### animal | arthropod | spider | tarantula:

Blue tarantula
* Most blue tarantulas have abdomens
* possess fangs.

Male tarantula
* Most male tarantulas have abdomens.
* are longer and slimmer than females and have much smaller abdomens than females
  - sexually mature after their final molt
* leave the female's territory soon after mating to avoid being killed or eaten.

Water spider
* Some water spiders can walk on water without sinking.
* breathe air.
* build bubble nests to house their young.
* live their lives under water but still breathe air.
* use silk to house their eggs while underwater.

Widow spider
* Most widow spiders go through phases.
* Most widow spiders prey on insects
  - other insects
* Some widow spiders belong to families
  - bite people
  - cause death
* are most likely to bite if there are eggs present in the web
  - poisonous spiders
  - well known for their potentially dangerous bite
* belong to the cobweb spider family and spin loosely organized trap webs.
* feed on a wide variety of arthropods.
* prefer to nest near the ground, in dark, undisturbed areas.

Wolf spider
* Many wolf spiders are large, sometimes they have body lengths of around one inch
  - have very long copulations with many many insertions
* Most wolf spiders catch prey
  - eat prey
  - feed on insects
  - have legs
  - wait for prey
* Some wolf spiders dig burrows
  - live in burrows
* hunt for food.
* inhabit ranges.

Young spider
* Most young spiders mature to adults in about one year.
* use the catkin-like oak flowers as niches, where they trap small insect meals.

### animal | arthropod:

Tardigrade
* All tardigrades possess a bucco-pharyngeal apparatus, a complex structure.
* Some tardigrades are carnivores
  - entirely carnivorous.
  * have a cylindrical shape with four segments, each with two legs. Each of their limbs have little claws. The biggest adults may reach a body length of 1.2 mm, the smallest below 0.1 mm. Freshly hatched larvae may be smaller than 0.05 mm. Tardigrades feed on plant cells by penetrating the cell wall and eating what is inside. Some tardigrades are carnivores.
  * are able to live in environments that would kill most animals. In 2007, scientists discovered that some tardigrades were able to survive 10 days in outer space. Tardigrades can survive more than ten years without water. Tardigrates can survive a few hours in temperatures close to absolute zero and above boiling point
  - phylum of invertebrates of uncertain phylogenetic relationship
  - by far the toughest animals on Earth
  - impressive organisms
  - macroinvertebrates living in and on lichens
  - microscopic, water-dwelling, segmented animals with eight legs
  - minute animals often found on lichens and mosses
  - oviparous , and fertilization is usually external
  - potential extremophiles
  - prey for amoebas, nematodes, and other tardigrades
  - tiny, bear-shaped animals that nestle in damp moss or ponds
* assemblages from an altitudinal transect in Venezuela.
* belong to a remarkable phylum of minute multicellular animals.
* can survive dry periods by curling up into a little ball called a tun
  - for almost a decade without exposure to water
* exhibit a variety of pigmentations.
* express eutely, which means that the number of cells in the body is fixed from birth.
  - the fluids of plant and animal cells
* have a cylindrical shape with four segments , each with two legs
  - barrel-shaped bodies with four pairs of stubby legs
  - two forms of dormancy, namely cryptobiosis and encystment
* is an arthropod
* lack a circulatory system with discrete blood vessels or gas exchange structures.
* live in marine, fresh water, and semiaquatic terrestrial environments.
* occupy a wide range of niches in marine, freshwater and terrestrial environments.
+ Desiccation, Biology, Extreme cases, Tardigrades: Physiology :: Ecology
+ Xerophile: Extremophiles :: Ecology