| Size under dissecting microscope: 180-190µm Size under compound microscope: 180µm |
| Morphology: This is a small protoconch with sculpture consisting of a coarse raised network overlain by five widely spaced lines. These lines are difficult to see with the light microscope, but show up clearly in the SEM. The anterior portion of the shell is smooth. The aperture is slightly sinuous and flared at the anterior edge and it has a medium-width rim, tapering toward the posterior. |
| Frequency: Pump EPR 1999-2000: Occasional Pump EPR 2004: Occasional Trap EPR 2004-2005: Not collected |
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Unknown 7 is most likely to be confused with Unknown 9, which has a similar type of sculpture. Unknown 9 is slightly larger and some of its lineate sculpture extends all the way to the aperture, whereas all five lines in Unknown 7 stop well short of the aperture. Unknown 9 is also about shorter in height for its diameter than Unknown 7. The approximate height:diameter figures are 110:190µm for Unknown 9 and 125:180µm for Unknown 7. |
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Unknown 7's sculpture and size are similar to that of Unknown 8. Unknown 8 has more closely spaced lines and it is also greater in height for its diameter than Unknown 7. The approximate height:diameter figures are 135:190µm for Unknown 8 and 125:180µm for Unknown 7. |
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