||Clade of Echinacea with:
- apical disc relatively small; hemicyclic to dicyclic. Periproct subcircular with smooth rim;
- ambulacra trigeminate to polygeminate, with arbaciid style plate compounding; only one element in each compound plate expanded and extending from adradial to perradial suture and bearing primary tubercle; other elements are demiplates;
- Primary tubercles minute; those of ambulacral and interambulacral zones similar in size; generally perforate and often crenulate, but small size and poor preservation;
- Peristome relatively small; buccal notches distinct.
||Cretaceous, Europe, North America, Middle East, North Africa.
|Classification and/or Status
||Carinacea, stem group Echinacea,
||Closely resembling certain arbaciids but differing from them in having perforate and crenulate tubercles. Emiratiidae have perforate tubercles but differ in having a monocyclic apical disc, whose inner edge is notched by periproctal plates. Emiratiidae also differ in having simple diadematid plate compounding.