NMITA:Neogene Marine Biota of Tropical America

Specimen Details | Enlarge
Specimen Details | Enlarge

Thysanus corbicula Duncan, 1863

Synonymy: Thysanus vaughani Weisbord, 1971;Thysanus floridanus Weisbord, 1974;

Holotype: BM(NH) R28795

Morphologic Description:
Meander series sinuosity: straight
Colony size: small (<10cm)
Attachment of skeleton: free-living
Epitheca: absent
Wall development between buds: never
Symmetry of bud geometry: uni-directional
Calice or valley width: large (10-15mm)
Calice relief: low (<2mm)
Calicular platform shape: u-shaped
Coenosteum: absent
Exothecal dissepiments: absent
Number of septal cycles: >4
Septal spacing (per 5mm): >12
Relative septa thickness: unequal
Relative costae thickness: unequal
Septal lobes: absent
Paliform lobes: present
Columella continuity: continuous
Columella width: <=1/4
Endothecal dissepiments: rare
Wall structure: parathecal
Double or single wall: single

Early Miocene to Middle Miocene : Chipola Fm., Chipola River, Florida;
Late Miocene to Early Pliocene : Gurabo Fm., Rio Mao, Dominican Republic;
Late Pliocene : Bowden Fm., Bowden seacliff, Jamaica; Shark's Hole Fm., Isla Bastimentos, Panama;
Late Pliocene to Early Pleistocene : 'Old Pera' beds, Pera Point, Jamaica; 'Old Pera' beds, Pera Point, Jamaica;
Early Pleistocene : Caloosahatchee Fm., Shell Creek, Florida;

Last updated on June 17, 1998-kgj.

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