... known from the Permian and, as such, informs the paleoecological setting in which the earliest crown group echinoids lived. This new fauna indicates that crown group echinoids occupied the same environments as stem group echinoids of the Archaeocidaridae and Proterocidaridae. Furthermore, the echinoids...

.... Class ECHINOIDEA Leske 1778 Family ARCHAEOCIDARIDAE M’Coy 1844 Genus LEPIDOCIDARIS Meek & Worthen 1873 Type species. Eocidaris ? squamosa Meek & Worthen 1869 , in Meek & Worthen (1873 , p. 478) by original designation and monotypy ( Fell 1966 , p. U319; Smith...

.... Peristome, perignathic girdle, and lantern unknown. Class Echinoidea Leske, 1778 Family Archaeocidaridae M’Coy, 1844 Genus Archaeocidaris M’Coy, 1844 Copyright © 2016, The Paleontological Society 2016 The Paleontological Society. All rights reserved Although their fossil...

... on the Clitheroe Limestone Formation ( Riley 1990 ). All specimens are deposited in the Naturalis Biodiversity Center, Leiden (prefix RGM). Class Echinoidea   Leske, 1778 Family Archaeocidaridae   M'Coy, 1844 archaeocidarid ? gen. et sp. indet. ( Fig. 1 )   Material. A single...

... ); however, this heightened Carboniferous diversity has its roots in the Devonian period. The Palaechinidae, Archaeocidaridae, Proterocidaridae and Lepidesthidae, which constitute the most diverse families of echinoids in the Carboniferous period, and indeed the entire Late Palaeozoic, are all first known...

..., disarticulated tests, we consider that such a comprehensive diagnosis provides necessary detail that might not be required of, for example, a Chalk spatangoid. Family Archaeocidaridae M'Coy, 1844 Genus Archaeocidaris M'Coy, 1844 Type species . Cidaris urii Fleming, 1828 , p. 478...

... slightly modified from Smith (1984 , table 7.1). Order Cidaroidea Claus, 1880 Family Archaeocidaridae McCoy, 1849 Genus Archaeocidaris McCoy, 1844 Figure 5 —Department of Geological Sciences slab 1967TX101, unsmoked, occupying about one-third square meter, and containing 20...