Description

DISCUSSION This medium-sized rhabdolith (c. 11 µm length) is marked by a very wide basal plate (c. 4.8 µm) and a lensiform stem, which maximum width is located in the upper half of the stem. The latter, which presents a basal collar, seems to be thin-walled (Fig. 20 L) and rugose towards the top. These rhabdoliths bear great resemblance with those of B. gladius (Varol 1989: pl. 4, fig. 5; Bown 2005: pl. 21, figs 10 - 14). However, they differ by certain features of the stem, which is relatively longer and more slender in B. aff. gladius, especially in the top part, as well as by the position of its maximum width. The latter is less distal compared to its position in B. gladius.

Common Names

Taxonomic Hierarchy

Kingdom: Chromista

Phylum: Haptophyta

Class: Prymnesiophyceae

Order: Syracosphaerales

Family: Rhabdosphaeraceae

Genus: Blackites

Species: Blackites gladius (Locker, 1967) Varol, 1989