Original description: Thick-walled shell with about three rows of pores on one segment. Pores nearly in checkerboard order. The constrictions between the segments are short. The surface of the cephalothorax rather rough. Remarks on original description: The description is based on 11 specimens from Sites 138 and 140, and 7 specimens from Holes 278 (Core 21), and 280A (6, CC).
Biogeography and Palaeobiology
Similar species Geographic distribution Paleobiology Phylogenetic relations
Geological Range: Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group" First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes