Arthropods
Published on Nov 21, 2015
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PRESENTATION OUTLINE
An arthropod is an invertebrate animal which has an exoskeleton, a segmented body, and jointed appendages.
The Arachnida also includes a diverse array of smaller groups, including ticks, mites, scorpions, whip scorpions, and many more.
In most cases the male does not transfer sperm directly to the female but rather starts courtship rituals in which the female is forced to accept the sperm capsule...... (Ewww)
Daddy long legs seem to be the most sexual of all spiders.
Growth and development vary.
Photo by NiteLynx
CRUSTACEA
Photo by bob in swamp
All have two pairs of antennae, a pair of mandibles, a pair of compound eyes, followed by a pair of appendages on each body segment.
Most crustaceans are free-living, but some are sessile and a few are even parasitic.
The actual mechanisms by which fertilization is achieved vary greatly.
Photo by hyper7pro
INSECTS
Photo by spettacolopuro
Of the huge numbers of insects, only a tiny amount, one percent, are harmful to humans. Most insects are harmless or actually beneficial.
To grow they have to break the hard exoskeleton before the new skin hardens again.
All insects must have
* Three body parts - a head, thorax and abdomen
* Six jointed legs
* Two antennae to sense the world around them
* An exoskeleton (outside skeleton)
Photo by WilliamMarlow
Centipedes, whose bodies are made up of a chain of many (up to 177) flattened segments, each except the one behind the head and last two have a single pair of legs.
The bite of a large centipede, however, can be painful to an adult and dangerous to a small child.
Fertilization is internal, with sperm is transferred in ways similar to many arachnids. Centipedes lay eggs, When they hatch the young resemble miniature adults.
Photo by satshot2010
millipedes have bodies that are made up of numerous segments. The first four thoracic segments each have a single pair of legs, but the following abdominal segments all have two pairs.
Millipedes don't have poisonous fangs and do not bite; rather, to discourage predators they roll into a defensive ball and many release poisonous or foul-smelling odor.
Female millipedes lay eggs in nests. Newly hatched millipedes usually have only 3 pairs of legs, adding legs and body segments with each molt as they grow.
Photo by berniedup
