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Glyptocystida (Glyptocystids)

      Order Glyptocystitida and especially its group Rhombifera are a small but successful group of derived blastozoan echinoderms that originated during the Late Cambrian (Ubaghs, 1999), were prominent in the fossil record by the end of the Early Ordovician, and had a peak in diversity during the Middle Ordovician (Sprinkle et al., 1996). On the whole the clade is extremely conservative, having a thecal plating formula that remained generally unchanged throughout its history, until its extinction by the early Late Devonian.

On/line reference: Broadhead a Sumrall (2003).
Rhombifera bohemica Barrande MŠ1813
Rhombifera bohemica Barrandefoto MŠ1819
Rhombifera bohemica Barrande p1669
Rhombifera bohemica Barrande XB812
Rhombifera bohemica Barrande p1667
Rhombifera bohemica Barrandefoto XB803
Rhombifera bohemica Barrande BL93
Rhombifera bohemica Barrande p1668
Rhombifera bohemica Barrande KP886
Rhombifera bohemica BarrandeFatka et al. 2022, Fig 8.B. BL198
Rhombifera bohemica Barrandefoto XB596
Rhombifera bohemica Barrande KP922
Rhombifera bohemica Barrande BL90
Rhombifera bohemica Barrande p4926

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]