Order
Trachelocrinida Sumrall, Sprinkle et Guensburg, 1997
Selection of related publications
Kõrts, A. 1989. Brachiolar plates of Bockia (Eocrinoidea) from the Middle Ordovician of Estonia and Leningrad Region.Fossil and Recent Echinoderm researches , pp. 34-37. Academy of Sciences of the Estonian SSR Institute of Geology.
Bockelie, J. F. 1981. The Middle Ordovician of the Oslo Region, Norway: 30. The eocrinoid genera Cryptocrinites, Rhipidocystis and Bockia. Norsk Geologisk Tidsskrift 61, 2, 123-147.
Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I. pp. 1-346. Valgus.
Hecker, R. F. 1940. Nižnesilurijskie i devonskie iglokožie. Carpoidea, Eocrinoidea i Ophiocistia nižnego silura Leningradskoj oblasti i Èstonii. Transactions of the Paleontological Institute (PIN) 9, 4, 5-82.
Hecker, R. F. 1938. New data on Rhipidocystis Jkl (Oder Digitata n. o., class Carpoidea Jkl) and on a new Genus Bockia (subclass Eocrinoidea Jkl, class Crinoidea Mill.) from the Ordovician of Leningrad province, USSR, and Estonia. Doklady Akademii Nauk SSSR 19, 5, 421-425.
List of species
1. Heckerocrinus cucumis (Hecker, 1938) | Idavere Substage
2. Heckerocrinus grava (Bockelie, 1981) | Ordovician
3. Heckerocrinus heintzi (Bockelie, 1981) | Darriwilian
5. Heckerocrinus mirabilis (Bockelie, 1981) | Lower Ordovician
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Echinodermata |
| Subphylum | Blastozoa |
| Class | Eocrinoidea |
| Order | Digitata |
| Simonkovicrinida | |
| Trachelocrinida | |
| Family | Heckerocrinidae |
| Bolboporitidae | |
| Cryptocrinitidae | |
| Genus | Gadovocrinus |
| Polyptychella |