Bivalvia - Mytilida - Mytilidae

Synonym: Liebea vaengensis Kulikov 1967

Full reference: H. Chronic. 1952. Molluscan fauna from the Permian Kaibab Formation, Walnut Canyon, Arizona. Geological Society America Bulletin 63(2):95-166

Belongs to Promytilus according to H. Chronic 1952

Sister taxa: Promytilus acinaciformis, Promytilus annosus, Promytilus borealis, Promytilus cancellatus, Promytilus ensiformis, Promytilus illinoisensis, Promytilus laevis, Promytilus maiyensis, Promytilus mazzolenii, Promytilus mytiliformis, Promytilus pottsvillensis, Promytilus priscus, Promytilus semiorbicularis, Promytilus swallovi, Promytilus vetulus

Type specimens:

• Promytilus retusus: Mus N. Ariz G2.347, a valve (Left valve). Its type locality is Bottomless Pits, Bed 9, Kaibab Formation, Walnut Canyon, which is in a Roadian shallow subtidal limestone in the Kaibab Formation of Arizona.
• Liebea vaengensis:

Ecology: stationary semi-infaunal suspension feeder

Average measurements (in mm): valve length 11.4