The sheer diversity and variation of Family Haplognathidae is enough to give occlupanologists nightmares. They are defined by the single squared-off dential process in the middle of the oral groove.
Athyrmidion imagiglacialis
Dicrania vugada
Indescribus conundrum
Inflatisoma asymmetrica
Megavegivendus crassicorpa
Megavegivendus gigas
Ortholongus belluscriptorum
Ortholongus minornotatus
Ortholongus welbyi
Panivexillum prolixus
Panivexillum turritus
Spongipaginus hiatus
Stomatocardia bibliophora
Stomatocardia distortia
Stomatocardia lobilatera
Stomatocardia maximus
Stomatocardia minima
Stomatocardia latus
Stomatocardia obtusa
Tenuicinigulum initialis
Tenuicinigulum spurinux
Ungella adopertus
Ungella fortis
Ungella vescus
Unidentia quadratus
Unidentia ehrus
Unidentia identicalis
Unidentia kinkani
Unidentia oblongaris
Unidentia obtusamaxilla
Unidentia obtusamaxilla ammon
Unidentia obtusamaxilla azureus
Unidentia obtusamaxilla brevis
Unidentia wrightae
Vadosulpalpus amplusulcia
Vadosulpalpus crustulum
Validolobus teleplanktos
