Hystrichosphaeridium microfurcatum Deunff, 1957

Now Ammonidium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Ammonidium. See also Veryhachium (incorrect citation).
Holotype: Deunff, 1957, fig.2 - p.13
Age: Middle Devonian