Monomorphic | all coccoliths of similar type (e.g. Coccolithus). |
Dimorphic | coccoliths of two discrete types (e.g. Scyphosphaera). |
Polymorphic | coccoliths of more than two discrete types (e.g. Syracosphaera pulchra). |
Varimorphic | coccosphere with coccoliths whose size and/or morphology varies according to position on the coccosphere (e.g. Helicosphaera). {Young et al. 1997} |
Dithecate | with two discrete layers of coccoliths of different types (e.g. Syracosphaera pulchra). |
Endotheca | inner layer of coccoliths of dithecate coccosphere. |
Exotheca | outer layer of coccoliths of dithecate coccosphere. |
Monothecate | with a single layer of coccoliths (e.g. Scyphosphaera). |
Multilayered | with two or more layers of coccoliths but no differentiation into endo- and exotheca (e.g. Emiliania, Florisphaera, Coccolithus pelagicus phase hyalinus). |
Shape | coccospheres
are three-dimensional so their shape should be described using
appropriate terms for solid objects. Useful terms include: cylindrical, ellipsoidal, fusiform (elongate with tapering ends), obpyriform (inverse pear-shaped), ovoid (egg-shaped, i.e. one end broader than the other), spherical. See also Heimdal (1993), Jordan et al. (1995). |