Dictyococcites danicus Black, 1967
Praenoelaerhabdus Mihajlovic, 1993
Nannoserratolithus Martini & Schiller, 1998
The plug may or may not cover the entire central area distally. Under the light microscope, the tube cycle and the plug cannot be distinguished from each other.
Elliptical Groups
Dictyococcites stavensis Group
Plug completely closed the central area
Dictyococcites pseudolockeri Group
The plug partly closed the central area.
Circular Group
Dictyococcites erbae Group
Plug completely closed the central area
Circular to elliptical placoliths comprise single-tiered distal and proximal shields, a single tube cycle that is often entirely, rarely partly closed the central area distally, and a central area with a permanent central cover proximally.
Dictyococcites differ from Noelaerhabdus by lacking a distal process and from Reticulofenestra and Cyclicargolithus by having a permanent central cover and a tube cycle that often completely or rarely partially closes the central area distally. The genus Cribrocentrum also has a permanent central cover, but its tube cycle is confined to the periphery of the central area.
The species of Dictyococcites are distinguished by their size in this study:
An overview of Dictyococcites species is presented in Table 4 in Varol (2025a).
Optical Properties: All components exhibit inclined extinction lines and length-fast (-) elongation. The extinction angle measured on the distal side is typically about 9° on the distal shield, but it can not be measured in the tube cycle due to the oblique orientation of the tube cycle segments. The apparent angle between extinction on the tube cycle is 67°, corresponding to an obliquity angle of 23°.
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