Echinosphaerites

Echinosphaerites – rombiferan tsistoid ignaterililar urugʻi boʻlib, ilk va oʻrta Ordovik davrlarida Shimoliy Amerika hamda Yevropa hududlarida yashagan (Bockelie, 1981)Bockelie, 1981..

 Manbalar 
 Bockelie, J. F., 1981. Functional morphology and evolution of the cystoid Echinosphaerites. Lethaia 14: 189–202.

 Havolalar 
 Echinosphaerites in the Paleobiology Database
 Functional morphology and evolution of the cystoid Echinosphaerites in the Wiley Online Library