Polemidia

Polemidia

: 13.6-11.6
:
: Pakhna Formation
: Deeper offshore marine shelf
: Planktonic pteropods (Diacria trispinosa), small bivalves
: Quiet, open water with slow-settling carbonate mud; drifting plankton; occasional fine bioclastic rain from distant shallows

Polemidia shown on the globe

Unknown autobranch, possibly a Pectinid or Lucinid

(?)Leaf

Molds of at least seven individuals; the original shell material doesn't seem to be preserved

Measurement 6-7mm

An outline can be seen, as well as the (dorsal?) ribs.

+4

Molds of at least seven individuals; the original shell material doesn't seem to be preserved

Measurement 6-7mm

An outline can be seen, as well as the (dorsal?) ribs.

Ventral view. The aperture is visible as well as the three ribs that characterize the species; a wide central one and a slimmer one on either side

An outline can be seen, as well as faint ribs. Dorsal view

Dorsal view at an angle, so that the curvature at the aperture is visible

Many of the individuals are not well-preserved, with minimal details visible

Unknown. Possibly a mollusc?