NMITA:Neogene Marine Biota of Tropical America

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Thysanus corbicula Duncan, 1863

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

Distribution:

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;