### microalga:

Diatom
* Many diatoms are heterovalvate, i.e., the two valves of the frustule are dissimilar
  - move by oozing cemicals out of slits in their cell walls and then gliding in the slime
* Most diatoms are diploid
  - planktonic, but some are bottom dwellers or grow on other algae or plants
  - unicellular , although some form chains or simple colonies
  - continue their life cycles via an obligatory sexual phase
  - exist singly, although some join to form colonies
* Most diatoms have reproduction
  - sexual reproduction
* Some diatoms are responsible for objectionable odors and tastes in drinking water
  - enter bloodstreams
* Some diatoms find in oceans
* Some diatoms grow in cool ocean water
* Some diatoms grow on appendages
* Some diatoms have cell wall layers
  - pairs of thin spines or setae projecting from the ends of the cells
  - salinity
  - live as free floating cells in the plankton of ponds, lakes and oceans
* Some diatoms produce antibacterial compounds
  - substances
  - resist sinking by forming chains.
  * They are one of the most common types of phytoplankton. Most diatoms are unicellular, although some form chains or simple colonies. These walls, called frustules, take many forms, some quite beautiful and ornate. They usually consist of two asymmetrical sides with a split between them, which gives the group its name.
  * have some practical uses. Diatom communities are a popular tool for monitoring environmental conditions, past and present. They are commonly used in studies of water quality. They are also of interest to nanotechnology
* account for most of the marine primary production
  - twenty-three percent of the primary productivity of the world
* also contain polysaccharides of the chrysolaminaran type
  - grow on most soil
* appear to be the major component of their diet.
* are 'phytoplankton' or the 'grass of the oceans'.
* are a crucial component of the ocean food web
  - group of algae known to store excess photosyntate as lipid
  - special group of algae with cell walls made of silicate
* are a type of phytoplankton that form the base of the marine food chain
  - protozoa
* are a very common types of phytoplankton
  - successful group of organisms that live in virtually every body of water
* are able to get rid of waste by the tiny holes that are found in the cell wall
  - locomote
* are abundant in both greenish gray and olive-gray intervals
  - only in laminated sequences
* are algae that comprise the main photosynthetic group responsible for primary productivity
  - with distinctive, transparent cell walls made of hydrated silica
  - almost all photosynthetic
* are also abundant in soil and have even been gathered from air samples
  - filter-feeders
* are also the organisms that turn the mud in our cores a green color
  - source of much of the world's petroleum deposits
* are among the most abundant photosynthetic organisms in marine waters
  - numerous of all unicellular algae in the oceans
* are an extremely diverse and numerous group of microscopic plants living in the ocean
  - important element in stratigraphic dating systems
* are aquatic and occur in both fresh and marine environments
  - protists whose shells are made of the chemical compound silica
  - basically unicellular
  - beautiful single celled organisms
  - circular or oblong shaped
  - common to abundant and exhibit moderate to good preservation
  - diplontic
  - divided into two Orders
  - easily prepared for veiwing using a light microscope
  - eukaryotes
  - eukaryotic algae, one of the most common types of phytoplankton
  - examples of algae with secondary chloroplasts derived from an endosymbiotic red alga
  - extremely unique organisms
* are important components of the diets of aquatic animals
  - producers in aquatic food chains
  - in two shells and make the water brown
  - key members of the plant plankton
  - magnificent lifeforms to study under the microscope
  - marine or freshwater unicellular or colonial algae
* are microscopic algae living in both fresh and salt water
  - single celled plants that can be found in or near water
  - sized hard shelled creatures found in both marine and fresh waters
  - water plants
* are microscopic, single-celled algae that live in marine or fresh water
  - unicellular algae, abundant in marine and fresh water
  - more energy-giving than detritus, and so are responsible for larval growth
  - often the group of choice among periphytic algae
* are one of the most abundant plants on the planet
  - vast varieties of protists
* are one-celled plants that live in the shells and are a primary source of food in the sea
  - protists, which by definition are neither plants nor animals
  - organisms that live in sediments
  - perfectly symmetrical
  - photosynthetic unicellular organisims with unique double shells made of silica
  - photosynthetic, but have rigid cell walls reinforced with silicon rather than cellulose
  - planktonic organisms that are composed of silica
  - present in great abundance in most aquatic ecosystems
  - primary producers that capture sunlight to fix carbon
  - protists that grow a silica shell around themselves
* are relatively rare despite high abundances in the overlying surface water
  - young among the photosynthetic eucaryotes
  - sea creatures the size of a pin head
* are single celled phytoplankton that can occur as individuals or as long chains
  - cells encased in silica shells
  - single-cell plants inside a silica skeleton
* are single-celled algae that add silica to their cell walls for strength
  - organisms with nuclei and chloroplasts
* are single-celled photosynthetic algae
  - organisms that float in plankton
  - small, single-celled algae that live in water
  - so numerous that their shells form thick deposits all over the world
  - still very much a part of nature's way, being found in any body of water
* are the chief food for marine invertebrate larvae such as trochophores, bipinnaria, etc
  - dominant species of phytoplankton and are a major component in the food web
  - main primary producers in the oceans and are also very common in freshwaters
* are the most abundant microalgae among phytoplankton
  - common type of phytoplankton
  - prevalent species of phytoplankton
  - original creatures living in glass houses
  - predominant phytoplankton
  - smallest plants in the ocean
  - tiny one-celled algae that live in marine or fresh water
  - typically much larger than coccolithophores and can be seen under low magnification
  - ubiquitous and occur in abundance in both fresh and marine environments
* are unicellular algae and the frustules have a very regular ornamentation and shape
  - and golden-brown in color
  - organisms found in both marine and fresh water environments
* are unicellular organisms that lack a flagellum
  - live mostly as part of the plankton
  - with silica shells
  - phytoplankton which have cell walls that are made of silica
  - unicellular, eucariotic, photoautotrophic microorganisms like algae
  - usually golden-brown in color and contain chlorophylls a and c, and xanthophyll
* are very common and unicellular
  - good indicators of water quality
* are very important in aquatic food chains
  - both freshwater and marine ecosystems
  - rare and poorly preserved, and siltstone clasts are a source of reworked diatoms
* can be either radially or bilaterally symmetrical
  - occur in a more compact form as a soft, chalky, lightweight rock, called diatomite
* comprise the majority of algal cells seen in the samples.
* consist of two shells made of glass silicone dioxide.
* contribute most of the silica.
* dominate the phytoplankton
  - shallow coasts, but decrease in abundance seaward
* extract silica from water to build their cell walls.
* form a major part of the plankton in both fresh water and ocean water.
* grow as single cells or form filaments and simple colonies
  - in cold water wherever there is light
  - on the skin of some species, including the blue whale
* have a cell wall comnprised of two halves technically referred to as valves
  - golden-brown pigment
  - two-part cell wall made of silica
* have an external skeleton made of silica that is divided in two pieces
  - outer cell wall made of silica
  - beautiful, glasslike cell walls
  - cell walls made of silica, and many form long chains of cells
  - differing abilities to move, depending on the species
  - glass-like walls and a wide variety of lovely, symmetrical shapes
  - hard shells made up in part by silica, or glass
  - odd little shells made of organic compounds impregnated with silica
* have silica based skeletons, so availability of silica can affect primary productivity
  - shells in two halves that fit together like an old pill-box
  - tests
  - silicon in their cell walls
  - unique shells, which serve as their cell wall
  - corpi
  - plant parts
  - vacuoles
* is algae
* live anywhere there is water, including lakes, streams, estuaries, oceans, and puddles.
* live in aquatic and semi-aquatic habitats
  - fresh or ocean water and make their own food from sunlight, like plants
* look like two shells that fit together.
* make up the first links in the aquatic food chain.
* move by secreting substances from their shell.
* occur abundantly in fresh and salt waters, in soil, and as fossils
  - in both fresh and saltwater
* often appear to be brown
  - yellow-brown, and can color the water noticeably
  - form extensive blooms in temperate and boreal seas
  - produce intricate shells made from silicon dioxide that persist long after they die
* only construct new walls during cell division.
* possess a unique, glassy cell wall containing silica
  - unique silica shells or frustules which are composed of biogenic silica
* produce a unique carbohydrate called chrysolaminarin
  - domoic acid, which is the causative agent and exhibits glutamatelike activity
  - oil, both to store chemical energy from photosynthesis and to increase buoyancy
* proliferate in the glacial Arctic Ocean around the edge of the Antarctic continent.
* represent gradual oligotrofication of water.
* reproduce asexually in an unique manner.
* reproduce by cell division
  - dividing in half
  - mainly through binary fission
  - mostly by cell division, a type of asexual reproduction
* reproduce through cell division at rapid rates, which can create a plankton bloom
  - cellular division and also sexually
* seem to be primitively oogamous.
* store their energy as oils or carbohydrates
  - food in a polysaccharide called laminarin, just like golden algae do
* use oils to store sugar
  - sunlight to make food through the process of photosynthesis
  - the pigments chlorophyll a and c to collect energy from the sun through photosynthesis