have been found in Morocco.
References
- ↑ Colin D. Sumrall; Susana Heredia; Cecilia M. Rodríguez & Ana I. Mestre (2012). "The first report of South American edrioasteroids and the paleoecology and ontogeny of rhenopyrgid echinoderms" (PDF). Acta Palaeontologica Polonica. in press. doi: 10.4202/app.2011.0108 .
- 1 2 Ewin, Timothy A. M.; Martin, Markus; Isotalo, Phillip; Zamora, Samuel (2020). "New rhenopyrgid edrioasteroids (Echinodermata) and their implications for taxonomy, functional morphology, and paleoecology". Journal of Paleontology. 94 (1): 115–130. Bibcode:2020JPal...94..115E. doi:10.1017/jpa.2019.65. ISSN 0022-3360. S2CID 204263950.
- ↑ "Unusual fossil worms surprise scientists". www.nhm.ac.uk. Retrieved 2019-12-31.