Updated About encyclopedia.com content Print Article
Bothriocidaroida (phylum Echinodermata, class Echinoidea) Small order of echinoderms which have five double columns of perforate plates and five columns of single imperforate plates. Traditionally they were regarded as the ancestral stock of all echinoids, but this is now considered unlikely. There are only three genera, Bothriocidaris (the earliest echinoid), Neobothriocidaris, and Unibothriocidaris, ranging in age from Middle Ordovician to Upper Silurian.
More From encyclopedia.com
Stock , stock / stäk/ • n. 1. the goods or merchandise kept on the premises of a business or warehouse and available for sale or distribution. ∎ a supply or… Coccolithophorids , coccolithophorids (phylum Prymnesiophyta) A group of unicellular, marine, planktonic algae which are, at least at some stage in their life cycle, cov… Stock (botany) , stock A. trunk, stem OE.; B. supporting structure; frame of timber for punishment XIV; C. hollow receptacle XIV; D. massive portion of an instrument… Hybridization , Hybridization is a technique in which molecules of single-stranded deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) are bound to complementary s… Thecodontia , Thecodontia (thecodonts) ‘Tooth-in-socket’ reptiles, and the most primitive order of the Archosauria (‘ruling reptiles’), ranging from the Upper Perm… Double Entendre , double entendre •airer, bearer, carer, Clara, darer, declarer, Demerara, Éire, habanera, Halmahera, parer, Perak, primavera, repairer, Rivera, Rivier…
You Might Also Like