The oldest reported occurrence of cryptospores supposed to derive from land plants (embryophytes) is currently considered be in the Middle Ordovician. two genera Virgatasporites and Attritasporites, described 1960ʹs Early Ordovician (Tremadocian) Algeria, are morphologically close miospores, therefore pose a dilemma, because these spore-like microfossils recorded before first appearance plant d...

The many Early Ordovician crinoid discoveries over the past 30 years signal a largely undocumented radiation. new diversity totals more than five times previous known list as of year 2000. Camerate, cladid, and disparid clades had emerged by second half Tremadocian Series, early during this time. Many key features such their distinctive arms standard cup plating originated end Ordovician, Floia...