Antennule: front appendage in ostracodes, used for swimming or stability.
Aperture: opening in foraminifera through which most of the soft tissue projects.
Autotroph: organism that synthesizes organic compounds from inorganic materials. Such organisms are sometimes called producers.
Benthos: bottom-dwelling organisms.
Calcite compensation depth (CCD): depth in the oceans at which calcite becomes unstable and may dissolve. Carapace: term for "shell" used for ostracodes. Centrales: circular diatoms with radial symmetry. Chamber: one repeated element of calcareous foraminiferal tests.
Coniform: cusp-shaped conodont elements. Diatomites: lithified diatom oozes.
Heterotroph: organism that consumes other organisms or decaying matter. Such organisms are sometimes called consumers.
Holococcoliths: coccoliths formed from identically sized calcite crystals.
Infaunal: organism living within sediment. Megaspores: large spores up to 4 mm in diameter.
Nannofossils: submicroscopic fossils generally less than 50 |lm. Nannoplankton: submicroscopic floating organisms. Nassellaria: radiolarians with conical tests. Paleobathymetry: depths of ancient marine deposits. Palynology: study of spores and pollen. Pectiniform: broad-based, multicusped conodont elements. Pelagic: organism living within the water column. Pennales: elliptical diatoms with bilateral symmetry. Photic zone: lighted part of the water column. Phytoplankton: microscopic, photosynthetic, floating organisms. The two main groups are the diatoms and dinoflagellates. Planktic: floating lifestyle within the water column. Primary producers: equivalent to autotrophs. Organisms that produce organic substances from inorganic material. Primary producers are usually photosynthetic organisms. Protoplasm: very general term for material contained within the cell.
Pseudopodia: strands of protoplasm that aid locomotion and trap food in foraminifera.
Ramiform: blade-like, multicusped conodont elements.
Setae: sensory bristles in ostracodes.
Spumellaria: radiolarians with spherical tests.
Test: term for "shell" used for foraminiferans and radiolarians.
Zone fossils: fossils that characterize particular sections of the stratigraphic record.
Zooplankton: non-photosynthetic floating organisms, that feed on phytoplankton or suspended organic matter.
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