NMITA:Neogene Marine Biota of Tropical America

---

Thysanus sp.A Budd and Johnson (cc97), 1997

Holotype: none

Morphologic Description:

Meander series sinuosity: gently curved

Colony size: medium (10-30cm)

Attachment of skeleton: free-living

Epitheca: absent

Wall development between buds: never

Symmetry of bud geometry: uni-directional

Calice or valley width: small (<5mm)

Calice relief: low (<2mm)

Calicular platform shape: v-shaped

Coenosteum: absent

Exothecal dissepiments: absent

Number of septal cycles: 3

Septal spacing (per 5mm): <6

Relative septa thickness: equal

Relative costae thickness: equal

Septal lobes: absent

Columella continuity: continuous

Columella width: <=1/4

Endothecal dissepiments: rare

Wall structure: parathecal

Double or single wall: single

Distribution:

Early Pliocene to Late Pliocene : Q.Chocolate Fm., Q. Chocolate, Costa Rica;

Late Pliocene : Bowden Fm., Bowden Shell Beds, Jamaica; Q.Chocolate Fm., Buenos Aires, Costa Rica; Q.Chocolate Fm., Buenos Aires, Costa Rica; Q.Chocolate Fm., Buenos Aires, Costa Rica; Moin Fm., Pueblo Nuevo, Costa Rica;