Subphylum
Echinozoa Zittel, 1895
Selection of related publications
Thompson, J. R., Cotton, L. J., Candela, Y., Kutscher, M., Reich, M., Bottjer, D. J. 2022. The Ordovician diversification of sea urchins: systematics of the Bothriocidaroida (Echinodermata: Echinoidea).  Journal of Systematic Palaeontology   19,   20,   1395-1448. DOI:10.1080/14772019.2022.2042408
Bockelie, J. F., Briskeby, P. I. 1980. The presence of a bothriocidarid (Echinoid) in the Ordovician of Norway.  Norsk Geologisk Tidsskrift   60,      89-91.
Schallreuter,  R. 1975. Ein neuer ordovizischer Holothuriensklerit aus Öjlemyrgeschieben der Insel Gotland.  Neues Jahrbuch für Geologie und Paläontologie Monatshefte   1975,   12,   727-733.
Reif, W.-E. 1968. Schwammreste aus dem oberen Ordovizium von Estland und Schweden.  Neues Jahrbuch für Geologie und Paläontologie Monatshefte   12,      733-744.
Männil, R. M. 1962. The taxonomy and morphology of Bothriocidaris (Echinoidea).  ENSV TA Geoloogia Instituudi Uurimused   IX,      143-181.
Regnéll, G. 1956. Silurian Echinoids from Gotland.  Arkiv för kemi, mineralogi och geologi   2,      155-178.
Mortensen, T. 1930. Bothriocidaris and the Ancestry of Echinoids.  Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kjobenhavn   90,      313-352.
Klem, M. J. 1904. A Revision of the Palaeozoic Palaeechinoidea, with a Synopsis of All Known Species.  Transactions of the Academy of Science of Saint Louis   14,   1,   1-98.
Eichwald, E. 1860. Lethaea Rossica ou Paléontologie de la Russie. Premier volume. Ancienne Période en deux sections. pp. XIX+1–1657.  E. Schweizerbart.  DOI:10.5962/bhl.title.52391
List of species
1. Bothriocidaris eichwaldi Männil, 1962 | Pirgu Stage
2. Bothriocidaris exilis (Eichwald, 1854) | Silurian
3. Bothriocidaris globulus Eichwald, 1860 | Pirgu Stage
4. Bothriocidaris pahleni Schmidt, 1874 | Jõhvi Substage
5. Bothriocidaris parvus Männil, 1962 | Vormsi Stage
6. Gotlandechinus balticus Regnéll, 1956 | Ludlow
7. Lanternarius latens Regnéll, 1956 | Wenlock
10. Neobothriocidaris peculiaris Paul, 1967 | Ordovician
11. Silurocidaris clavata Regnéll, 1956 | Ludlow
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Echinodermata | 
| Subphylum | Asterozoa | 
| Blastozoa | |
| Echinozoa | |
| Class | Echinoidea | 
| Holothuroidea | |
| Subphylum | Eleutherozoa | 
| Pelmatozoa | |
| Class | Crinoidea | 
| Cyclocystoidea | |
| Homoiostelea | |
| Stylophora |