†family Helodontidae (chimaera)

Chondrichthyes - Helodontiformes - Helodontidae

Parent taxon: Helodontiformes according to J. S. Nelson 2006

See also Zangerl 1981

Sister taxa: none

Subtaxa: Helodus

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Ecology: nektobenthic carnivore

Distribution:

• Permian of Australia (1 collection), Greenland (1), United States (5: Wyoming)

• Pennsylvanian of the United Kingdom (1)

• Chesterian of Canada (1: Alberta)

• Carboniferous of the United Kingdom (3), United States (2: Arizona, Nebraska)

• Mississippian of the United Kingdom (1), United States (1: Indiana)

Total: 16 collections including 22 occurrences

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