†Isognomon (Hippochaeta) (oyster)

Bivalvia - Ostreida - Malleidae

Alternative spelling: Hippochaeta

Parent taxon: Isognomon according to L. W. Ward 1992

See also Matsubara 2002 and Sepkoski 2002

Sister taxa: Isognomon (Iranognomon), Isognomon (Isognomon), Isognomon (Melina), Isognomon (Mulletia), Isognomon (Parviperna), Isognomon (Semignomon), Isognomon alatus, Isognomon bicolor, Isognomon gariesensis, Isognomon gaudichaudi, Isognomon isognomoides, Isognomon isognomon, Isognomon isognomonoides, Isognomon legumen, Isognomon maxillata, Isognomon nucleus, Isognomon orientalis, Isognomon perna, Isognomon quadrisulcata, Isognomon radiatus, Isognomon repini, Isognomon valvanoi

Subtaxa: Isognomon (Hippochaeta) hataii

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Ecology: stationary epifaunal suspension feeder

Distribution:

• Miocene of United States (23: Delaware, Maryland, North Carolina, Virginia collections)

• Oligocene of Austria (2)

• Eocene of Japan (7)

Total: 32 collections each including a single occurrence

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