2018年5月23日 · Diatoms belong to the taxonomic phylum Bacillariophyta. There are approximately 10, 000 known diatom species. Of all algae phyla, diatom species are the most numerous. Diatoms frustules are used to differentiate species. Diatom frustules are composed of very pure hydrated silica within a layer of organic, carbon containing material.

2018年5月18日 · Most diatoms are unicellular, but some are colonial or filamentous. Most are photosynthetic, but some species lack chlorophyll and live heterotrophically among decaying marine algae. Pennate (i.e. bilaterally symmetrical) diatoms occur in both freshwater and marine habitats; centric diatoms (i.e. radially symmetrical) occur predominantly as ...

2018年6月11日 · Bacillariophyta A phylum of algae comprising the diatoms. These marine or freshwater unicellular organisms have cell walls (frustules) composed of pectin impregnated with silica and consisting of two halves, one overlapping the other. Diatoms are found in huge numbers in plankton and are important in the food chains of seas and rivers.

2018年6月11日 · dinoflagellates A division (Dinoflagellata) of protists that are heterotrophs but closely allied to brown algae and diatoms (they are sometimes classified as algae). Many have brown or yellow chromoplasts containing xanthophyll and chlorophylls a and c; others are colourless. Typically, dinoflagellates have two flagella, one propelling water to ...

2018年6月8日 · Chrysophyta (krəsŏf´ətə), phylum (division) of unicellular marine or freshwater organisms of the kingdom Protista [1] consisting of the diatoms [2] (class Bacillariophyceae), the golden, or golden-brown, algae (class Chrysophyceae), and the yellow-green algae [3] (class Xanthophyceae).

A small particle feeder that feeds in near-surface coastal waters, generates water currents by the slow swimming movements of antennae and maxillipeds and captures food particles in laminar flow fields. Omnivorous, with diet including wide range of minute unicellular phytoplankton such as diatoms, dinoflagellates, ciliates, and tintinnids.

2018年5月21日 · The amoeba, for example, is capable of detecting chemicals given off by potential food particles such as diatoms, algae, bacteria, or other protozoa. As the cell wall has no definite shape, the cytoplasm can extrude to form pseudopodia (Greek: pseudes , false; pous , foot) in various sizes and at any point of the cell surface.

Other species of dinoflagellates synthesize the biochemicals responsible for diarrhetic shellfish poisoning, while certain diatoms produce domoic acid, which causes amnesic shellfish poisoning. The poisons produced by these marine phytoplankton are commonly present in the marine environment as trace contaminations.

The spirolophous lophophore collects food items—primarily phytoplankton, diatoms, superficial meiobenthos, suspended organic material, and dissolved organic material. reproductive biology. The eggs are freely spawned; they undergo radial cleavage and embolic gastrulation. The body cavity develops from a modification of the embryonic gut.

Marine halfbeaks, on the other hand, tend to feed on algae, diatoms, and sea grasses, though some species eat small fishes. Planktivorous marine beloniforms include the flyingfishes and sauries. Ricefishes are omnivorous and will eat plankton, small insects, detritus, and plant material. Beloniformes themselves often fall prey to larger fishes.