Cladistic analysis (Smith 2001) suggests that cassiduloids are a grade taxon comprising a small number of clades leading to the Clypeasteroida. The majority of Jurassic cassiduloids belong to the ...

During that time, countless fossils have been unearthed, but it wasn’t until this past April that a discovery of a rare ‘Lazarus Taxon’ – two carpoid fossils – made a singular impact ...

Pore-pairs simple and undifferentiated in all but one taxon; no differentiated perioral spines and tubercles; basicoronal interambulacral plate short, undifferentiated; tuberculation uniform and ...

WYNDD uses a standardized ranking system coordinated by NatureServe to indicate the probability of extirpation, at both the global and state scales, of each plant and animal taxon. The following ...