### animal:

Rotifer
* All rotifers have a corona of cilia surrounding their mouth.
* Most rotifers are colorless, except for the eyespot
  - females
  - oviparous but a few planktonic species are viviparous
* Most rotifers collect food by beating the wheel organ to make a water current
* Most rotifers exist in freshwater habitats
* Most rotifers have ability
  - one eye, some have two and some sessile ones are eyeless
* Most rotifers live in ponds
  - small ponds
* Some rotifers are free swimming, others move by inching along, and some are fixed
  - attract attention
  - avoid consumption
  - build tubes
  - cause diseases
  - compete for food
  - emerge from dormancy
  - enter dormancy
  - feed on algae and then themselves are eaten by worms and crustaceans
* Some rotifers have ducts
  - single spikes
* Some rotifers inhabit environments
  - saltwater environments
* Some rotifers live in habitats
  - vary habitats
  - lose water
* Some rotifers survive dry summer
* Some rotifers use reproduction
  - sexual reproduction.
  * The 'rotifers' are a phylum of tiny animals which are common in freshwater environments, such as ponds and puddles. There are a few saltwater species. Some rotifers are free swimming, others move by inching along, and some are fixed. They live inside tubes or gelatinous holdfasts that are attached to a substrate A few species live in colonies. Microscopic Anatomy of Invertebrates' vol 4. Wiley-Liss, New York
* are able to consume both microbes and particulate matter
  - animals, in fact
* are common in freshwater throughout the world, with a few saltwater species
  - members of freshwater zooplankton
  - common, abundant, and highly successful members of marine and freshwater communities
  - complex organisms with various types of organs and structures
  - eukaryotic
  - flattened simply by placing a coverslip on top of the droplet
  - highly efficient reproducers
  - in turn prey to carnivorous secondary consumers, including shrimp and crabs
  - invertebrates
  - microscopic and abundant in freshwater
* are multicellular animals with body cavities that are partially lined by mesoderm
  - plankton that many species feed on
  - primarily omnivorous, but some species have been known to be cannibalistic
  - small animals with simple body forms
* are small, multi-cellular animals, mostly living primarily in freshwater
  - multicellular animals that live freely or in tubes attached to a substrate
  - specialists at living in habitats where water dries up regularly
  - tiny animals that inhabit fresh water, the ocean, and damp soil
  - top-shaped and have a foot
  - very widespread aquatic animals, very common in freshwater habitats
* can be free swimming or sessile
* can reproduce in a variety of mediums, the most common of which phytoplankton culture
  - ways
* contain a certain and consistent number of cells as adults.
* contribute to both the microbial loop and to higher trophic levels
  - the removal of effluent turbidity by removing non-flocculated bacteria
* display a variety of reproductive modes.
* eat algae and other protists, bacteria, and even other rotifers
  - algae, single celled organisms , debris, bacteria and other zooplankton
* eat bacteria, detritus, other rotifers, algae or protozoa
  - protists, and other small animals
  - fish waste , dead bacteria , and algae
* experience events.
* fall into two salinity categories - marine and freshwater.
* give to both of the microbial loop and to higher trophic levels.
* have a complete digestive tract with a mouth and anus
  - foot attached to their posterior end and it includes a cement gland in a toe
  - number of unusual features
  - very high metabolism and can quickly deplete the oxygen in the water
* have bilateral body symmetry
  - eyes, corona, stomach, foot and toe
  - no regeneration or repair abilities
  - real organs, including a brain, stomach and intestines
  - specialized organ systems
* includes brains
  - cell membranes
  - corpi
  - cytoplasm
  - ears
  - faces
  - heads
  - nuclei
  - plasma membranes
  - sections
  - skulls
  - vacuoles
* is an invertebrate
* move by swimming freely or crawling.
* move by swimming or crawling on the bottom of the lake
* occur at all except polar latitudes.
* possess a structure called a mastax which is unique in the animal kingdom.
* primarily eat phytoplankton, bacteria, and detritus.
* produce by parthenogenesis, in which females produce offspring from unfertilized eggs.
* tend to be primarily omnivorous , so they eat both plant and animal material.
+ Desiccation, Biology, Extreme cases, Rotifers: Physiology :: Ecology
+ Rotifers, Appearance
  - History and taxonomy: Extremophiles
  * They are an important part of the freshwater zooplankton. Also, many species help decompose organic matter in soil. Rotifers eat fish waste, dead bacteria, and algae. They eat particles up to 10 micrometres in size. A rotifer filters 100,000 times its own volume of water per hour. They are used in fish tanks to help clean the water, to prevent clouds of waste matter
  - Resisting drought