Boudreaux & W.W.Hay, in Hay et al. (1967)
Coccoliths with the central area spanned by a bridge structure; proximal and distal shields usually solid.
Size and bridge angle of G. caribbeanica are very similar to those of G. muellerae, the only apparent difference being a closed central area in G. caribbeanica. The latter is rarely found in living assemblages but is common in Late Quaternary sediments. Records of G. caribbeanica from the plankton in older literature (e.g. Nishida, 1986) mostly refer to morphotypes that would now be placed in G. muellerae. Bollman (1997) provided a summary of Gephyrocapsa species and included the measurements for G. caribbeanica (holotype) with a bridge angle of 45° and coccolith length of 4.1 μm (Boudreaux & Hay, 1969). Gephyrocapsa muellerae (holotype) has an bridge angle of 23° and coccolith length of 3.9 μm (Bréhéret, 1978).
Genus description: Coccoliths of intermediate size, with a low to intermediate bridge angle; central area closed or almost closed.
64º16'S 136º06'E Nishida (1986)