Mitrocystitida

Belongs within: Ankyroida. Mitrocystitida was identified by Parsley (1997) as a paraphyletic group with the Anomalocystitida and Lagynocystis nested within it. Members of this clade mostly have moderately to only slightly asymmetrical thecae (Ubaghs 1967). <==Mitrocystitida [Mitrocystida] | i. s.: Spermacystis Ubaghs 1967 [=Anomocystis Jaekel 1918 non Haeckel 1896]U67 | `–*S. ensifer (Barrande 1887) [=Anomalocystites… Continue reading Mitrocystitida

Published
Categorised as Stylophora

Ankyroida

Belongs within: Stylophora.Contains: Mitrocystitida. The Ankyroida is a proposed clade of stylophoran echinoderms that combines the mitrates with various taxa previously included in the Cornuta. Ankyroids tend to have more symmetrical thecae than other stylophorans. In basal taxa, the theca bears a tesselate arrangement of small plates like that in non-ankyroid stylophorans; in derived taxa,… Continue reading Ankyroida

Published
Categorised as Stylophora

Stylophora

Belongs within: Echinodermata.Contains: Ankyroida. Conversations with Cothurnocystis Published 14 May 2008 I first encountered the Cothurnocystis whilst wandering through the Ordovician of the mid-1910s. I had been feeling rather peckish, as it was then Tuesday, so I was collecting brachiopods from the sea floor. I had been assured by an assistant of mine that a collection… Continue reading Stylophora