Khairkhaniidae

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Khairkhaniidae is an extinct family of Paleozoic molluscs with uncertain classification. They are thought to be related to either Gastropoda (snails) or Monoplacophora. Members have planispiral, tightly coiled shells with a columnar microstructure. In Bouchet & Rocroi’s 2005 taxonomy, Khairkhaniidae is placed among Paleozoic molluscs of uncertain systematic position and is not assigned to any superfamily. The family has no subfamilies. Some researchers, such as P. Yu. Parkhaev, consider Khairkhaniidae the only family in the order Khairkhaniifomes within the subclass Divasibranchia. The genera within the family are not listed here.