Two new species of fossil mayflies (Ephemeroptera: Neoephemeidae and Siphlonuridae) from the Ruby River basin (Oligocene) of southwestern Montana

S. E. Lewis

1977

Article

Proceedings of the Entomological Society of Washington 79:583-587

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Taxa discussed in this work:

• Isonychia alderensis
• Potamanthellus
• Potamanthellus rubiensis

Taxonomy:

• Potamanthellus belongs to Neoephemeridae - Lewis (1977)
• Potamanthellus rubiensis belongs to Potamanthellus - Lewis (1977)
• Isonychia alderensis belongs to Isonychia - Lewis (1977)
• Isonychia belongs to Isonychiidae - Lewis (1977)