?Tretomphalus sp. Class Foraminifera. OBIS genus link

Tretomphalus dorsal side Tretomphalus ventral side

Size under dissecting microscope: ~250-300µm in diameter
Roughly spherical foraminiferan with coarse perforations on the ventral surface (above right). The dorsal surface is composed of a brownish spiral of increasing sized flat chambers; the whole specimen appears to be a benthic foraminiferan with an inflated chamber (similar to those in planktonic species) on the ventral side. Our specimens have been examined by an expert (S. Richardson) and appear similar to the dispersal form of the genus Tretomphalus, a shallow-water benthic group. Most, though not all, are empty shells.
Pump EPR 1999-2000: Occasional
Pump EPR 2004: Not collected
Trap EPR 2004-2005: Not collected

Can be confused with

Planktonic foram
At first glance Tretomphalus might be mistaken for a chamber of a planktonic foraminiferan, such as is shown at left, but these do not have the flat-chambered spiral shown above left.

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