Cidaroida,[1] also known as pencil urchins,[2] is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
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Cidaroida, also known as pencil urchins, is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders...
regions of the Atlantic Ocean. As a member of the basal echinoid order Cidaroida, its morphological, developmental and molecular genetic characteristics...
(plant), a plant genus in the Linaceae family Radiola, the spines of fossil Cidaroida sea urchins Radiola, a 1920s line of radios by RCA Radiola, a brand name...
euechinoid sea urchins became common. Today, only a single order, the Cidaroida, survives. Most fossil forms had multiple columns of ambulacral plates...
1–180. Accessed 2019-02-06. B. M. Cutress. 1980. Cretaceous and Tertiary Cidaroida (Echinodermata: Echinoidea) of the Caribbean Area. Bulletins of American...
Sri Lanka is a tropical island situated close to the southern tip of India. The invertebrate fauna is as large as it is common to other regions of the...
Cidaridae is a family of sea urchins in the order Cidaroida. Cidarid sea urchins are characterized by their stout skeleton : the test is thick and hard...
Psychocidaridae is a family of sea urchins in the order Cidaroida. The genus Psychocidaris is extant while the other genera are only known from fossils...
Clypeasteroida Echinolampas depressa, an Echinolampadoida Eucidaris metularia, a Cidaroida Order Apodida Order Dendrochirotida Order Elasipodida Order Holothuriida...
1–180. Accessed 2019-02-06. B. M. Cutress. 1980. Cretaceous and Tertiary Cidaroida (Echinodermata: Echinoidea) of the Caribbean Area. Bulletins of American...
Ctenocidaridae is a family of echinoderms belonging to the order Cidaroida. Genera: Aporocidaris Agassiz & Clark, 1907 Ctenocidaris Mortensen, 1910 Homalocidaris...
The list of echinoderms of South Africa is a list of species that form a part of the echinoderm (Phylum Echinodermata) fauna of South Africa, and includes...
1–180. Accessed 2019-02-06. B. M. Cutress. 1980. Cretaceous and Tertiary Cidaroida (Echinodermata: Echinoidea) of the Caribbean Area. Bulletins of American...
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