This rare form of Isopod occurs in the Grey Chalk of Southern England.  Only the tail end has ever been recorded from Britain, but rare heads have been found in the Early Danium (Palaeocene) Chalk of Denmark; some examples are given below.

1).  Isolated abdomen; x4, Southerham Grey Pit, near Lewes, East Sussex, West Melbury Marly Chalk Formation, Randell Collection RR1100.

A	B
	C

2).  Danish material for comparison; Palaega danica; (A) body section (x1.7); (B)(C) heads (x5.0); glacial drift south of Thyboroen, west coast of Denmark, originating from the Early Danium, Palaeocene, Schmidt Collection.  Images © Andy Schmidt, 2005, by kind permission.