Class: Spirillinata    Subclass: Ammodiscana    Order: Spirillinida    Family: Ammodiscidae
Ammodiscus semiconstrictus Gutschick&Treckmann, 1959
     Morphological Attributes:
Wallmaterial: agglutinated
Overall appearance: round and flat
Coiling: tubular enrolled
Chamberform: tubular
Aperture Position: terminal
Aperture Form: round oval reniform, no tooth, no neck, no lip
Sutures: depressed, curved, --
Ornamentation: --, --, --, --



type specimen
holotype
Carboniferous
Pennsylvanian


unknown
FEU-1020051
identified by scientist

Carboniferous
Mississippian
Lower Mississippian
Midwestern USA
Chouteau Group
FEU-1004928
identified by scientist

Carboniferous
Mississippian
Lower Mississippian
Midwestern USA
Hannibal FM
FEU-1004787