Wikipedia:Pagipadasan: Paggiddiatan a nagbaetan dagiti rebision

The '''slate pencil urchin''', ''Eucidaris tribuloides'', is a cidaroid [[sea urchin]] that inhabits [[littoral]] and sub-littoral regions of the [[Atlantic Ocean]]. As a member of the [[basal clade|basal echinoid class]] Cidaroida, its morphological, developmental and molecular genetic characteristics make it a phylogenetically interesting species.<ref>{{cite tojournal s|author=Schroeder, TE |title="Development of a 'primitive' sea urchin ([[[Eucidaris tribuloides]]]): irregularities in the hyaline layer, micromeres, and primary mesenchyme" |journal=Biol. Bull. |volume=161 |year=1981 |pages=141-151}}</ref>