Although only one fossil taxon can be assigned to this genus Micropygidae presumably have a long cryptic history. There is a possibility that the Late Jurassic Pedinothuria represents an early member of this clade. Like Micropyga and Kierechinus it has very deep and sharp buccal notches and biserially arranged pore-pairs. However, its pattern of plate compounding is different and it has just a single large primary tubercle on each interambulacral plate that is strongly crenulate. For the present it is left as incertae sedis. |
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