Kallosphaeridium helbyi subsp. helbyi
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subsp. helbyi. Autonym. Holotype: Cookson and Hughes, 1964, pl.8, fig.1. Originally Canningia? minor subsp. minor, subsequently Chytroeisphaeridia minor subsp. minor, thirdly (and now) Kallosphaeridium? helbyi subsp. helbyi. Age: late Albian–early Cenomanian.
Parent: Kallosphaeridium helbyi