Set number: 1112

  • Blackites incompertus VR 02978 1
  • Blackites incompertus VR 02981 2
  • Blackites incompertus VR 02983 3
  • Blackites incompertus VR 02988 4
  • Blackites incompertus VR 02979 5
  • Blackites incompertus VR 02980 6
  • Blackites incompertus VR 02982 7
  • Blackites incompertus VR 02984 8
Blackites incompertus, Middle Eocene, DSDP Leg 39, Sites 356, Sào Paulo Plateau, South Atlantic Ocean
Final Epithet
Blackites incompertus Roth, 1970

Blackites incompertus Roth, 1970


Species of Blackites Blackites Hay & Towe (1962) with a narrow base. The long and narrow distal process tapers to a point [always slightly broaden at the middle but never as broad as the base]. The inner cycles of the base are birefringent in the side view. The surface of the distal process is smooth.

This species was erroneously assigned to Blackites tenuis (Bramlette & Sullivan, 1961) Sherwood (1974) in the publications.


Blackites incompertus is identified from Blackites tenuis by having a distal process slightly broaden in the middle, whereas the latter has a distal process that gradually tapers to a point.


Bramlette, M. N. & Sullivan, F. R., (1961): Coccolithophorids and related nannoplankton of the Early Tertiary in California. - Micropaleontology. 7(2): 129-188.

Roth, P. H., (1970): Oligocene calcareous nannoplankton biostratigraphy. - Eclogae Geologicae Helvetiae. 63: 799-881.

Sherwood, R. W., (1974): Calcareous nannofossil systematics, palaeoecology and biostratigraphy of the Middle Eocene Weches Formation of Texas. - Tulane Studies in Geology. 11: 1-79